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Discussion Starter #1
Have a new addition to a cabin and need to insulate the ceiling. Metal roof on purlins. 2 foot center ceiling rafter. want to keep area open, cathedral type. Will cover ceiling rafters with either drywall or probably some type of white paneling.
Should I use ridged insulation between the rafters or just staple fiberglass paper backing to the rafters like you would a wall, and fasten the paneling over top it?
 

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Just provide an air channel and dont let the insulation touch the roof if you staple up faced insulation,vent it along the eaves, maybe even vented ridge cap also.....
 

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Thanks Ron, we have a roof ridge vent on it. It's doesn't have to have a lot of insulation, place is heated with a wood stove. Just wanted some to help with drafts and keep the noise down some when it rains. Will probably go with R13 that's made for 2x4. I can't remember if it has 6 or 8 inch rafters so keeping it off the tin should be no problem.
 

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I know it won't help you since your roof is on but we put our insulation(rigid foam) between our perlins so we could leave the rafters and decking visible from the inside. Turned out pretty good.
 

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They make foam inserts to go between rafters that have ridges in it to provide air flow. With thos you could use 6 in insulation.
 

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Can put foam under the framing members, then drywall over it. Some builders are starting to insulate, run 2x4 horizontal framing over the vertical studs, then foam between the horizontals for more R value and sealing drafts. Look at Reflectix too.
 
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