BYTNAR - TALKS
EPISODE 027 - APPROVED DOCUMENT L - CONSERVATION OF FUEL AND POWER - VOLUME 1 - DWELLINGS
This episode is for people who want to know more about Approved Document Part L – Conservation of Fuel and Power – Volume 1 – Dwellings.
You should like this episode if you ask yourself questions like:
How do I calculate the Total Energy Performance of a new dwelling using the Standard Assessment Procedure (SAP)?
What are the target primary energy rates and fabric energy efficiency requirements for new dwellings under Approved Document L?
What is the BREL report, and how is it used to compare actual and target energy performance metrics for buildings?
What are the feasibility analysis requirements for implementing high-efficiency alternative systems like renewable energy before construction?
What are the U-value standards for insulation in new and renovated dwellings, and how do they prevent thermal bridging?
What efficiency standards must new and replaced building services meet to comply with energy conservation regulations?
How is pressure testing conducted for new dwellings, and what are the air leakage regulations that need to be met?
What steps are involved in the commissioning of fixed building services and on-site electricity generation systems to ensure energy efficiency?
What documentation, such as the BREL report and energy performance certificate, must be provided to building owners upon completion of new or renovated dwellings?
This is Bytnar Talks the Engineer Takes on Construction Episode 27 hi I'm Piotr Bytnar each day I help my clients plan and design building projects through Bytnar Limited a Consulting Chartered Structural Engineers practice my biggest passion and the cornerstone on which I've built my business is finding clever solutions for construction projects I am a chartered structural engineer and a budding software developer so you can rest assured that I will strive to talk about the best practices and the use of new technologies in the industry and if you're embarking on a construction project or are involved in planning designing and building the world around us you'll find this podcast useful approved document L conservation of fuel and power volume one dwellings hi and welcome to Bytnar talks your favorite podcast on all matters of architecture engineering and construction it is Thursday the 22nd of August 2024 and I'm here back with you with the 27th episode and information on approved document L conservation of fuel and power volume one dwellings I think the the weather is more patchy this year than my deliv delivery of this podcast at least you can tell it will be released once a week well usually but with what is happening outside of the window you damn sure cannot anyway when the weather turns cool I'm all more happier to sit behind the microphone and deliver new content for you especially this one that is rather long and that is why it is delivered at a fortnite since the last one once I got to this I just could not stop and make it in part as I did with approved document b as however before I go to covering the material of this episode let's have a look at what was covered last week in the last episode I talked about the approved document K protection from falling collision and impact there are six requirements covered in this document contained within 10 sections and these section are as follows section one deals with stairs and gings where minimum safety standards dictate the design of stairs concentrating on consistent step geometry proper Riser dimensions and secure handrails different requirements apply to private homes public areas and industrial buildings in section two which deals with ramps and gings we find out that Rams must meet specific gradient and width criteria with mandatory Landings and protective barriers to ensure accessibility and safety especially in non-residential settings section three treats on protection from falling where we are told that guard rails are required in areas with fall risks like stairs and balconies with specified height and strength standards additional safety measures May apply to maintenance areas section four emphasizes vehicle barriers and loading base that IND the should be strong enough to mitigate on vehicle collisions and loading Bays should have safety exit points or refugees to protect workers from Impact from delivery lores section five this with glazing safety where standards for glazing focus on impact resistance and the safe use of different glass types protective buyers may be necessary to prevent injuries section six treats on collision with open windows especially non-residential buildings where barriers or other methods of to prevent people from colliding with open Windows need to be put in place section seven glazing manifestation tells us that large transparent glass in public spaces must be clearly marked at specified Heights to prevent accidental collisions you know those little grayish on semi-transparent dots stripes or whatnot section eight safe operation of Windows simply tells us that windows in non dwellings must have reachable controls and protective measures to safely operate them and prevent falls through open Windows section nine access for window cleaning in non-residential setting the these must ensure safe access for window cleaning including limits on reach and Provisions for safe ladder use in section 10 in doors safety doors are especially in this this in the residential buildings must include safety features like Vision panels and mechanism to prevent injury from sliding or swinging on or falling a chair in this episode I will move to the approved document L conservation of fuel and power volume one dwellings so without further Ado let's dive straight into this [Music] in this episode I will talk about the statutory guidance contained within the approved document L conservation of fuel and power part one or volume one dwellings the requirement L are short and sweet and only two but that is further expanded by 19 different additional regulations including regulation six some regulations from part six of the building regulations are as well as part eight and part nine there will be plenty of talk in this episode so buckle up dor because canas is going bye-bye the episode will follow the structure of the approved document from section zero to section 12 and all the additional regulations along the way as laid down in the document so let's get into the nitty-gritty of this approved document starting with the text of the legislation part L conservation of fuel and power conservation of fuel and power requirement L1 reasonable provision shall be made for the conservation of fuel and Power in buildings by a limited heat gain and losses I through thermal elements in other parts of the building Fabric and two I from pipes ducks and vessels used for space heating space Cooling and hot water services B providing fixed Building Services which I are generally efficient to a reasonable standard double I have effective controls and tripi are commissioned by testing and adjusting as necessary to ensure they use no more fuel and power than is reasonably in the circumstances and requirement L to on-site generation of electricity where a system for Onsite electricity generation is installed a reasonable provision must be made to ensure that I the system and its electrical output appropriately size for the site and available infrastructure double I the system has effective controls and B it must be commissioned by testing and adjusting as necessary to ensure that it produces the maximum electricity that is reasonable in the circumstances okay so these are the paragraphs of the legislation requirements contained within its schule one there will be more regulations popping in as we go along so let's take it slow and methodically as laid down in the approved document section zero gives us a little bit of an introduction to the whole lot you already know that today we talk about dwellings and there will be a second part coming dealing with the buildings other than dwellings we are reminded that dwellings are considered to be self-contained units and if this form Flats we are told that common areas for like heated corridors we need to consider appropriate measures as for the dwelling itself but for unheated space the fabric elements need to meet minimum standards Section 1 to9 deal with new dwellings conservatories in such new dwellings are considered separate if they are not heated and thermally separated separated from the house if not it will need to be considered as part of the dwelling necessi necessi primary energy rate emission rate and fabric efficientcy rate calculations as is the case for the house extension two and work on existing dwellings will follow the consideration of heat gain and losses from section four Building Services consideration in section five and six and new and improved thermal elements in section 10 11 and 12 as however listed and historical buildings will be treated over so ever so slightly differently if we can upgrade a thermal element we ought to but it is recognized it is not prudent to force it on all such buildings conservatory and porch type extensions are also exempt under regulation 21 if the extension is at ground level under 30 m squared the glazing complies with requirements K divided from the building with an appropriate wall door or window and the heating system of the house is not extended into that space car ports and otherwise covered areas are exempt from the regulation if under 30 m squared the work space within a dwelling should be treated as a dwelling if the commercial use can be reverted into a dwelling the approved document L will have some interactions with other documents like part c e f J K and M now a very important part of the whole consideration is the energy performance calculations for the dwellings and these are contained in regulations 24 25 5 25 B 26 26 A and C 27 and 278 as well as 27 C I will now go on to read you the text of them all so you can return back to it whenever you want methodology of calculations of the energy performance regulation 24 point one the Secretary of State shall approve a a methodology of calculations of the energy performance of buildings including methods for calculating asset ratings and operational ratings of buildings and B ways in which the energy performance of buildings as calculated in accordance with the methodology shall be expressed two in this regulation asset rating means an energy performance indicated determined from the amount of energy estimated to meet the different needs associated with a standardized use of the building and operational rating means an energy performance indicator determined from the amount of energy consumed during the occupation of a building over a period of time and the energy demand associated with a typical use of the building over that period regulation 25 minimum energy performance requirements for new dwellings minimum energy performance requirement shall be approved by the Secretary of State calculated and expressed in a ordance with the methodology approved persuant to regulation 24 for a new buildings which shall include new dwellings in the form of Target CO2 emission rates B new dwellings in the form of Target fabric efficiency rates and C new buildings in the form of Target primary energy rates regulation 25b nearly Zer zero energy requirements for new buildings where a building is erected it must be a nearly Zero Energy building regulation 26 CO2 emission rates for new buildings where a building is erected it shall not exceed the target CO2 emission rate for that building that has been approved personent to regulation 25 applying the methodology of calculation and expression of the energy performance of buildings approved persent to regulation 24 fabric Energy Efficiency rate for new dwellings that's regulation 26a where a dwelling is erected it shall not exceed the Target fabric Energy Efficiency rate for the dwelling that has been approved persent to regulation 25 applying the methodology of calculation and expression of the energy performance of buildings approved persent to regulation 24 Target primary energy rates for new buildings that's regulation 26 C where a building is erected it must not exceed the target primary energy rate for the building which has been approved person to regulation 25c applying the methodology of calculation an expression of the energy performance of buildings approved pursuant to regulation 24 CO2 emission rate calculations that's regulation 27.1 this regulation applies where a building is erected and regulation 26 applies point two not later than the day before the work starts the person carry out the work shall give the local Authority and notice which specifies a the target CO2 emission rate for the building calculated and expressed in accordance with the methodology approved personent to regulation 24 B the CO2 emission rate for the building as designed calculated and expressed in accordance with the methodology approved person one to regulation 24 and C a list of specifications to which the building is to be constructed point three not later than 5 days after the work has been completed the person carrying out the work shall give the local Authority a a notice which specifies I the targets your 2 emission rate for the building calculated and expressed in accordance with the methodology approved puru to regulation 24 double ey the CO2 emission rate for the building as constructed calculated and expressed in accordance with the methodology approved personent to regulation 24 and triple whether the buildings has been constructed in accordance with the list of specifications referred to in paragraph 2 C and if not at least of any changes to those specifications or B a certificate of the s s referred to in paragraph 4 accompanied by the information referred to in sub paragraph a point four a local Authority are authorized to accept as evidence that the requirement of Regulation 26 have been satisfied a certificate to that effect by an energy assessor who is accredited to produce energy performance certificates for that category of building and point five in this regulation specifications mean specification used for the calculations of the CO2 emission rate fabric Energy Efficiency rate calculations that's regulation 27A point1 this regulation applies where a dwelling is erected and regular regulation 26a applies point two not later than the day before the work starts the person carrying out the work shall give the local Authority a notice which specifies a the Target fabric Energy Efficiency rate for the dwelling calculated and expressed in accordance with the methodology approved P to regulation 24 B the fabric Energy Efficiency rate for the dwelling as designed calculated and expressed in accordance with the methodology approved personent to regulation 24 and see a list of specifications to which the dwelling is to be constructed point three not later than 5 days after the work has been completed the person carrying out the work shall give the local Authority a a notice which specifies I the Target fabric Energy Efficiency rate for the dwelling calculated and Express in accordance with the methodology approved person one to regulation 24 I the fabric Energy Efficiency rate for the dwelling as constructed calculated and expressed in accordance with the methodology approved personent regulation 24 and triple I whether the dwelling has been constructed in accordance with the list of specifications referred to in paragraph 2C and if not at list of any changes to the specifications or be a certificate of the sort referred to in paragraph 4 accompanied by the information referred to in sub paragraph a point four a local Authority is authorized to accept as that the requirement of Regulation 26a have been satisfied a certificate to that effect by an energy assessor who is accredited to produce energy performance certificates for that category of building and point five in this regulation specifications means specification used for the calculations of the fabric Energy Efficiency rate now off to regulation 27c Target primary primary energy rate calculations for new buildings point one this regulation applies where a building is erected point two not later than the day before the work starts the person carrying out carrying out the work must give the local Authority a notice which specifies a the target primary energy rate for the building calculated and expressed in accordance with the methodology approved person one to regulation 24 B the calculated Target primary energy rate for the building as designed calculated and expressed in accordance with the methodology approved persent to regulation 24 and see the list of specifications to which the building is to be constructed point three not later than 5 days after the work has been completed the person carrying out the work must give the local Authority a a notice which specifies I the target primary energy rate for the building calculate and Express in accordance with the methodology approved personent to regulation 24 double I the calculated Target primary energy rate for the building as constructed calculated and expressed in accordance with the methodology approved personent to regulation 24 and triple I whether the building has been constructed in accordance with the list of specifications referred to in paragraph 2 C and if not list of any changes to those specifications or B a certificate of the sort referred to in paragraph 4 accompanied by the information referred to in sub paragraph a point four a local a local Authority has authorized to accept as evidence that the requirements of Regulation 26 C have been satisfied a certificate to that effect by an energy assessor who is accredited to produce energy performance certificates for that category of building and point five in this regulation specifications me specification used for a calculations of the target primary energy rates so what are these all about you ask in the opinion of the Secretary of State the building is nearly Net Zero Energy building if it meets the target emission rate required by regulation 26 and it is analyzed if alternative high efficiency systems could be used and be feasible for the building analysis in line with regulation 25A regulation 24 four simply tells us that the Secretary of State needs to approve a methodology of assessment and this is wiely known as the standard assessment procedure otherwise known as sap in short regulation 25 requires the Secretary of State to approve minimum targets for primary energy rates emission rates and fabric energy rates and these rates calculations will be needed for the new dwelling in line with the regulation 2626a and 26 C regulation 27 27A and 27 C cover the notific ation of building control the calculation both prior and after the building is built so section one is all about calculating the target primary energy rate target emission rate and Target fabric efficiency rate so-called total energy performance it is done by comparing the calculations of the actual dwelling against so-called notional dwelling before and after the construction a notional dwelling is simply the proposed dwelling in shape and size but with the accepted performance of fabric and services and as such the building needs to hit that minimum in the specification the government set out a standard assessment procedure Sub in short to deal with that requirement the target primary primary energy rate is measured in kilowatt hours per met square a Target emission rate is measured in kilog of CO2 per M Square the Target fabric Energy Efficiency rate is measured in kilowatt hours per me Square the full spec of figures used in sub can be found in the sub appendix are so every new dwelling will need to have these parameters calculated using sub it typically means that thermal fabric opening area should not exceed 25% of the total floor area walls to have a u value of 0.18 watts per M Square per Kelvin except the party wall but this is zero flows are at 0.13 wat per M squ Kelvin roofs at 0.1 wat per M Square Kelvin roof Windows between 1.2 and 1.7 watt per M Square Kelvin depending on an angle of of the roof window windows and doors at 1.2 wat per M Square Kelvin when more than 60% glazed area otherwise 1 watt per M Square Kelvin air permeability at maximum of 5 m cubed per hour per met square at 50 pascals with natural ventilation and intermittent extract funds and thir the minum specifications for heating Source whether a gas heat pump or network network different heating system and Hot Water Systems including heat recovery lighting with maximum total capacity of 15500 85 times the floow area in lumens with efficiency of 80 Lumen per watt at the requirement of for PV systems of at least just just over 6% of the ground floor area in dwellings and similarly for floods only times the number of stories installation facing Southeast to South West all these ratings when taken for a building containing multiple dwellings typically flats and Terrace houses we can do a weighted average of values by simply adding all the targets and dividing them by the sum of all floor floor areas now section two deals with calculations of the actual project dwelling primary energy rate dwelling emission rate and dwelling fabric Energy Efficiency rate all these needs calculation before the project starts and then compare with what has actually been built and in correlation with the air permeability of the building the building control body needs notification on all these rates and how they compare between the Target and design values and what specification has been used in the calculation that can be done using bra report that is building regulation part l l compliance report which is shown in appendix B of the document and the notification needs doing before shovels hit the ground and then again with a B build with the build values and photographic evidence following the construction when the building contains the number of units we can either use each unit value on its own or the average values for all of them the emission value and primary energy rate calculation may be complicated a bit further with a use of additional heating source and the value should be reached by considering the percentage of the input of the two different sources set in that space for heat networks we need to calculate the CO2 and primary energy factor to use in our calculations and the factor will equally apply to Target and designed values and we need to make sure enough heat can be delivered to the house and that the network has the capacity to do it the building control will need evidence of both when connected to a new District hit Network we need to calculate all the heat sources used up to the end of the year 2027 and when there is a change of the heat Source the building control will need to be notified of such and the notification should consist of the planning permission if required and the contract for the new heat Source swimming pools basins do not need to be treated differently and no special consideration for the basins are used the area of the pool should be treated as a flaw with performance as that used for the creation of the pool for the calculation U value for the party walls will be generally Z 0.0 for solid walls and fully filled cavity walls and 02 for sealed and filled cavity walls and 05 for unsealed unfilled cavity walls fixed lighting will have an impact on the calculations of energy and Emissions rates to satisfy the requirements of Target energy rate and emission rate we need to follow the fabric efficiency combined with efficient Building Services integrated with zero carbon Technologies but only fabric efficiency when we deal with fabric Energy Efficiency rate now we are off to regulation 25A that deals with consideration of high efficiency alternative systems let's start with the warning of the legislation consideration of high efficiency alternative systems for new buildings that's regulation 25 A.1 before construction of a new building starts the person who is to carry out the work must analyze and take into account the technical Environmental Al and economic feasibility of using high efficiency alternative systems such as the following systems in the construction if available a the centralized energy Supply systems based on energy from renewable sources B Co generation see District of block heating or cooling particularly where it is based entirely or particularly on energy from renew renewable sources and the heat pumps point two the person carrying out the work must a not later than the beginning of the day before the day on which the work starts give the local Authority a notice which states that the anal analysis referred to in paragraph 1 point I has been undertaken double I is documented and triple I the documentation is available to The Authority for verification purposes and B ensure that a copy of the analysis is available for inspection at all reasonable times upon request by an officer of the local Authority point three an authorized officer of the local Authority may require production of the documentation in order to verify that this regulation has been complied with point four the analysis referred to in paragraph one point a may be carried out for individual buildings or for groups of similar buildings or for common typologies of buildings in the same area and B in so far as is as it relates to Collective hitting and cooling systems may be carried out for all building connected to the system in the same area point five in this regulation a cener cogeneration means simultaneous generation in one process of thermal energy and one or both of the following I electrical energy two mechanical energy B District of block heating or cooling means the distribution of thermal energy in the form of steam hot water or chill liquids from a central source of production through a network of multiple buildings or sites for the use of space or process heating or cooling see energy from renewable sources means energy from renewable nonfossil sources namely wind solar aerothermal geothermal hydrothermal and ocean Energy hydr power biomass landfill gas sewage treatment plant gas and biog gases and D heat pump means a machine at device or installation that transfers heat from natural surroundings such as air water or ground to buildings or industrial applications by reversing the natural flow of heat such that it flows from a lower to a higher temperature for reversible heat pumps it may also move heat from the building to the natural surroundings the secretary of state is happy when we analyze the feasibility of such a system following section three however it is all about reasonable approach there is no expectation of us using solutions that are not feasible at the moment so what does section three say it concentrates on the consideration of high efficiency alternative systems which we need to have and have it documented for the inside of the building control so just saying that you have considered it and it was not feasible will not suffice this also applies to buildings under major Renovations where the technical environmental and economic feasibility of such a system needs to be evaluated now to satisfy the requirement l1a in new buildings we need to prevent the building from Gaining or losing too much heat which will be achieved by addressing building fabric air tightness air tightness pip pork insulation and in case of heat gain by following recommendations of section four in the case of the existing buildings and extensions we need to follow recommendations of section 10 11 and possibly even 12 not make the air tightness air tightness walls and insulate the PIP work section four deals with the limitation of heat gains and losses think your values and think about them in terms of the entire element and the way it is considered in the building research establishment paper BR 443 u values for Windows and Doors can either follow the assis configuration or a standard type as considered by the document or using the HotBox method to BN ISO 125 6 7 glass and glazing Federation documents are also very helpful or use figures from subtable 6E the section gives us the limiting values for new buildings for different elements but truth be told these are lesser than the target values anyway so will really be taken into consideration on the other hand limiting standards in existing dwellings for new and replacement element will be very much appropriate to use for roof that is 0.55 wats per met squ Kelvin for walls and Floors it is 0.18 windows and doors are 1.4 and roof lights are 2.2 in case you are blessed with a swimming pool it is 0.25 for the pool Basin but for renovated and retain elements that is less and it will be different for retained elements and for renovated a renovated element should reach the following 0.16 wats per M Square Kelvin for roofs flaws and at 0.25 cavity Insulation at 0.55 internal external Insulation at 0.3 and retain elements should be upgraded to these values if they are over the threshold limits and these limits are for roofs 0.35 wall insulation a flow at 0.7 naturally this will not always be technically or functionally visible or will lead to a simple payback or in the next 15 years if such is the case we will need to upgrade the element so it does satisfy these tests but that is not less than the threshold value it is important for the insulation to be continuous and ties to avoid unwanted cold spots Bridges or leaks of the Heat and Air carried moisture to achieve this we need to think about the proper specification that needs to be buildable or in the other words achievable on site and once being built it needs to be recorded that it actually is well executed in line with the specified details flaws and Foundations perimeter insulation to be minimum of 25 mm and the insulation on the Dum proof course should be moisture resistant and extend to the foundation windows and doors should be tightly fit in line with BS 8213 and contigous with the insulation layer insulated cavity closers are the way to go in cavity wall construction roof and wall insulation should overlap rigid insulation bols are known to be difficult to fit well so there is a need to be to be a compensatory measure but in place like a compressible table for when the boards are placed in between the rafters and low expansion form in wall cavity any penetrations in the insulation should be addressed by ensuring a tight fit thermal bridging follows similar consideration for the installation in general in terms of quality of the more workmanship specification for Junctions and keeping of the asbu record the emphasis for on the continuity of the insulation or insulation elements like having insulation under the Dum proof course of at least one block high but to overlap with the insulation of the floor and the same principle follows the windows and doors Junctions walls floors party walls and roof Junctions thermal bridging should be assessed to BR 497 to temperature Factor set out in bre information paper 1/06 all we are allowed to to use other established detail like these in the local Authority building controls construction details library but then inspection of the dils on site will be Paramount we can also use the sub values or default values given by the document of 0.2 W per met Square Kelvin when we deal with the existing building there are no special requirements but so but to improve on the existing whenever possible air tightness in new dwelling should meet the minimum stand but care needs to be taken to avoid unnecessary infiltration of cold or hot air the drawing should show the position and extent of continuous air barrier any penetrations and Junctions should be minimized and sealed air tightness air tightness in existing dwelling should be improved whenever possible but care needs to be taken to address ventilation requirements of the entire dwelling as such over tightness may lead to condensation issues and combust heating systems issues limitation of heat losses and gains from Building Services is another consideration of this document the document basically tells us to insulate pipes where the loss of heat is the greatest so where there is a hot water flowing and it flows through unheated spaces and voids hot water pipes and secondary circulation pipes heat losses should not exceed limits the limits put on us in the British standard 5422 for water at 60° the document gives us typical thicknesses of for different pbes between 5 mm for at 10 mm pipe to 20 mm for 100 mm pipe and the size jumps by five every double so 2550 and 100 mm pipes will have 10 15 and 20 mm insulations around them external distri kit Network pipes will also require appropriate insulation according to BN 253 for pre-insulated pipes or conventional equivalent of such and at least as well insulated above ground as it is in ground hot water cylinder needs to perform to Asser a maximum heat loss standards which depends on their size starting at 1.03 kilowatt hour per 24 hours for a 50 L cylinder to 3.57 kilowatt hour per 24 hours for 1,000 L cylinder there is an equ equation to follow if you need to go big similar limits are for heat interface units naturally all type of water storage vessels will need to be up to the code like BS 3198 specification for copper hot water storage combination units for domestic purposes BS 1566 66 part one copper indirect cylinders for domestic purposes open vented copper cylinders requirements and test methods bn1 12897 water supply specification for indirectly heated unvented storage water heats moving on to the provision of energy efficient fixed Building Services with efficient controls the secretary of state is considered satisfied if the system meets minimum standards is appropriately sized and has controls for hot water and heat onsite electricity generation should also be pre properly sized and controllable now section five deals with General guidance for the minimum Building Services efficiencies and controls we are told that every new fixed building service needs to meet the minimum standard set in section six for a given system Services outside section six should be treated in a comparable fashion with the one within the efficiency the efficiency needs to be tested and certified by a notified body when we replace service in the existing house we need to mind section six efficiency but otherwise provide service that is not lesser than the existing in terms of efficiency when exchanging like for like in terms of fuel CO2 emissions and primary energy demand per kilowatt hours when changing the fuel type there are some leeway on this provision for example when we change to the heat pump of approved standard or when we deal with a fuel change in a building that loses less than 25 KW hour per M Square per year renewable heat sources should be changed like for like like in terms of performance and building should be ready to connect to a heat Network the proper sizing of the of the heating a hot water system should take in consideration the heat loss calculation for the dwelling and sizing methodology that accounts for the buildings properties the approved document preference The chared Institute of plumbing and heating engineering Plumbing Engineering Services design guide for this purpose Combi boilers should be able to modulate down their heat output to the level generally required by the dwelling new wet heating systems need to be sized to meet the requirement of low temperature heatings of flow temperatures at 55° C maximum that is also applicable to entirely new system in existing dwellings this will not always be feasible and whenever it is not we need to size the system so it turns at the minimum that becomes feasible domestic hot water system should be sized in line with the need of the building and can follow bn1 12831 part 3 standards or the plumbing Engineering Services design guide and the system should not be significantly oversized heat pumps should be specified so they meet the needs of the dwelling without relying on additional electric heat being supplied to the system likewise the reversible heat pipe should be optimized for heating rather than cooling Now controls of the system we should consider splitting wet heating system system for new dwellings over 150 M Square the system should switch off automatically if not in use hot water storage supplied system should have electric temperature control and a Time control that is independent of space heating circuits hot water circuit should have fully pumped circulation when it is compatible with the heat generator space heating should have temperature control for the heating Appliance and wet heating system should ensure minimum flow of water to avoid short sight CLE thermostatic room control should be fitted in every room unless this is prudent to do otherwise or not feasible the Secretary of State thinks it is prudent when at least 70% of the zone is an open plan living space or in a group of two adjacent similar us rooms are considered we may satisfy the requirement of control by either thinking about the thermostatic control over each heat emitter things like thermostatic rator valve thermostat in the room served by the given circuit but do not provide both at the same time thermostat for individual rooms or heating zones or individual Network heit emitter control for each emiter when it comes to the control of the existing Heating and Hot Water Systems it should follow the previous considerations but if in the existing state both water and heating are controlled together this may continue the boiler interlock should be introduced if there is work done to the system with a boiler hot water cylinders if replace should have an electronic temperature control and the new boiler should have boiler controls in line with Section 6 expectations now what is hiding in section six in this section we come to find out more details about the expected performance of the systems installed in the dwellings including for the energy generation the document points us also to the echo design for energy related products regulation 2010 in case this is Al this also applies to our new system the document gives us the minimum standards but it may be the case that this minimum will need to be made better when considering the dwelling holistically starting with gas fired heating systems in new dwellings the wet heating should be at least 92% efficient to Erp efficient but in the existing buildings this becomes convoluted and will be generally different for different types of heaters so wet Heating remains at 92% efficiency to urp rating but maybe as low as 78% to sedbuk 2009 so we got two ways of measuring efficiencies either to Erp and or either to set book are the ways to measure these are the ways to measure Erp stand for energy related products directive whereas SB k said book stands for seasonal efficiency of domestic boilers UK the data for all the other types of heaters can be read from the table in the document and it includes for warm air heating intended space heating applications and in satell life fuel effects heaters there are also other as aspects to consider such like if we install a Combi boiler in the existing dwelling we should make it operation a bit more effective by either recovering the flu gas heat making it measure the external weather and compensate for it with its load or simly compensating for the load in the system depending on the actual requirement of the dwelling but I think the simplest one of them are a simply smart thermostats I personally have not seen one of these but should you consider replacing or putting a new Range cooker with an integrated gas boiler the cooking and heating burners should be separate either gas fired warmer systems or independent heating appliances should be controllable and automatically adjustable to the temperature of the space they serve these appliances should meet appropriate standards like bsn1 12666 independent gas fired convection heaters incorporating a fund to assist transportation of combustion air and or flu gases BS 7977 specification for safety and rational use of energy of radiant convective b613 independent closed fronted gas fire type b11 type C11 type c31 and type c91 hitters BN 13278 open fronted gas fight independent space hitters BN 14829 independent gas fire flueless space heers for nominal heat input not exceeding 6 KW BSN 449 specification for dedicated liquified petroleum gas appliances domestic flueless space heaters including diffusive diffusive catalytic combustion heaters NBS 509 decorative fuel effect Gas Appliances interestingly we are not allowed to have more than one gas fire fix decorative effect fire per 100 m squ installed in our dwellings now after to oil fired heating systems the requirement are similar to that of gas heating system we again deal with effic icies either to Erp or set book that are set within the document like for wet heating for regular boilers being 91 Erp or 84 set book and so on electric space heating system these are considered 100% efficient so no limits are given for electric storage hitters we need to be able to control the input charge as well as the heat release electric panel heaters or electric warm air systems also need control for each room or the appliance but check the requirements of section five to not go too crazy on the amount of control solid fuel hitting systems these are by category designation and accordingly should have minimum efficiency measured in calorific value appliances forming part of the central heating system delivering primary heat belonging to either category D1 to 4 F G2 G J2 or J5 should meet the requirements of section five have separate time controls for space Heating and hot water circuits have automatic control of the burning rate and have fact required heat lak radiator installed an appliance that is part of the central heating system should be one of the DFG OJ categories and have the ratio of room heat to water heat set to be satisfactory to meet the needs of the property District heat networks and Community heating systems the consideration of this part are for distribution networks of at least 15 dwellings that's with a central heat Source whatever that may be boiler combine Heats and power unit or heat pumps but whatever it is if it is a new District heat Network it needs to comply with Section six of the approved document L volume two dealing with buildings other than dwellings now if we can connect the existing Network depending if it's a new dwelling or an existing one we will face different limits limits so for the newwell dwelling the emission factor for delivered heat should be under 0.35 kg per CO2 per kilowatt hour you can get the value either from sub calculation or the product characteristic database the value should be the same as used in the calculation for the dwelling emission rate connecting the existing dwelling will usually mean changing the fuel source so the appropriate paragraph of section five should be followed but in the gist it should improve the circumstance of the dwelling to be approved the emission Factor primary energy factor for the house need to be established the pumps of the system should have variable volume control to adjust to the requirement of the system and appropriate temperature difference for the primary heating Circuit of at least 20° C for fuel heated networks heat pump Network may work at lower differences dwelling input should be controlled with balancing valves and controlling maximum flow rate into the building wet heating system and by and by using the variable volume controls for the hot water system all the heat exchange should be measured by appropriate meter for each dwelling now of to micro combined heat and power called micro chps it is important to ensure the micro CHP heating emission rate is not greater than that of the regular boiler using the same fuel as CHP the emission rate should be established using defra method or to evaluate the annual energy performance of micro generation heating systems in dwellings BSI pass 60 67 together with the plant size ratio for the temperature difference of 24.2 CRA measured heat output over heat loss of the building consideration for under floor heating system are as follows it should have temperature adjustable zones if the system is electric the room thermostat should have a manual override heating systems of force crats greater than 65 mm thick should automatically reduce heating at night or when the room is not used and the heat loss should be minimized in such Sy to minimize the heat losses the flow should be insulated to limit the heat loss to not more than 10 WS per M Square calculated by taking the U value of the Flor times 10 we need to provide a separation between the heating system and the structure of the flo for at least 1.25 M Square Kelvin per watt of resistance to 1.25 R value for systems intended for intermittent or cylic operation and all installed over unheated rooms to reduce downward heat transfer and in intermediate flaws the layer of insulation should be at least 10 wat per met square or U value of 0.5 for electric systems or 0.75 for wet system distribution power should be installed insulated to the standards of section 4 for electric underflow heating systems up to 60 mm sticks creats uh the direct system and the night storeage systems are the ones with scre 65 mm and over if the night store system is installed we need to have a quick way of hitting the house and this should be able to hit at least 20% of the floor area of the dwelling and have control of the room therat and floor temperature sensing in any case a programmable thermostat with an override feature and floor sensing should be in place for the control of the operation of the Electric System heat pump heating systems as you know heat pumps can be used for heating but also for cooling and the cooling provision will follow later on for heating though they need to have certain efficiencies and these are a minimum of three for heating and two for hot water so they should be able to multiply the energy input of the system if the system is small enough under 22 kilow the regulations for ecodesign commission number 20116 2281 will apply as however being an appliance heat pump will fall under the provision of section five considerations but also we should be able to control the water pump air or water temperature fun operation the frosting of the heat exchanger secondary heating if fitted and have protect protection from water and air flow failure high water of refrigerant temperature we should be able to control this operation with a timer or programmer for space Heating and have weather comp compensation or internal temperature control fitted if heat pumps are provided in addition to other heat sources they all they all should be incorporated into one control system the legislature reminds us about the placement of the heat pump and the importance of reading the manufacturers instructions the most Troublesome aspect of the wrong placement will be the falling effectiveness of the pump problems with the recirculation of cold exhaust air and removal of condensation from the outer coold during the frosting uses from the use noise and vibration can also be a problem so we need to think about this where to be placed and how to mitigate it and we will also be bound by planning regulation on this front solar Heats solar water heating systems the document consider system where the solar collectors is less than 20 M squared which supplies a storage tank of not more than 440 L the system needs to be tested to bn1 12975 part one and BN is 9806 for thermal performance and documentation the pump for The Collector should be less than 50 wats or 2% of the peak thermal power of the collector the ratio for the heat exchange and area and the absorber should be 10 the system should be controlled so that the use of solar power is maximized and used first before boosting by other hit sources as well as to mitigate on adverse effects of excessive temperatures and pressures the hot water storage vessel should be at least either 25 M Square for every 1 M square of the net absorber area or 80% of the daily hot water need for the dwelling Comfort cooling the cooling system should be based on the heat gain calculations for the dwelling and not be over 120% of the cooling load we can calculate the load using cibse BSE guide a and the manufacturer data the seasonal Energy Efficiency ratio of the unit should be four or more control for the timing and temperature should be provided for each control Zone and terminal unit and if the heating is provided for the room they should be prevented from working simultaneously the refrigeration P pork should be insulated and in protective truning cooling systems serving more than one dwelling should follow the recommendations of volume two of this document now mechanical ventilation we heard this one before when we discussed the ventilation requirements for the dwellings so know how to ventilate already but now we cannot use too much energy to achieve it so we have for so we are faced with efficiencies here also units extracting the area intermittently or continuously should have an effect efficiency of 0.5 wat per liter per second and 0.7 wat per liter per second continuous Supply should be at 0.5 watts per lit per second and combination of extraction and Supply should have have heat recovery system system for at least 73% efficiency but bypassable and controllable during summertime and using no more than 1.5 wats per liter per second lighting the space should not be overly illuminated but you will buy your own light bulb once you the efficiency of the lamp should be at 75 lumens per watt lamps should be functional for the space or Zone and controllable external lighting will need to be automatic for people and they that if the efficiency is wor than 75 Lums per watt otherwise manual control is fine building Automotion and control systems the document does not really go into too much detail apart from requiring to be proper and if the building is large and complex the volume two consideration may be put in place when it comes to onsite electricity generation and storage it needs to be sized properly for the site and demand follow manufacturing instructions if replacing an existing system the efficiency or capacity should be as that existing unless the dwellings need to be need needs can be satisfied the system should control itself automatically so off to section seven which deals with the requirements of Regulation 43 pressure testing let us start with the text of the legislation pressure testing regulation 43.1 this regulation applies to the erection of a building in relation to which paragraph L1 AI of schedule 1 imposes a requirement point two where the regulation applies the person carrying out the work shall for the purpose of the ensuring compliance with the regulation 26 and Regulation 26a and paragraph L1 AI of schedule one a ensure that I pressure testing is carried out in such circumstance as are approved by Secretary of State and double I that testing is carried out in accordance with a procedure approved by the Secretary of State and B subject to paragraph 5 give notice of the results of the testing to the local Authority point three the notice referred to in paragraph 2B shall a record the results and the data upon which they are based in the manner approved by the Secretary of State and B be given to the local Authority not later than 7 days after the final test is carried out point four a local Authority are authorized to accept as evidence that the requirements of paragraph 2 AI have been satisfied a certificate to that effect by a person who is registered by elhurst Energy Systems limited or the air tightness testing and measurement Association in respect of pressure testing for the air tightness of buildings end point five where such a certificate contains the information required by paragraph 3A paragraph 2B does not apply the secretary of state is happy if the dwelling passes the pressure test as described further in this section the test should be done on each and every dwelling the maximum rate of air leakage limit at 50 pascals needs to be established using proper properly calibrated equipment by a trained and registered individual the building control will require proof of the test certification calibration and individual credentials the energy rate dwelling emission rate and fabric Energy Efficiency rate should be recalculated using the test results to check if this meets the target the report on test attempts should be included in the building control submission so the failures go in as well the test should be done to cm23 testing buildings for air leakage now Section 8 deals with commissioning and regul regulations 44 and 44 zaa starting with the legislation regulation 44 commissioning point1 this regulation applies to building work in relation to which paragraph f1.2 of schedule one imposes a requirement but does not apply to provision or extension of any fixed system for mechanical ventilation or any Associated controls where testing and adjustment is not possible point two this regulation applies to building work in relation to which paragraph l1b of schedule one imposes a requirement but does not apply to the provision or extension of any fixed building service where testing and adjustment is not possible or would not affect the Energy Efficiency of that fixed building service point three where this regulation applies the person carrying out the workshell for the purpose of ensuring compliance with paragraph F12 or l1b of schedule one give the local Authority a notice confirming that the fixed Building Services have been commissioned in accordance with a procedure approved by the Secretary of State point four the notice shall be given to the local Authority a not later than the date on which the notice required by regulation 16.4 is required to be given or B where that regulation does not apply not more than 30 days after completion of the Work Commission in respect of a system for on-site electricity generation that's regulation 44s a day point one this regulation applies to building work in respect of a building in relation to which paragraph L2 of schedule one imposes a requirement but does not apply to the provision or or extension of any system for on-site elect electricity generation where testing and adjustment is not possible point two where this regulation applies the person carrying out the work must for the purpose of ensuring compliance with paragraph L2 of schedule one give to the local Authority a notice confirming that the system for Onsite electricity generation has been commissioned point three the notice must be given to the local Authority a not later than the date on which the notice required by regulation 16.4 is required to be given or B where that regulation does not apply not more more than 30 days after completion of the work in the G fixed Building Services need to be commissioned to assure the operation is good and proper this involves the formation of commissioning plan that identifies what is being tested and how and what does not require testing and why it forms part of your submission to building control notice of completion will generally follow the 5-day requirement upon completion but could be up to 30 days when done by a personal resisted in the competent person scheme it will need to include confirmation of following the proper procedures including the commissioning plan and giv Assurance of reasonable performance it is rather pertinent to have that notice done as building control May withheld the completion certificate until it is now going system by System hot water system should be prepared and commissioned to BS 7593 the system should be cleaned and flushed out include chemical inhibit Inhibitors in the primary heating circuit to protect against scale and corrosion in hard water areas we may need to treat the water to maintain the system heat pumps should be commissioned to manufacturer specs and systems design parameters ground arrays should be flushed and purged to get rid of De Bri and air that that flushing should be separate to the heat pump system which will require the same in isolation from the AR cleaning and purging should be followed by a pressure test to BN 805 antifreeze and biocide should be added to the heat exchanges as appropriate commissioning information needs to be provided to the dwelling owner and should include the details of the fluid and its commissioned concentration for Community heating system there should be commissioned to optimize the use of energy for pumping and the flow rates individual heat emitter should be balanced either using calibrated control valves or appropriate return temperature under heating commissioning should be done to bn1 1264 part 4 section N9 covers the necessity of providing information about the system including in regulation 40 and 40a starting with the text of the legislation information about the use of fuel and power regulation 40 point one this regulation applies where paragraph L1 of schedule one imposes a requirement in relation to building work point two the person carrying out the work shall not later than 5 days after the work has been completed provide to the owner sufficient information about the building the fixed Building Services and their maintenance requirements so that the building can be operated in such a manner as to use no more fuel and power than is reasonably in the circumstances requirement 40a information about assistance for on-site generation of electricity point1 this regulation applies to building work in respect of a building in relations to which paragraph L2 of schedule one applies point two the person carrying out the work must not later than 5 days after the work has been completed provide to the owner sufficient information about the system for onside electricity generation in respect of its operation and maintenance requirements so that the system may be operated and maintained in such a manner as to produce the maximum electricity that is reasonable in the circumstances and delivers the electricity to the optimal place for use in the G the owner needs to know how to operate and maintain the system and what work has been done the operating and maintenance instruction should be easy to understand site specific detailed and accessible they should describe the system with it location on the floor plan identify components and explain their function how to operate and maintain them direct us to important documents and include commissioning sheets where relevant in addition new buildings should have an accompanying bra Report with photographic evidence of the build quality and all the ASU energy pertinent data as well as the energy performance certificate together with recommendations home user guide should accompany new dwellings and contain Provisions for ventilation Heating and domestic hot water onsite electricity generation staying cool in hot weather in exist in buildings if section five and or six apply the installation or the fixed building service should be energy performance assessed and documented when it is the whole system we will comply by either providing the full record of commissioning to Section 8 requirements or the sub assessment EPC certificate or similar however if work on the existing system Alters energy performance or CO2 emissions of the system work like changing heating fuel or increasing the the system capacity by 25% section 10 deals with the elements in existing dwellings including extensions in addition to the requirement L we need to also consider regulation 23.2 and the text of which is requirements for the renovation or replacement of thermal elements requirement 23.2 where the whole or any part of an individual thermal element is proposed to be replaced and the replacement a constitutes a major renovation or B in the case of part replacement amounts to be placement of more than 50% of the thermal element surface area the whole of the thermal element must must be replaced so as to ensure that it complies with paragraph L1 AI of schedule one in so far as that is technically functionally and economically feasible in the G the building fabric will need to satisfy the performance given in table 4.2 for all new and replaced elements the opening areas in the fabric of the building should be kept within the 25th 25% of the floor area limit unless some compensation measures are being introduced to increase the over overall Energy Efficiency of the dwelling windows and doors May satisfy the performance with appropriate certificates and will fall under the consideration when the work applies to the controlled fitting meaning including the frame of the element when such control fitting is changed we also need to think about draft proofing and installing cavity closes should that be appropriate for extensions similar expectations are put and following table 4.2 for new and replacement elements and table 4.3 for adopting the existing should should be our first point of check the total area of openings in such extended spaces is again 25% plus all the openings that no longer exist due to the creation of the extension fixed services and the extension should as however follow section five and six requirements the openings can also be justified by comparing the area weighted U value of the one that follows the 25% plus existing opening consideration simply add all elements areas times their U value and divide them by the sum of all these areas and compare the results or we can also use sub calculations for the entire building plus the notional extension when it comes to conservatories and porches these may be treated separately from the dwelling if they are separated separated by the thermal elements from it and the heating system is not extended to them if they're not excluded from the Energy Efficiency requirements due to exceeding a certain size and location should should have thermal elements of sufficient performance and separated separate control of the services within there is no limit on amount of glazing for such conservatories and porches now regulation 6 regulation 22 and 23.1 deal with material change of views and change to energy status starting with the and let's start with the text of legislation so the regulation six requirements relating to material change of use point one where there is a material change of use of the Hall of a building such work if any shall be carried out as is necessary to ensure that the building complies with the applicable requirements of the following paragraphs of schedule one a in all cases B1 means of warning and Escape B2 internal fire spread Linings B3 internal fir spread structure B4 point2 external fir spread roofs B5 access and facilities for the fire service C2C interstitial and surface condensation F1 V ventilation G1 cold water supply g3.1 123 hot water supply and systems G4 sanitary conveniences and washing facilities G5 bathrooms G6 kitchens and food preparation areas H1 fuel water drainage foul water drainage H6 Solid Waste storage J1 to j4 combustion appliances L1 conservation of fuel and power P1 electrical safety S2 infrastructure for the charging of electric vehicles B in the case of a material change of use described in regulation 5 C D E or F A1 to A3 structure C in the case of building exceeding 15 m in height B before One external fire spread walls D in the case of a material change of use described in regulation 5 a b c d g h I or where the material change provides new residential accommodation f1.2 resistance to contaminants e in the case of a material change of use described in regulation 5 a c C2 resistance to moisture F in the case of material change of use described in regulation 5 a b c g h or I E1 to E3 resistance to the passage of sound G in the case of material change of use described in regation 5e where the public building consists of a contain of or contains a school E4 acoustic conditions in schools H in the case of a material change of views described in regulation 5 A or B G2 water efficiency and G3 point4 hot water supply and systems hot water supply to fix Buffs I in the case of a material change of use described in regulation 5 CD e or J M1 access to and use of buildings or and dwelling J in the case of material change of views described in regulation 5 a b o g q1 security two where there is a material change of use of part only of a building such work if any shall be carried out as is necessary to ensure that a that part complies in all cases with any applicable requirements referred to in paragraph 1 a b in in a case in which sub paragraph B EF g o h or paragraph one apply that part that part complies with the requirements referred to in the relevant sub paragraph C in a case to which sub paragraph C of paragraph one applies the whole building complies with the requirement referred to in that sub paragraph D in a case to which sub paragraph I of paragraph one applies I that part and any sanitary conveniences provided in or in connection with the part comply with the requirements referred to in that sub paragraph and double I the building complies with requirement M1 a a of schedule one to the extent that reasonably Pro with reasonable provision and reasonable provision is made to provide either suitable independent access to the part of or suitable access through the building to that part e in a case to which sub paragraph J applies in respect of material change of use described in regulation 5B OG that part complies with the requirement refer to in that sub paragraph point three subject to paragraph four where there is a material change of views described in regulation 5K such work event it shall be carried out as it's necessary to ensure that any external wall or specified attachment of the building only only contains material of European classification A2 S1 d0 or A1 full stop classified in accordance with BN 13501 part 1 2007 plus appendix 1 2009 entitled fire classification of Construction Products and building elements classific application using test data from reactions to fire test ISBN 9780 585 98616 published by the British standard institution on 30th March 2007 and amended in November 2009 point four paragraph 3 does not apply to the items listed in regulation 7.3 now off to requirement 22 relating to a change to energy stat status where there is a change to a building energy status such work event shall be carried out as in as is necessary to ensure that the building complies with the applicable requirement of part L of schedule one and requirement 23.1 where the renovation of an individual thermal element a constitutes a major renovation or B amounts to the renovation of more than 50% of the element surface area the renovation must be carried out so as to ensure that the whole of the element complies with paragraph L1 AI of schedule one in so far as that is technically functionally and economically feasible secretary of state is satisfied the requirement 622 and 231 are met if we follow the recommendation of section 11 and section 11 11 covers work to elements of existing dwellings work understood as renovation of an existing thermal element material change of use and change to energy status the consideration does not follow new and replacement elements that was covered in section 10 so what is considered renovation it is providing an additional layer in the buildup of the elements so cladding rendering or dry lining and replacement of the layer by stripping down to structural components replacing waterproof membrane on a flat roof providing cavity wall insulation this however follows limits of impact so so to exclude minor maintenance jobs the limits are as follows 50% of the surface of the individual element is renovated so a wall a roof or a floor or 25% of the surface area of the external building envelop is renovated all elements combined if our work falls under any of these two we will need to upgrade the whole of the renovated element in line with table 4.3 of the document and table C1 in appendix C now we consider material change of use if we turn buildings into dwellings or flats or change the number of dwellings and we consider the change to energy status when the space is turned into space which falls under Energy Efficiency requirements so when we change the space we need to think about the limiting factors for thermal Elements which were previously discussed and are contained within section four if the opening thermal elements are between external unconditioned spaces they need to be accessed and assessed and if they exceed the U value limits they will need to be replaced the limits are 3.8 W per met Square Kelvin for roof lights and 3.3 watts per met Square Kelvin otherwis in addition to following section four recommendations we need to consider openings to be no more than 25% of the floor area and services and their control to section five and six recommendations alternatively if the building contains more than one dwelling we can use sub procedure to establish the dwelling primary energy use and total CO2 emissions from all dwellings and it may be better than simply following the previous guidance that leads us to regulation 28 in legislation it says consequential improvements to energy performance regulation 28 point1 paragraph 2 applies to an existing building with a total useful floor area over 1,000 M Square where the proposed building work consists of or includes an extension the ini provision of any fixed Building Services or an increase to the installed capacity of any fixed Building Services point two subject to paragraph three where this paragraph applies such work event it shall be carried out as is necessary to ensure that the building complies with the requirements of part L of schedule one and point three nothing in paragraph 2 requires work to be carried out if it is not technically functionally or economically feasible and that's covered in section 12 it deals with consequential Improvement of large dwellings of over 1,000 M squared of useful floor area or what is otherwise also called gross floor area we are basically told that we may need to upgrade the overall Energy Efficiency of the dwelling if we extend it provide fixed building service for the first time or increase the capacity of any fixed building service and this does not include renewable energy naturally this Improvement need to be technically functional and economically feasible for technical guidance we are sent to the volume two of this approved document which will be covered in the next [Music] episode so this is it folks the approved document L conserve ation of fuel and power volume one dwellings let's sum it up section by section so section one outlines the process of calculating the total energy performance for new dwellings by comparing them to a notional dwelling using the standard assessment procedure procedure sub key metrics include the target primary primary energy rate target emission rate and Target fabric Energy Efficiency rate with specific requirements for thermal fabric ventilation heating systems and lighting for building with multiple dwellings these targets are average based on floor areas section two covers the calculation of actual energy performance metrics for a dwelling including primary energy rate emission rate and fabric Energy Efficiency rate which must be compared against Target values these calculations required before and after construction are documented in Braille report and submitted to building control including any adjustments for additional heating source or heat networks special considerations include u values for different wall types and the impact of fixed lighting with a focus on integrating fabric efficiency and low carbon Technologies to meet energy and emission targets section three says that before starting construction on new buildings and Analysis of the feasibility of using high efficiency alternative system such as renewable energy Coen cogeneration District heating or Cooling and heat pumps must be conducted documented and submitted to the local Authority this analysis which may must be available for inspector applies to individual or groups of buildings and includes both new constructions and major Renovations the key requirement is a document is is documented and reasonably and reasonable consideration of these systems should be there regard regardless of whether they are ultimately implemented or or not section four outlines the limitation on heat gains and losses in buildings emphasizing new values for various elements walls roof floors windows and doors and the importance of continuous insulation to prevent thermal bridging it specifies minimum u values for new and existing dwellings with stricter standards for renovated and retained elements and requires that air tightness and proper insulation be maintained to meet Energy Efficiency standards section five mandates that all new and replace Building Services meet minimum efficiency standards and be appropriately sized with a focus on low temperature heating systems and controls to prevent energy waste the system should be designated to match the specific Heating and hot water needs of the building with controls such as thermostats and timers to optimize performance in existing buildings efficiency upgrades should adhere to these standards ensuring that heating and hot water systems are not over and are equipped with proper controls to enhance Energy Efficiency section six outlines detailed performance standards for various heating cooling ventilation and energy generation systems in dwellings it emphasizes the need for high efficiency in new and existing systems with specific requirements for gas oil electric and soil solid fuel heating as well as heat pumps solar waste heating Sol solar water heating and comfort Cooling each system must meet or exceed minimum efficiency standards be appropriately controlled and be sized according to the dwelling needs Additionally the section covers consideration for district heating underflo heating mechanical ventilation lighting and onsite electricity generation ensuring all systems operate efficiently and effectively within the building's overall energy framework section seven mandates pressure testing for all new dwellings and show compliance with regulations on energy performance specifically limiting air leakage test must be conducted by certified professionals using calibrated equipment with results submitted to building control within 7 Days compliance is confirmed through recalculating energy emission and fabric efficiency rates based on the test outcomes Section 8 mandates the commissioning of fixed Building Services and on-site electricity generation system systems to ensure proper operation and compliance with regulations a commissioning plan detailing the test procedure must be submitted to building control with a notice confirming completion required within up to 30 days specific systems like hot water heat pumps Community Heating and under floor heating must adhere to these designated standards and procedures including system cleaning flashing and appropriate chemical treatments section nine requires that within 5 days of completing building work the owner must be provided with clear detailed information about the operation and maintenance of the building's fixed services and any onside electricity generation systems this information must be included must include system descriptions maintenance instructions and commissioning details with new buildings also requiring requiring a bra report and energy performance certificate for existing buildings any significant significant change changes affecting energy performance performance or CO2 emissions must be documented and assessed according to relevant standards section 10 mandates that any new or replacement thermal element in existing dwellings must meet performance standards outlin in table 4.2 with major renovation or replacement over 50% of an elements surface area requiring full compliance with these standards as far as technically and economically feasible extension must adhere to similar performance criteria and ensure that the total area of openings does not exceed 25% of the total floor area with specific attention to fixed services and their extensions conservatories and porches can be treated separately if they have their own thermal elements and controls but must still meet performance requirements if they are integrated into the main dwelling section 11 when a building under goes the material change of use renovation or energy status change it must comply with applicable requirements of schedule one including Energy Efficiency and thermal performance stand standards major renovation or Replacements of over 50% of thermal element surface area must meet updated performance criteria additionally for energy status changes compliance with part L requirements is necessary and in case of multiple dwellings sub procedures may be used to assess overall energy use and CO2 emissions section 12 for existing buildings over 1,000 M squared any work involving extensions new fixed Building Services or increases in service capacity must ensure compliance with part L requirements provided it is technically functionally and economically feasible this rule does not apply to renewable energy installations further technical guidance is detailed in volume two of the approved document in the next episode we will move to approv document L conservation of fuel and power Volume 2 buildings other than [Music] dwellings I hope you enjoyed this episode and that the considerations of the approved document L conservation of fuel and power volume one dwellings are clear for you now if you have any questions reach out to me on LinkedIn or or send me an email I'm more than happy to help you out in bitna we deal with planning designing and managing of your projects and we are always glad to facilitate a free initial consultation to steer you in the right direction visit www.bar.ca.gov what should I do we will be able to give you a piece of non obligatory advice at bitna we help our clients design and execute their dream homes or Investments if your building is falling apart we can also help investigate the reasons behind it and to provide you with an appropriate strategy design and specifications for the repair thank you again for listening please voice up your opinions I'm waiting for you on LinkedIn and I want to hear from you see you next week Bytnar Designs The World Around You, Toodloo!
Piotr Bytnar BEng (Hons) MSc CEng MIStructE
Chartered Structural Engineer who deals with the Architecture of buildings. His Master's Studies led him to an in-depth understanding of risk and contract arrangements in construction as well as specialist knowledge in soil mechanics.
He and his team help homeowners and property developers to design and deliver construction projects reducing waste in time and the cost. He believes that the construction project is an iterative process that can be well managed and it is best managed if all the aspects of the project definition and management are dealt with in-house or coordinated by one organisation. His team works to all stages of RIBA and ISTRUCTE stages of work and enables contractors to deliver projects on-site providing risk evaluations, methodologies for execution of works and temporary works designs.
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