Roof Insulation Construction Details

Our in house technical department is available to help provide accurate design and construction details for insulfoam products.

Roof insulation construction details.

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. Load bearing or primary structure usually constructed in timber in a residential construction. 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.

In this case the insulation must lie directly on top of the ceiling. In most cases the attic is ventilated and the infiltration barrier is the drywall ceiling. The insulation is immediately below the waterproofing layer. The vapour control layer is above the decking but below the insulation.

In residential wood frame construction this involves installing rigid insulation between the roof shingles and the roof plywood or osb. The construction of the flat roof is similar to that of the timber upper floor. To get the details most relevant for your project contact us with your specific design build needs. 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.

My concept should yield about an r52. View the complete roofing manual for all product details. And possible for good reason and that s why i am here. The installation of the rigid insulation elevates the temperature of the roof deck to minimize condensation.