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  1. H

    Flat roof insulation. To vent or not?

    Posted under another section but no answers so I thought I'd re-post here. Hi, I am about to finish insulating the roof on my garage. It is approx. 6.5mtrs X 2.5mtrs wide with the joists running across the width. It currently has a cold deck and I have 120mm celotex to put between the...
  2. H

    Flat roof insulation vent or not?

    Hi, I am about to finish insulating the roof on my garage. It is approx. 6.5mtrs X 2.5mtrs wide with the joists running across the width. It currently has a cold deck and I have 120mm celotex to put between the rafters. The joist are notched into the bricks with the top of the joists sitting...
  3. H

    Insulating between garage rafters.

    I've got to insulate a detatched garage flat roof that I'm turning into a studio/workshop. At the moment the roof is just felt covered ply, sitting on top of the 8x2s. I have aquired enough 100mm celotex to insulate the whole roof but I'm unsure wether to place the boards so that they are flush...
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