If I need 100mm of kingspan or equivalent underneath a concrete floor slab, then can I use two 50mm sheets laid on top of each other, or will this cause vapor issues?
The reason I ask is that there's some left over 50mm and 25mm near me that's going for a song. I need 100mm and 25mm upstands, so if I can double up then I'm quids in, and saving the planet!
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