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Posted By: RobinBa sandwich of OSB and foam board insulation
Posted By: tonySo your membrane is going straight on top of PUR? sounds like madness to me.
Posted By: PikeyAnother sheet of ply on top would cost another £400, plus we've already paid a premium for the specific insulation designed to have EPDM applied directly to the top, so its not an option. Even if the EJOT fixings cost £400 it's still a better option.I think I've just about accepted that the fixings are going to have to go through the ply into the joists, not just into the ply.
Posted By: fostertom Don't think a CRA looks at one material next to another e.g. studs next to Cellotex in the same layer, in fact a Euler diagram based one actually ignores the studs?
Posted By: Mike GeorgeYes, I believe it does ignore the studs. That's because in a construction like this the dew point will be constantly beyond the insulation layer. ie on the cold side.
Posted By: Mike GeorgeFor Option 1Homogenous layers of12.5mm plasterboard150mm spruce75mm PURBituminous felt20mm airgapslateResult Zero risk of interstitial condensation
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