What kind of insulation do i need when remodeling?

Question

I am putting ceiling tiles stapled onto 1x4 furring strips and i have r-25 rolled insulation without a vapor barrier that is 8.5 inches thick.I had planned on laying the insulation between the rafters and then across the rafters the other way for a total of 17 inches of insulation which i have been told is more than enough.My concern is that there is about an 8.5 inch gap between the furring strips and i didnt know if that would be enough support for the rolled insulation.I had planned on putting up the insulation and then installing the tiles.Would it be too much weight on the tiles and make them bow over time?Should i have purchased it with a vapor barrier?Is a vapor barrier needed in ceiling insulation?

Update:

Thanks DIY the roof is less than 2 years old with 30 year shingles-i hope it outlasts me.

Update 2:

Thanks big dog i was worried that the 8.5 inch gap between the furring strips would put too much weight on the tiles over time.

DIYpro · Accepted Answer

As I understand it, you nailed the furring strips to the bottom of the ceiling rafters perpendicular to them? Then they will bear the weight of the insulation and the tiles will not be affected.

No, you don't need a vapor barrier. Just keep the roof in good repair so you don't get leaks. Getting water into that much insulation will be a mess!

bigg_dogg44 · Answer

ceiling insulation needs to be atleast an R-30, 91/2 inches thick......if u nailed the strips with # 8 framing nails or screwed them to the jois then they should hold up the insulation on them...

lic. gen. contractor

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What kind of insulation do i need when remodeling?

2 Answers