Use these questions to decide which.
Insulating the underside of your roof.
Insulating the underside of roofs making the case for the unvented attic assembly background.
An unvented attic differs from a conventional vented attic in that there is no direct venting of the attic.
In some cases you won t be able to insulate the underside of the roof itself but rather the attic floor.
At the same time the areas below the roof benefit from increased comfort both during the winter and the summer.
If you re insulating the roof directly to insulate the roof itself you either use spray foam or retrofit with it with rigid foam board.
Is this a great room with a cathedral ceiling or an attic space with a floor.
Don t use spray foam to fix a roof leak.
But the best solution is actually to insulate both the attic floor and the underside of the roof.
Yes you can spray foam the underside of your roof.
In the winter your warm indoor air rises and will leave through the attic if it s not properly insulated.
Advantages of unvented attic assemblies.
When hvac equipment is in the attic insulation and.
An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore.
In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the rafters in the same manner you would hang drywall.
If so fix that first.
Then you could simply insulate the pitched roof.
You can then install.