Venting Exception For Spray Foam Roofs

This alternative to traditional building insulation fiberglass can be applied into wall cavities holes concrete slabs and even onto roof tiles and.

Venting exception for spray foam roofs. Zones 5 6 7 and 8 in that the manufacturers of these materials assume that roof deck may require ventilation to assist drying. An alternative option is to insulate the rafter bays with a less expensive insulation like fiberglass or cellulose and to control the temperature of the roof sheathing with rigid foam. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof. Roof vents are great for allowing air to move and for removing toxic odours from the home.

If spray foam is used a vent space may still be needed directly under the roof deck. Spray foam insulation can even be applied with roof vents. Care should be taken with these assemblies particularly in cold climate zone locations i e. He is a sprayed polyurethane foam association spfa accredited building and roofing inspector and an instructor for spfa courses for applicators and inspectors.

Knowles chairs the astm subcommittee on spray foam roofing and the astm task group responsible for astm c 1029 spray applied polyurethane foam specification. Spray polyurethane foam is a chemical product that is created by two materials isocyanate and polyol resin that will react with each other when they are mixed and will expand up to 30 to 60 times its liquid volume as it is sprayed in place. We have the capabilities to spray and inject a variety of foam systems to achieve a high r value while providing both effective vapor and air barriers. Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space.

Open cell spray polyurethane foam or closed cell spray polyurethane foam ccspf insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in. An energy recovery ventilator right and a duct distribution box center in a spray foam insulated home. Of open or closed cell spray foam in their roof or to stack a half foot of rigid foam on the roof deck. Similarly not everyone can afford to spray nearly 10 in.

All of these materials are supported by quality assurance testing capabilities that. Rigid foam and spray foam are two of them. However many people think that roof vents cannot be used in conjunction with spray foam insulation. All insulation materials require proper venting.