Roof Insulation Construction Details

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Roof insulation construction details.

Load bearing or primary structure usually constructed in timber in a residential construction. Most details show a second layer of sheathing on top of foam then the roofing material. In residential wood frame construction this involves installing rigid insulation between the roof shingles and the roof plywood or osb. My concept should yield about an r52.

There are many article on foam over roof sheathing but after much searching i failed to find a detail like the one i have put together. The vapour control layer is above the decking but below the insulation. Roof insulation systems applications. Roof deck providing the base for the waterproof membrane and in some cases the insulation.

The insulation can be adhered mechanically fixed or loose laid. Roof ceiling insulation insulation in roof ceiling constructions must be placed in direct contact with the infiltration barrier. The installation of the rigid insulation elevates the temperature of the roof deck to minimize condensation. And possible for good reason and that s why i am here.

The construction of the flat roof is similar to that of the timber upper floor. In most cases the attic is ventilated and the infiltration barrier is the drywall ceiling. In this case the insulation must lie directly on top of the ceiling. The insulation is immediately below the waterproofing layer.