Spray Foam Roof Assemblies

Looking upward through the open ceiling if the exterior wall and roof deck assemblies both contain spray foam then a continuous insulation and airtight layer is established from the base of the walls to the peak of the roof.

Spray foam roof assemblies.

There is no potential for condensation until interior moisture levels exceed 45 rh at 70 f during the coldest month. At year 10 20 a contractor will add more coating and granules. On exterior spray foam roofing applications the roof sealing foam should be coated with a white roof coating after curing. Spfa 138 guideline for roof assembly evaluation for spray polyurethane foam roof system 8 pages including roof surface assembly considerations.

Unvented roofs with spray foam applied to the underside of the roof deck have been used since the mid 1990s. The foam never gets touched and never loses r value. Or 25 mm minimum thickness and vapor retarder at 2 in. Two layers are preferable to one layer due to increase in air flow resistance.

R 46 unvented roof assembly two layers of r 6 5 inch rigid insulation yielding a total combined thickness of 2 5 inches. A very energy efficient enclosure results. Since a spray foam system consists of spray foam coating and granules after 10 20 years some of the coating and granules will naturally wear away. Unvented roof assemblies with ccspf work well in all climate zones and serve several important functions.

Layers of rigid insulation have staggered joints to facilitate airtightness. 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. Image courtesy of d7 spray foam insulation houston tx. A spray foam roof can be the last roofing system you ll ever need on a building.

Spfa 130 spray polyurethane foam roofing updated spf roofing brochure the high performance cost effective weather resistant solution for commercial industrial and residential structures. This roofing foam insulation is a higher density 3 1 lb ft foam that cures to rigid in several minutes. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Or 50 mm minimum thickness and therefore does not need an additional vapor retarder in cold climates.

Spf roof patch spray foam is commonly used for sealing and insulating roof systems.