Old roof is coming off (three layers of shingles). Roof deck is 3/4in x 7in planks with 1/4in spacing. Not planning on overlaying the deck with plywood.
Half the house has normal attic space with blown-in insulation, the other half has vaulted ceilings. In the summer heat just seems to radiate right through the vaulted ceilings into the home.
I have not torn off any shingles in the vaulted area yet to see what’s between the deck and the interior rock. Should I expect to see insulation?
Is there any kind of thermal barrier that could go down under the shingles? Is one layer of shingles going to allow even more heat to pass through than the three that was up there?