Spray Foam Insulation Under Roof Deck
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Open cell spray polyurethane foam ocspf and closed cell spray polyurethane foam ccspf insulation sprayed to the underside of roof sheathing is a popular strategy for increasing roof insulation levels in all climate zones.
Spray foam insulation under roof deck. Spray polyurethane foam is approved for use as an insulation material in contact with soil but we do not know how foam scraps would perform as soil fill therefore cannot recommend its use for this purpose. But that only works if the installer can get it into the places where most of the air leakage happens. A properly done spray foam job not only insulates but also greatly reduces the air leakage of a home. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly.
Spray foam insulation is an incomplete name. Polyurethane spray foam metal roof insulation the spray can be basically applied on top or bottom of the metal roofing surfaces. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. It really should be called spray foam insulation and air barrier.
Compared to the fiberglass batts this insulation is much better. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Install spray foam insulation along the underside of the roof deck to create an insulated unvented attic which can provide a conditioned space for hvac equipment that is located in the attic. The standard means of disposal of spray foam scraps is to dispose in normal construction waste to a landfill.
Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing. When the choice is made to insulate along the underside of the roof deck spray foams have advantages over other insulation types because of the ability of spray foams to effectively air seal complex assemblies. Financially speaking this spray is a great option especially when you need to renovate your roof after the application. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.