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ADLIan

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  1. ADLIan
    The above link references a BBA cert that appears to be no longer valid. The replacement certificate now includes the vent cavity behind the cladding system. Check MIs and 3rd party certificates for exact requirement, accepted good practice is that render should not be applied direct to TF or insulation on TF.
  2. ADLIan
    How is eaves to ridge vent provided in that construction?
  3. ADLIan
    SAP always includes a heating system, if none specified then default is electric so no need to hide any dedicated outlets.
  4. ADLIan
    Approved Docs do cover heat loss from pipes and reference the Domestic Building Services Compliance Guide.
  5. ADLIan

    Help

    ADLIan replied to Help needed20's topic in Damp & DPCs

    External wall becoming internal? No vertical dpc?
  6. ADLIan
    With plasterboard on dab you can add the thermal resistance of the airspace (& dabs) too so will be better than wet plaster. Where wet plaster may offer an advantage is in improving the air tightness of the wall.
  7. ADLIan
    Second quality insulation would not be fit for use under the Regs. as it will not comply with the relevant BS, carry CE mark or be BBA approved. Not sure how well this is policed though. Also insulation may be branded as a second for not being the right thickness but more seriously may also have failed other tests such as compressive strength or thermal performance.
  8. ADLIan
    Get the insulation manufacturer to do them. They tend to have the correct software and know the conventions that must be used
  9. ADLIan
    Re U value. Thermal bridge in layer 5 at 15% timber will have a big impact. Resistance of 25mm airspace is wrong, should only be 0.18 (not 1.02)
  10. ADLIan
    This is the problem with any injected cavity wall insulation - the tolerance on installed density and the crude method used to asses the adequacy of fill means it is impossible to be sure there are no voids. Only solution would be a thermographic survey (or build the insulation in so you can see any missing pieces!)
  11. ADLIan
    The U-value of tapered roofs may be based on the maximum U-value/minimum thickness (subject to back stop values in Approved Docs L & C) or the 'average' thickness for the desired U-value. With most tapered systems the U-value is not the simple arithmetic average, the calculation method is in BS EN 6946 and involves splitting the roof down to various set shapes. This is probably a job for the system designer.
  12. ADLIan
    LABC issued certificates for both Celotex & Kingspan after both manufactures approached their local building control office in West Suffolk & Hereford. Kingspan swamped the BCB at Hereford with fire test data and it does not appear that they were experienced or qualified to make a judgement - K15 certainly should not have been classed as ' limited combustibility'.
  13. ADLIan
    Market forces and latest Appr Doc B has sorted high rise!
  14. ADLIan
    The problem with both kingspan and celotex and fire goes back to 2008 when new European/British manufacturing standards were introduced with new fire tests (BS EN 13501-1). If they had adopted these tests their products would have been classed as ‘combustible’ and they would have lost a lot of business. Instead they hid behind the old BS 476, Parts 6 & 7, tests which are simply not relevant to the pur manufacturing Standard. PUR/PIR and phenolic foams will be classed as combustible but may fall into slightly different Euroclass categories (C or D?)
  15. ADLIan
    Where in the Building Regs or Approved Docs does it give information on min. roof falls?
  16. ADLIan
    BS 6229 states design fall should be 1:40 to make sure actual fall is no worse than 1:80 accounting for site tolerances & inaccuracies. There are some waterproofing systems designed for zero falls - these should have 3rd party certification and need careful design (no back falls).
  17. ADLIan
    Could try Recticel or Extratherm, they don’t appear to be caught up in this mess.
  18. ADLIan
    We may drift off topic here. But basically both lied about fire performance, used outdated test data, changed the chemistry of products, openly confused the market.....Does not make for good reading. Celotex also admitted overstating thermal performance just after the Grenfell fire. Yes, other manufacturers are available.
  19. ADLIan
    For a new extension wall you need 0.28 W/m2K. For new build house it depends upon the numbers that come out of the SAP assessment, looking at better than 0.25, ideally better than 0.20. After the revelations at the Grenfell Inquiry this week not sure why anyone would consider Celotex or Kingspan.
  20. ADLIan
    That one looks to be more relevant. Your bco will have to decide if kiwa certificate is acceptable. Kiwa cert looks to be very much desk top study based. BBA have full size test rigs to make sure cavity gets fully filled and system will resist rainwater penetration - not sure if kiwa do this, .
  21. ADLIan
    @oldkettleCheck with manufacturer. Read the certificate very carefully. Does not appear to cover cavity between 2 masonry leaves (a traditional masonry cavity wall detail)
  22. ADLIan
    Awhile since I was involved in consultation on RHI. It was originally planned for upgrading heating systems in existing housing and tied in to certain fabric upgrades. Not sure why self builders were given exemption, as you state with a well insulated modern build payment is minimal.
  23. ADLIan
    There is a table in L1A that mentions 0.18 in walls but this figure is not cast in stone. Possible to still get compliance with a wall at 0.25(ish). SAP gives a lot of design flexibility.
  24. ADLIan
    Very little insulation in a 1980s timber frame house so condensation risk very different from current standards. From memory issue in 1980s was bad building practice and poor detailing leading to moisture penetration and subsequent rot, may also have been issues with fire performance. Also remember reports of media overhyping the issue of only a few actual problems - didn’t help Barrats though. Current timber frame construction is a world away from back then.
  25. ADLIan
    Might not be a common detail but no reason not to insulate in cavity provided 50mm min cavity kept before brick outer.
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