Gary Martin Posted Thursday at 16:07 Share Posted Thursday at 16:07 Could I build a new house with 50 mm uninsulated cavity block walls, with, say, 100 mm of celotex/ kingspan fixed to the inside walls, then service battens,vapour barrier, plasterboard and skim. would it pass building regs ? Link to comment Share on other sites More sharing options...
G and J Posted Thursday at 17:46 Share Posted Thursday at 17:46 No. Link to comment Share on other sites More sharing options...
Redbeard Posted Thursday at 17:56 Share Posted Thursday at 17:56 Internal insulation (IWI) carries the biggest risk of interstitial condensation - vapour condensing on the masonry surface of the wall behind the insulation, since the insulation make the wall cold by isolating it from the heat source. It may be a good compromise solution for existing buildings but not new-build, in my view. How about building solid block with EWI (thickness depending on material)? Why are you thinking of a cavity. What is it doing, in your view? Link to comment Share on other sites More sharing options...
Gary Martin Posted Friday at 15:40 Author Share Posted Friday at 15:40 Cavity for weather protection. Surely if insulation is held tighter against internal skin, there is no gap to slow condensation, also the celotex acts as a secondary vapour barrier to supplement a fully sealed one. any moisture in the blocks could dry out via the ventilated cavity. ? ps MVHR system will also be fitted. thanks for your comments gary Link to comment Share on other sites More sharing options...
Gary Martin Posted 12 hours ago Author Share Posted 12 hours ago Thanks G&J. Could you expand please? I’m new to self building and keen to learn. thanks Link to comment Share on other sites More sharing options...
Conor Posted 5 hours ago Share Posted 5 hours ago From the collective experience and wisdom here, the consensus is stick to standard, proven methods of construction. You have to take account of the what most builders and trades are used to working with. Start doing something unusual, and somebody down the line will cock something up. Link to comment Share on other sites More sharing options...
G and J Posted 5 hours ago Share Posted 5 hours ago 7 hours ago, Gary Martin said: Thanks G&J. Could you expand please? I’m new to self building and keen to learn. thanks I would suggest posing the question from a different angle. What exactly are you planning to build and what factors are you focussed on? Overall cost? Wall thickness (or thin-ness)? DIY-ability? etc…. Link to comment Share on other sites More sharing options...
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