If you don't have HVAC and ducts in the attic, spray foam on the roofline isn't really necessary. I'd blow insulation on the attic floor (after air-sealing, of course). The big disadvantage with spray foam is cost. It's generally 3 to 4 times what you'll pay for blown cellulose or fiberglass.
Consequently, what is the difference between a cathedral ceiling and a vaulted ceiling?
By architectural definition, a cathedral ceiling is defined by symmetry with equal steeply sloping sides, meeting at a ridge in the middle of a room and normally mirroring the pitch of the roof structure. Vaulted ceilings, on the other hand, are not typically constructed using the same pitch as the roof.
Can you insulate roof rafters?
First, always place the insulation tight to the living space. The insulation should not be installed in the roof rafters unless the ceiling finishes are applied directly to the roof rafters. Unfinished attic storage areas are cold in winter. There is no advantage in insulating a cold attic from the cold outdoors.
What is Cathedral insulation?
The bulk of moisture moving into any insulated cavity is driven primarily by air. The Best Practice for building insulated cathedral ceilings is to create an airtight roof assembly. You have two Best Practice options: vented batt insulation and unvented spray-applied insulation.
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