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Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls.
Spray foam underside of roof in attic. 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 s not coming from above the roof and it s not some new moisture source resulting from the spray foam. In this design insulation effectively separates the interior and exterior spaces while slowing down moisture flow so the dewpoint is not achieved within the building envelope. Attic ceiling to stop airborne moisture from reaching a cold surface and condensing inside the building envelope.
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. The insulation reduces wildly high temperature spikes and so the attic becomes a conditioned part of the home like any other room. Unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. Lstiburek takes blame for bad language.
When spray foam is installed on the underside of the roof deck the attic space is insulated from heat that otherwise would be entering the attic. Insulating and providing airtightness with spray foam at the underside of the roof as part of an unvented attic assembly will elevate such concerns.
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