ceiling baffles

Old 10-20-01, 03:45 AM
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I have a 2-by-8 cathedral ceiling to a shed roof that I want to insulate as much as possible without dropping the ceiling. I have bought a box of Duro-Vent baffles, which come in 22-by-48 sheets which can be split into 11-by-48s. My rafters are on 16-inch centers. When I staple these to the sheathing, should I butt the baffles end-to-end right against each other or leave a space? I looked at Pro-Vent, which is made of sheet plastic, not foam, and they recommend putting a one-inch space between each piece to allow for moisture release, but the Duro-Vent box has no directions. Also, since a 2-by-8 is really 7-1/2 inches and the baffle takes up an inch, my present intent is to use R-19 fiberglass batts and then one layer of staple-tab
Reflectix facing the "warm" side. Although this is far from R-38, do you think the combination will be adequate for a living space? Thank you in advance for your reply.
Old 10-28-01, 01:54 AM
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Addressing the space between baffles I would say no. There will always be a certain amount of heat loss through the roof causing some condensation to occur between the baffle & the sheathing. A space would allow this condensation to drip down into the insulation. As for insulation value, local codes call for insulation minimums. You mention R38, check the local requirements for your area. Here (South Eastern Ontario) a sloped ceiling calls for R28, which if you built up your rafters with 2x2 you could achieve.

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