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Two additions on our house have open rafter ceilings; that is, the rafters (beams) and the roof decking are visible from inside the room. While we enjoy the look, there is virtually no insulating value to the roof. Consequently, it costs alot of $$$ to heat and cool. Is there any way to add some R value to the roof without ruining the look. One contractor suggests adding a material called Tectum to the inside of the room. This looks like an extra thick ceiling tile made out of recycled material. This would only cause us to lose 3-4 inches from the inside of the room. I don’t know if this will cause premature wear on the overlying roof. Another suggestion was to remove the existing shingles, lay down insulating board and a new roof. I’m not sure whether I would gain much in the way of R-value and I am concerned about how the shingles could be nailed to insulating board. Sandwiching the insulating board between two layers of decking could work, but the premature wear issue still concerns me.
Any suggestions?
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I had same problem and about 15 years ago I sprayed urethane foam on the outside. Cured my problem but now it is time to do again as I didn't have the right coating on the foam. If you put 4 inches on there you get a good enough r value to pay back. And remember for each additional inch or incremental increase in R value, the payback gets longer and at some point will never pay back. Of course there are considerations besides the financial payback.
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How do you attach new roofing to urethane foam? How much foam would you need to cover a 36 x 12 roof?
*tear off the old roof install three inch ISO board( three inches of foam board .5 inches air space .5 inches plywood) has a r value somewhere in the 20's reshingle and you are all set. ISO comes in all types of r values check your local roofing supply center.
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Two additions on our house have open rafter ceilings; that is, the rafters (beams) and the roof decking are visible from inside the room. While we enjoy the look, there is virtually no insulating value to the roof. Consequently, it costs alot of $$$ to heat and cool. Is there any way to add some R value to the roof without ruining the look. One contractor suggests adding a material called Tectum to the inside of the room. This looks like an extra thick ceiling tile made out of recycled material. This would only cause us to lose 3-4 inches from the inside of the room. I don't know if this will cause premature wear on the overlying roof. Another suggestion was to remove the existing shingles, lay down insulating board and a new roof. I'm not sure whether I would gain much in the way of R-value and I am concerned about how the shingles could be nailed to insulating board. Sandwiching the insulating board between two layers of decking could work, but the premature wear issue still concerns me.
Any suggestions?