BYTNAR - TALKS
EPISODE 021 - APPROVED DOCUMENTS D AND E - TOXIC SUBSTANCES AND RESISTANCE TO THE PASSAGE OF SOUND
This episode is for people who want to know more about Approved Document Part D and E – Toxic Substances and Resistance to the Passage of Sound.
You should like this episode if you ask yourself questions like:
What does Requirement D1 of Approved Document D say about cavity insulation and indoor air quality?
How can insulation materials impact indoor air pollution, and what are the safety guidelines?
What are the key sound insulation requirements in Approved Document E?
How does Requirement E1 address sound resistance between adjoining buildings and parts of a building?
What are the standards for reducing sound transmission within a dwelling house according to Requirement E2?
How do you prevent excessive reverberation in common areas like corridors and stairwells in residential buildings (Requirement E3)?
What acoustic conditions must be met in schools under Requirement E4, and where can I find the specific standards?
What is Regulation 41, and when is sound insulation testing required for new buildings?
How do Robust Details Ltd-approved methods provide exemptions from sound insulation testing requirements?
This is Bytnar Talks the Engineer Takes on Construction Episode 21 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 corner stone on which I've built my business is finding clever solutions for construction projects I am a chartered structural engineer and a bing 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 approv document D and E toxic substances and resistance to the passage of sound hi and welcome to bitnar talks your favorite podcast on all matters of architecture engineering and construction it is Thursday the 20th of June 2024 and I'm here back with you with the 21st episode and information on approved document d and e toxic substances and resistance to the passage of sound last week I covered aspects concerning the approved document C site preparation and resistance to contaminants and moisture I thought we start this episode as ever with some recap points from that episodes and these are number one designers and contractors must ensure adherence to building regulations especially in flood proud prone zones or contaminated areas I'm story I didn't know will not work here anymore there are other relevant legislation that needs to be looked at and these are the contaminant land England regulation 2006 and the Environmental Protection act 19903 building sites must be free from harmful material to avoid health and safety hazards from contaminants like corrosives explosives radioactive materials or toxic substances structural Integrity is important so building walls floors and roofs must be protected against ground moisture precipitation and condensation sites need to be evaluated through planning desk studies walk over surveys sampling and testing F the guidance is provided in bread digest and nhbc Publications for impact assessments and Remediation Solutions common contaminants are like asers Raiden sulfates biodegradable waste pesticides and hydrocarbons risk assessment procedures involve preliminary risk assessment going to generic quantitative risk assessment and then if need be the detailed quantitative risk assessment contamination management options include treatment containment or removal and the guidance can be found in Syria or nhbc or the eni environmental agency Publications subsol drainage may be present on site or may be required to direct ground may be required we may need to put some pipes in the ground to direct that ground water away from the building and services flaws must prevent ground moisture transfer condensation and typically include a vapor barer insulation and a dump proof membrane in the buildup ground bearing slaps should be at least 100 mm thick with appropriate Dum proof membranes suspended floors need ventilation and isolation from the ground moisture walls must prevent moisture Ingress and mitigate condensation roofs must meet similar standards as walls and Floors to prevent moisture and condensation these points are a general guidelines that ensure the building buildings are safe resistance to contaminants and moisture thereby protecting the structure services and most importantly the occupants in these episode I will move to the approved document d and e and the consideration for the cavity installation and sound proofing so without further Ado let's dive into the text of the approved document D and [Music] e in this episode I'll talk about the stat state tree guidance contained within the approved document DN toxic substances and resistance to the passage of sound the approved document D is fairly short and sweet and mainly concerns the use of UA for malite foam cavity insulation and the document e gives us a prescription of buildups and procedures to assure sound insulation and dumping of reverberation so let's not F about and start the listening [Music] bout as we'll be starting with the text of the of the actual requirement so approve document detoxed substances requirement D1 cavity insulation if insulating material is inserted into a cavity in a cavity wall reasonable precautions shall be taken to prevent the subsequent permeation of any toxic fumes from that material into any part of the building occupied by people the onus here is placed on materials that give off formal hadide fumes during application and or typical use and concerns its impact on the occupants Ura for malite compound is the main concern here but do not threet you may be luckely having it mixed in your vegan wool products also it is the nature of the material that it is of gasing therefore there needs to be enough separation in the building to limit the passage of the irritant to habitable rooms the health and safety regulator is satisfied that the requirement is met if the cavity wall leaves are of masonry construction wall is accessed to BS 8208 the person carrying out the work is certified and the material Accords with BS 5617 standard installed to BS 5618 standard so heavily standardized process the requirement D is short and sweet so let us move to the requirement e starting with warning of the legislation part e resistance to the passage of sound protection against sound from other parts of the building and adjoining buildings requirement E1 dwelling houses floods and rooms for residential purposes shall be designed and constructed in such a way that they provide reasonable resistance to sound from other parts of the same building and from adjoining buildings protection against sound with a dwelling house Etc requirement E2 dwelling houses flats and rooms for residential purposes shall be designed and constructed in such a way that a internal walls between a bedroom or a room containing a water closet and other rooms and B internal flaws provide reasonable resistance to sound requirement E2 does not apply to a an internal wall which contains a door B an internal wall which separates an uite toilet from the associated bedroom see existing walls and floors in the building which is subject to a material change of use ration in common internal parts of buildings containing floods or rooms for residential purposes that's requirement E3 the common internal part of buildings which contain flats or rooms for residential purposes shall be designed and constructed in such a way as to prevent more revation around the common parts than is reasonable requirement E3 only applies to corridors stairwells hallways and entrance Halles which give access to flat or room for residential purposes and requirement E4 acoustic conditions in schools e4.1 each room or other space in a school building shall be designed and constructed in such a way that it has the acoustic conditions and the insulation against disturbance by noise appropriate to its intended use and two for the purpose of this part school has the same meaning as in section four of the Education Act 1996 and school building means any building forming a school or part of a school as however the requirements are straightforward and the interpretation and guidance of approved documents ions out misconceptions first one of which is what is the room for the residential purposes which basically means any room that is used to live and sleep in but does not include a hospital or similar patient accommodation regulation 41 tells us we need to test the sound instulation of the building when we make certain material changes to it or is it is a certain new building testing and recording data needs to be done to the approved method as and the result conveyed to building control or the regulator within 5 days of completion or at the completion certificate application respectfully dwelling houses and flats may be exempt from this regulation if they use details approved by robust details limited and they notify the building control of it no later than the prescribed times which coincide with the application for building control approval or notice of intention to start now the approved document consists of nine section section 0 to8 that are well worth looking [Music] into section Zero Performance standards in this section we are given the parameters for walls floors and stairs that are deem satisfactory for all the different circumstances and we are told that it is preferred to test the construction rather than to rely on approved robers details but nevertheless this route is also available provided appropriate notification and the right time is given to the building Control Authority naturally testing needs to be done by a test body with third party accreditation and they will be looking into some certain levels of Sound Reduction they have different names and different abbreviations and I'll tell you tell you them right now the abbreviation DNT comma W stands for standard average Sound Reduction on site I should add standard average Sound Reduction and DNT comma w+ CTR that's stand average Sound Reduction but adjusted by low frequency performance RW and RW CTR are laboratory equivalent measurements rnw is the impact transmittance Laboratory test and L NTW impact transmitted onsite test generally the minimum Target levels are at 43 between 43 and 4 5 DB for Airborne Airborne sound adjusted for low frequencies and side tested and 62 to 64 DB for impact sound insulation testing on site to 40 DB for lap tested buildups by the way it is the Secretary of State's view that the requirement E2 is Satisfied by the use of construction of elements that performance are confirmed by lab testing without the need for on-site verification similarly with the requirement E3 we are directed to use of solutions of section seven of this document to satisfy the requirement when it comes to schools we are kindly referenced to use building bulletin 93 acoustic design of schools performance standards published by the Department of Education section one pre-completion testing so the person responsible for testing is the person doing the work we shall test purpose buil dwelling houses and floods or these formed by the material change by the material change of use including the creation of residential per purpose rooms in the buildings that otherwise didn't have it before do not test between Living Spaces or corridors stairwells or hallways but test between the rooms and complete rooms without finishes including flooring for testing it is essential to group testing into building types habitable types and further subgroup by the characteristic of the space and wall build wall and floor buildups and test this to inform the quality of the buildup for for the same group and subgroup in the development this will allow testing of every 10th dwelling house flat or residential room in a group or subgroup but every first of the given group or a subgroup now whether we test flaws or walls we ought to think in two sets of tests if possible between living spaces and between bedrooms the timing and manner of testing should be consulted with the building control body when the particular group or subgroup fails the test it may be necessary to test other similar types of buildings and rooms as well as to remediate the issues the guidance send us to bre information paper ip14 sl02 for further information in any case we will need to Le with the building control to satisfy them of the quality of the remediation work at the particular place of failure but also at the remaining lot of buildings flats and rooms at that group of buildups you see if one failed all of them may be bad but alog together so a consensus needs and the way forward needs to be found between the developer between us and the building control so we can assure that the actual details are are fine and maybe this was only one one particular spot place a buildup that that was faulty going to section two separating walls and Associated flanking construction for new buildings the guide gives four wall types for us to choose from typically solid wall cavity wall solid wall with independent panels on either side of the wall and independent frame walls with insallation flanking noise passage is an important consideration at the junction of walls especially with the similar construction or where walls are tied together the guide is even specifies Dynamic stiffness limits for wall ties to limit the passage of sand between the leaves of the cavity wall it requires dolls to be at least 25 kg per me Square heavy or have RW RW of 29 DBS DB noisy parts of buildings would ideally be separated from the habitable Parts the guide goes on to stipulate densities of walls for refuse shoots solid walls cavity and paneled walls of different materials with consequently which consequently requires the wall to be at least 200 mm thick the guide pays particular attention to in the flanking gaps including those hidden within cavities section three separating flaws and Associated flanking construction for new buildings similarly to section two the guide treats on Floors given us three types to use solid floor solid floor with floating slab and separated timber frame and three and three types of seiling treatments treatment a independent ceiling with absorbent material typically minimum 100 mm Gap filled with 100 mm mm of mineral wool insulation of density at least 10 kg per M cubed and two number of stugger plaster Boards of density at least 20 kg per M squared type B single layer of plas B fixed to Timber buttons through res resilient metal bars with the cavity filled with mineral wool and type c similar to type B but without resilient bars possibly with resilient channels but then the space will need to be infilled with the mineral wall also in any case Junction detailing and typical requirements are shown on the diagrams and further detailed in the text of the guidance picture says a thousand words and I do not have enough tea ready to speak about every single picture at the that that that is available in the documents as there are tens of them the world of advice the world of advice the simply the method the better I'm always Pro solid flaws due to the impact instulation and the thermal Mass but the British fast housing Trends tends to prefer separated Timber with the mineral wool option section four dwelling houses and flats formed by material change of use it is generally understood that if the existing element is within 15% of mass per unit unit area designated for the element in section 2 or3 the element is likely sufficient but there are guidance for improvement approved Improvement works that may be sufficient if if the member if the wall floow isn't sufficient as is in situe naturally there are alternatives and proprietary products that may be used instead as however it is important to identify any continuities of flaws and possible flanking passage of sound the remediation is generally done by either increasing the mass per meter square of the buildup or adding a separate panel with mineral wool absorbing layer assuring enough separation between the old floor or wall and the new panel section five internal walls and floors for new buildings internal walls and flows follow similar consideration but as that as that one of the other section but their density requirement is vastly reduced allowing for the minimum wall thicknesses of 75 M mm and flaws of uniform buildup not requiring separation of suspended ceilings or floating floors section six rooms for residential purposes there's not much philosophy added to residential purpose rooms they they need to follow the already mentioned requirements section seven ration in the common internal parts of building containing flats or rooms for res residential purposes reverberation is an interesting one and it concerns the transition between the access hallways color corridors stairwells stairwells and entrance holes and flats and residential rooms the subject can be approached by using one of the identified methods method number one either by using absorber of an appropriate class rated according to BS I iso1 6545 that be Class C absorber or better for the area of horizontal plane anywhere in the space that faces the area which can be a ceiling and class D for STS areas but reduced to 50% of the area if if we choose to use Class C absorber material or method two which is calculation method and we need to calculate the required minimum of absorptive material using absorptive material using calculation procedure in octave bands so for all different frequencies of sound that Bel low to high pitch we need to calculate all of the relevant areas and applying the most honorous one to to our circumstance that be octaves between 250 HZ and 4,000 HZ the minimum absorption area to be anyhow 0.2 M Square per cubic meter of volume for entrance holes and .25 m squ per cubic met of volume for corridors and hallways to satisfy the requirement a description of the enclosed Space by type and either the result on specific and and either the resultant specifications from the method A or B needs to be stated on drawings or within a report together with plans indicated the assignment of the absorptive material in the enclosed space the guide goes as far as it shows a work example to to follow so that's very it's very good I recommend you have a look at that working example it will make everything so much more clear to you section acoustic conditions in schools and that one isn't long one unfortunately in this section there are no particular directions apart from the reference to the building buletin 93 acoustic design of schools performance performance standards and yeah you basically need to go go there and follow that [Music] so this is it folks the approved document d and e toxic substances and resistance to the passage of sound let's sum it up approv document D toxic substances requirement D1 cavity insulation remember when insulating material is inserted into a cavity wall measures must be taken to prevent toxic fumes especially from form malti from permeating into occupied parts of the building this can be prevented by ensuring that cavity wall leaves are of masonry construction assessed to BSA 208 installed by a certified person and the material that you inject conforms to BS 5617 and Bs 5618 standards approved document e resistance to the passage of sound got four requirements E1 to E4 E1 deals with sand from other parts of the building and adjoining buildings and it says the design and construction of of the element must provide reasonable resistance to sand from other parts of the same building and adjoining buildings requirement A2 deals with sound within a dwelling house internal walls and Floors must provide reasonable sound resistance especially between bedrooms or living rooms requirement E3 deals with ration in common internal parts design and construction must prevent excessive ration from corridors stairwells hallways and entrance halls in buildings containing flats or rooms for residential purposes requirement E4 deals with acoustic conditions in schools and it deals with it by referencing us to have a look into the department of education standards regulation 41 tells us about sound installation tests testing and compliance Sound Performance of the elements of the building must be tested and data recorded for certain material changes of use and for new buildings with results submitted to building control exemptions May apply if using robust details limited approved methods and taken the building control has been notified of this preferred route beforehand going section by section now section zero sets performance standards for walls floors and stairs details par detailed parameters parameters for satisfactory sound installation recommending testing over relying solely on robust detos section one describes pre completion testing and it recommends testing for different building types and groups to ensure quality but to avoid the necessity to test every single build section two sets the scene for separating walls it provides guidance on typical wall types and flanking constructions flanking consideration in any given construction to limit sound transmission section three separating flaws give similar guidance to flaw types and seiling treatments section four material change of use offers approved Improvement Solutions and works for existing elements section five internal walls and flaws follow similar consideration of previous sections but reduce density requirements for internal walls and Floors section six rooms for residential purposes extend previous consideration to residential purposes rooms section seven reverberation in common areas gives methods and a working example for the management of reverberation in common areas of residential buildings Section 8 acoustic conditions in schools refer refers us to building buletin 93 for detailed guidance in the next episode we will move to approve document F volume one dwellings and volume two buildings other than dwellings when it comes to ventilation [Music] I hope you enjoyed this episode and that the consideration of the approv document d and e toxic substances and resistance to the passage of sound is now clear for you if you have any questions reach out to me on LinkedIn or send me an email I'm more than happy to help you out in BNA we deal with planning designing and managing of your projects and we are always glad to facilitate a free initial consultation to Ste you in the right direction visit www.but now.co and reach out to us whether your question is if we can help you with your project or 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 approved 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 remember 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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