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    97mm Joists What thickness of Rigid Foam Insulation?

    I want to put rigid foam foil backed insulation between my rafters and probably on top at a later date + boardout. I've measured my joists and there actually 97mm so my question is do i buy 100mm or 95mm board. Reason I'm not sure is that if I use 100mm and board I'm worried it might push...
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