Rigid Foam Insulation Roof Detail

First the foam will increase thermal performance by adding r value and minimizing thermal bridging.

Rigid foam insulation roof detail.

Foamular roof insulation is made with a high percentage of pre consumer recycled material. 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. Detail the outer layer of the insulating sheathing as a drainage plane. Transfer the markings for framing locations through each layer of insulating sheathing.

Install rigid insulation board over the air control layer in multiple layers with joints offset vertically and horizontally between adjacent layers. 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. 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.

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. Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate are the most used types of rigid foam insulation. Foamular roof insulation can help contribute to credits under the leadership in energy and environmental design leed program of. 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.

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