Spray Foam Underside Of Roof Deck

But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. 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. Spray foam insulation applied on the underside of the roof deck in cold climate commercial buildings allows for a significant reduction in condensation potential particularly compared to interior air permeable batt systems.

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Insulation Below Roof Deck

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It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.

Spray foam underside of roof deck.

Unvented roofs with spray foam applied to the underside of the roof deck have been used since the mid 1990s. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. 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. As air impermeable insulation spray foam insulation can be used in such applications.

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