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ADLIan

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Everything posted by ADLIan

  1. ADLIan
    The properties to be tested should be chosen by the BCO not the developer/builder - yet to see that happen!
  2. ADLIan
    Another example of lack of enforcement of the Regs! The Building Regs are very specific on the air tightness testing regime, see Section 3.17 of Appr Doc L1A, requiring testing of 3 of each house type or 50% of each house type, whichever is the less. The SAP assessor should pick this up too as a copy of the test certificate needs to be provided for each tested unit and the convention is to add a penalty of +2 to the measured value for the untested dwelling type (Section 2.9).
  3. ADLIan
    Many breather membranes used in TF and roofing are degraded by UV light. Check with manufacturer the maximum exposure, some as little as 3 months, others up to 6 months.
  4. ADLIan
    EPDM upstand at roof edge should be min 150mm high too.
  5. ADLIan
    Sealing the edges alone (must be top, bottom & sides and prevent any air infiltration so cavity stop sock) reduces U-value to 0.2 W/m2K. Not sure how you do this in retrofit. Remember injected insulation must be the fluffy stuff (glass or stone wool, min 18 kg/m3) as this has been shown not to adversely impact the acoustic insulation across the party wall. Do not use eps bead or pur as these may (will?) ruin the acoustic performance and neighbours may complain.
  6. ADLIan
    Work done by Leeds Met Uni and mineral wool manufacturers association. This is one reason party wall thermal bypass was included in the Regs a couple of updates ago. In theory reduces U-value of party wall from 0.5 to zero W/m2K. Check energy savings - payback at above costs may be long time!
  7. ADLIan
    A very good reason not to have injected insulation in new build (perhaps a different case with older houses where anything, even if not fully filled, is better than nothing). Also having been involved in the development of this type of product it is impossible to be sure that the cavity is completely filled and at the right density. At least with a built-in product you can see it installed and check the quality of workmanship. I note some of the volume house builders are using these injected products (allows them to blame someone else for poor installation!).
  8. ADLIan

    EPS Beads

    ADLIan replied to Onoff's topic in Heat Insulation

    Probably not - total lack of any technical info. High performance mineral wool would be best option.
  9. ADLIan
    XPS. OK below dpc.
  10. ADLIan
    As an alternative simply confirm all fittings comply with Table 2.1 in AD G!
  11. ADLIan
    Re linear thermal bridges. The difference between the default y-value (0.15) and the calculated value from a more detailed analysis using ACDs may only about 3 SAP points. However it will make a massive difference in CO2 emissions (DER) and the fabric energy efficiency (DFEE). Probably enough to result in an overall Building Reg failure on these 2 criteria.
  12. ADLIan
    Bringing this back to the top in the absence of further information. The original assessor is correct, the Sunamp adds nothing to the electric heating and it is treated as an instantaneous space & water heater, no thermal store is accounted for. The fact that the house is all electric will account for the relatively low EPC rating even if very well insulated, the PV helping the rating though.
  13. ADLIan
    Got to agree. More useful if public to be any use for the OP. Noticed this was discussed on here a couple of years ago with no real resolution.
  14. ADLIan
    @vivienz have you discussed this with your SAP assessor? Could be that he is treating the sunamp correctly within SAP. An all electric house will prove difficult to get a pass, due to the high CO2 emissions, unless PV used. Perhaps someone from sunamp ( @AndyT ) will be along soon to advise. Also all linear thermal bridges should be noted and assessed so this listing should be there and is important.
  15. ADLIan
    Note that SAP 'approved' product must be used if you want to take advantage of this technology. Also don't expect any meaningful improvement in SAP rating (+1 point if lucky?) or CO2 emissions (less than 0.5 kg CO2/m2/yr reduction?) depending upon system, water use etc, etc.
  16. ADLIan
    There are 2 basic types of joist hanger - onto masonry and onto a timber ledger. The masonry ones are built into the mortar beds and hook over the block - they are not nailed. The others are nailed onto the timber ledger. In both instances manufacturers give very strict fixing instructions.
  17. ADLIan
    I’m an accredited assessor. PM if you need more info.
  18. ADLIan
    Hi Mike. Don’t want to rain on your parade but I’m not sure the fire resistance value for the floor can simply be extended to cover the wall too. Also from memory the white book gives solutions for one hour fire resistance based on solid timber studs plus plasterboard - note different stud sizes for 30min & 60min.
  19. ADLIan
    Surface spread of flame (Class 0 etc) is a different part of BS 476 than the fire resistance tests. A Class 0 facing material does not automatically give 30min or 60min resistance (PUR insulation can be Class 0 and look at Grenfell). For external walls normally 60min resistance is required from BOTH sides. It appears that I-joists are being used and this may be the issue as they are only as strong as the relatively thin web in the BS 476 fire resistance test and this may be ringing alarm bells with your BCO. Perhaps have a chat with the I-joist manufacturer as there is no mathematical modelling here, reliance is made on actual test results.
  20. ADLIan
    They meet Regs provided you know the solutions (they wouldn’t have a market otherwise). Normally use mineral wool so acoustic performance is fine.
  21. ADLIan
    Don't think this one has been covered here and been slipped into AD L1A/B when no one was looking. The Domestic Building Services Compliance Guide has been updated and effective April 2018 promotes the use of more complex control systems and flue gas heat recovery. See the Planning Portal website. Ian Full link below https://www.planningportal.co.uk/info/200135/approved_documents/74/part_l_-_conservation_of_fuel_and_power/5
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  22. ADLIan
    Changing 2 houses into one may require planning permission (material change of use) but depends upon local policy (one less house in the area is the issue). Building Reg required including Appr Doc L1B which dictates required U-values and upgrades required, though BCOs have a lot of flexibility in allowing relaxation of some of these (not being able to afford the upgrades is not an allowable relaxation I'm afraid). The new dwelling may also require an on construction EPC on completion.
  23. ADLIan

    Cavity Socks

    ADLIan replied to Barney12's topic in Timber Frame

    The fire rated foam (and mastic, putty etc) is for fire stopping where services penetrate a fire rated wall and NOT intended for cavity barriers (see Appr Doc B). Also not sure you can make your own as most manufactured products appear to have certification to show at least 30 min protection when tested to BS 476, part ??. Best check with your BCO.
  24. ADLIan
    In a warm pitched roof it is acceptable to put a limited amount of insulation between the rafters (depends on thermal resistance of this layer). In a warm flat roof additional insulation should not be used between the roof joists. Probably OK in a limited area, but keep to minimum above the wall head, to improve sound insulation.
  25. ADLIan
    Item 35 is a requirement of the Regs but very rarely enforced. The actual wording is a bit vague - a full 20+ page report would look great but a simple, single paragraph statement has been accepted by BCOs. Perhaps keep statement short & simple and hope this satisfies BC.
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