Roof Insulation Construction Details

In most cases the attic is ventilated and the infiltration barrier is the drywall ceiling.

Roof insulation construction details.

Roof ceiling insulation insulation in roof ceiling constructions must be placed in direct contact with the infiltration barrier. Load bearing or primary structure usually constructed in timber in a residential construction. The vapour control layer is above the decking but below the insulation. A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.

Most details show a second layer of sheathing on top of foam then the roofing material. Roof insulation systems applications. In residential wood frame construction this involves installing rigid insulation between the roof shingles and the roof plywood or osb. In this case the insulation must lie directly on top of the ceiling.

The installation of the rigid insulation elevates the temperature of the roof deck to minimize condensation. Our in house technical department is available to help provide accurate design and construction details for insulfoam products. View the complete roofing manual for all product details. To get the details most relevant for your project contact us with your specific design build needs.

The construction of the flat roof is similar to that of the timber upper floor. 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. Roof deck providing the base for the waterproof membrane and in some cases the insulation.