Rigid Foam Insulation Roof Detail

Adding the metal roof insulation can be done easily when you renovate your house.

Rigid foam insulation roof detail.

If providing a vented over roof. While all foam insulation products are derived from petroleum some of the key differences include water resistance r value per inch compressive strength facings permeability to water vapor and evidently cost. First the foam will increase thermal performance by adding r value and minimizing thermal bridging. The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold.

Transfer the markings for framing locations through each layer of insulating sheathing. All atlas acfoam polyiso insulation boards are qualitymark certified providing consumers an easy way to identify premium products that meet or exceed building codes for the best in roof performance. Detail the outer layer of the insulating sheathing as a drainage plane. Second the foam will keep the sheathing warm so moisture passing through the wall or roof will find no cold surfaces for condensation to occur.

There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing. Foamular roof insulation can help contribute to credits under the leadership in energy and environmental design leed program of. Foamular roof insulation is made with a high percentage of pre consumer recycled material. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

Install rigid insulation board over the air control layer in multiple layers with joints offset vertically and horizontally between adjacent layers. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing. Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate are the most used types of rigid foam insulation. There s a reason polyiso rigid foam insulation is used in more than 70 of commercial roof construction as well as in many residential builds.

Polyiso is an easy cost effective sustainable and energy efficient construction material. Or you may also consider metal roofing over rigid insulation details even though it might be a bit pricier. Insulated roof assemblies can be vented or unvented. It is the only xps insulation with certifi ed recycled content certifi ed by scientifi c certifi cation systems.