Vented Rigid Roof Insulation

Ventilation and attic vents.

Vented rigid roof insulation.

Learn about insulation and cover boards. The code also allows for air permeable insulation such as fiberglass or cellulose to be used under the roof deck as long as rigid foam is used above the roof sheathing. Extend the foam beyond the wall be about 4 5 inches. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof.

Code specifies the minimum r value of the rigid foam layer. Get to know more about one of the most popular commercial roofing systems. In this case the rigid foam can be thinner than when it s used alone. Cool vent is a venting composite insulation board that consists of a 4 x8 panel of rigid polyiso a middle layer of solid wood spacers creating a standard 1 air space and a top layer of apa teco rated osb or plywood.

Atlas offers accessories to promote airflow. Venting the roof deck. Consisting of acfoam ii or acfoam iii polyiso insulation board and osb or cdx plywood separated with and bonded to 5 individual expanded polystyrene vent spacer strips. This will make it easier to weave into exterior wall foam when siding replacement happens.

Solar and other residential products solar and other residential products. Rigid foam also can be installed above the roof sheathing in tandem with air permeable insulation between the rafters. Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space. When hvac equipment is in the attic insulation and an air barrier at the roof line brings that equipment within the conditioned enclosure envelope thereby allowing it to operate in more favorable temperature and humidity conditions without air leakage and heat loss gain directly to the exterior.

Cool vent is the environmentally intelligent choice for steep slope roofing applications and is viable in green and sustainable building designs. Rigid foam and spray foam are two of them. Install two layers of rigid foam with the seams offset. Condensation control is most often accomplished by installing rigid foam above the roof deck or by installing air impermeable spray foam insulation directly against the underside of the roof deck.

To keep air flowing from the soffit to the ridge it s important to keep attic insulation from covering the vent to the exterior. Tape the seams on the second layer.