Because spray foam insulation applied to the underside of roof sheathing inhibits heat conduction.
Spray foam insulation on roof rafters.
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Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly.
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.
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.
In an uninsulated attic the heat passes through roof sheathing and disperses into the attic space.
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Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof.
It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.
Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space.
All insulation materials require proper venting.
The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.