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chrisbmx116-
No one would give me a simple ">150mm" answer, I guess cause it depends on the board, the way the roof is put together, etc etc.
100mm is probably ok, we'll end up with about 180mm I think. The architect was allowing for less efficient but more eco friendly options like rockwool.
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I wonder what min regs are?
Isn't it to achieve a specific U value?
dbr
Howard
Our architect specified 280mm of insulation for the extension roof! I said that was silly.