Rigid Foam Insulation Roof Detail

The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold.

Rigid foam insulation roof detail. Adding the metal roof insulation can be done easily when you renovate your house. Insulated roof assemblies can be vented or unvented. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. If providing a vented over roof.

First the foam will increase thermal performance by adding r value and minimizing thermal bridging. 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. Detail the outer layer of the insulating sheathing as a drainage plane. Or you may also consider metal roofing over rigid insulation details even though it might be a bit pricier.

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. You will need to hire some well trained roofing insulation experts to make a more energy efficient home. Foamular roof insulation is made with a high percentage of pre consumer recycled material. Polyiso is an easy cost effective sustainable and energy efficient construction material.

In warm climates zones 1 through 4 low density open cell spray foam insulation is the typical choice since it is vapor permeable and will allow drying of the exterior sheathing and roof framing if they happen to get wet via diffusion into the interior of the building. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing. Install rigid insulation board over the air control layer in multiple layers with joints offset vertically and horizontally between adjacent layers. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced.

It is the only xps insulation with certifi ed recycled content certifi ed by scientifi c certifi cation systems. 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. Foamular roof insulation can help contribute to credits under the leadership in energy and environmental design leed program of. Transfer the markings for framing locations through each layer of insulating sheathing.