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About ADLIan

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  1. ADLIan

    Cavity wall requirements around windows

    Is this new build in England? Probably OK returning the blockwork but leave space for a 50mm (min) insulated cavity closer - not ideal but will meet BR minimum requirement. Better to use 150mm insulated cavity closer and use bracket/cleat to fix window frame - may be much simpler to install too, saves a lot of time cutting and laying blocks around each reveal. Cavity closer manufacturer may offer values for linear thermal transmittance - enhanced values can be used in SAP which can be advantageous.
  2. +1 on above. I doubt the frame material has an impact on the acoustic performance. Acoustic performance depends mainly on number of panes, glass thickness (better with 2 or more different thicknesses), gap between the panes and addition of an acoustic absorber between the panes. Remember as soon as you open a window its acoustic performance reduces to zero!
  3. ADLIan

    Edpm at edges

    With a buried roof the slab should not be cast directly onto the waterproof membrane. A drainage layer of gravel or specialist drainage membrane should be used. Water drainage should be a 2 levels - at the level of the epdm membrane and at the finished roof surface. Specialist drain outlets are available for this. Level, flush fitting, roof lights are also a specialist product. Can’t help feeling that the roof will be forever problematic without a major renovation and correct detailing and product selection. Lots of info on internet on buried roofs or podium roofs.
  4. ADLIan

    Rockwool EWI ?

    15% is about right in my experience for standard stud TF (not larsen truss or I-beam). I've seen it as low as 12% but also as high as 20+%- a value mentioned by Warmshell in one of their design guides! The Appr Docs refer to BR 443 which gives the 15% bridged value. I note Warmshellinsulation has a BBA cert for a rendered external wall insulation system but it limited to masonry background. They also mention that they have an applied for BBA cert for this system on TF. It appears this goes back to 2015 and still no certificate issued. As mentioned above a similar certificate (based on wood fibre) was withdrawn or allowed to lapse a few years ago. I would still refer you to the above documents and the fact that render onto insulation direct onto TF is not accepted good practice.
  5. ADLIan

    Edpm at edges

    Bit late to comment on this but Google ' buried roofs' or 'podium roofs' and you'll see how difficult these are to design and really need specialist input especially with your flush roof lights. Need robust design and robust materials as remedial works are difficult (=expensive). Have you arranged for drainage of rainwater from directly above the EPDM membrane? Without this I imagine the roof will be plagued with problems.
  6. ADLIan

    Rockwool EWI ?

    I had included the 100mm external insulation - as you say this does mitigate the effect of the TF fraction. 15% bridging is the default value and includes for the additional timbers around openings, at floor levels, corners, head & sole plates etc and is normally about right, may reduce to approx 12% if you're lucky. Bottom line is the U-value has not been produced in line with UK BR Appr Doc requirements. This is all a bit academic now as the wall is done! The important point, and where this thread started, is the requirement for a vent void behind the render system in TF walls.
  7. ADLIan

    Rockwool EWI ?

    An additional comment. The U-value calculation from ProDave is wrong as there is no correction for the timber frame creating a thermal bridge (normally 15% bridged proportion) and this would increase the U-value to nearer 0.16 W/m2K.
  8. ADLIan

    Rockwool EWI ?

    Most of the insulation manufacturers in the UK will provide a U-value and condensation analysis calculation. Some may also do the thermal response/phase shift numbers. Note that it is NOT accepted good practice to render onto insulation onto the timber frame - see 'Timber Frame Construction' from TRADA, Bldg Reg Approved Docs, TF kit manufacturers details etc. One of the wood fibre insulation manufacturers had a BBA certificate for a direct render system but this appears to have lapsed or been withdrawn. The issue is not so much condensation but liquid water penetration through the render system as referenced by Mr Punter.
  9. ADLIan

    Lead finishing - roof

    They’re only the soakers ar each course of slate. Lead cover flashing (longer length, approx 1~1.5m) still needs fixing, chased into wall.
  10. ADLIan

    Proposed Roof Details

    Is this new build house or extension? For new build expect U=0.15 or better. For extensions BR require 0.18 or better +1 to most of the above, especially multi foil! I would not bother with Frametherm 32 (extra cost for minimal improvement on U-val especially timbers at 400mm c/c) - go for 35 version. Fully fill the rafter space with this, breather membrane, counterbatten, batten & slate with 50mm PUR under rafter. Note this is not a warm roof. It gives a warm roof space but to be a warm roof construction the majority of the insulation must be above the rafters.
  11. U-vals are always for the whole wall (or other element). Old cfc blown pur had lambda of approx 0.020 W/ mK but expect this to degrade considerably in this application to nearer 0.03 W/mK.
  12. Expect U=0.43 at best, perhaps 0.45.
  13. ADLIan

    Loft roof insulation

    Normal quilt loft insulation cut to fit between timber. Leave last few feet rolled up and push/unroll into place with help of a broom. Add further layers same way if needed.
  14. I was involved in that testing program. No real surprises from this testing compared to standard BBA recommendations, especially hit and miss issues with blown products.
  15. Check product BBA cert. Subject to certain caveats full fill, especially at 300mm, can often be used in any exposure zone. 50mm clear cavity safer still.