garden offcie/room roof

rxbren · 22 Nov 2014

Hi it of an odd question but cant find an answer
ive got 150mm joists for the roof and planning to fill with insulation ive got enough 100mm sheets of celotex to do the whole roof but need to also fill the extra 50mm is it going to be ok to fill the remaining gap with 50mm polystyrene or will it cause problems?

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garden offcie/room roof

rxbren

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