Mike_M Posted May 13, 2021 Share Posted May 13, 2021 As per the title, is there any reason why I could not use cavity slabs in a garden room flat roof? The roof is a cold roof, I have 125mm roof beams and am allowing 50mm under the deck for air so have 75mm for insulation and the cavity slabs are cheap and easily cut and fitted. I don't have the budget for PIR boards. Link to comment Share on other sites More sharing options...
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