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Discussion Starter · #1 ·
Need a little direction here:

2x8 ceiling joist in a bonus room above a garage, located in Michigan.
want the highest R-value without building ceiling down.

was looking at closed cell spray foam.
--will 2 pound density break away over time (to rigid?)
--should i get 1/2 pound density?

Should i do splash and dash?
-- or will that create 2 vapor barriers?

seems like everyone has their own idea on rafter baffles with spray foam!
-- what does the roof shingle manufacturers have to say?

any other ideas???


Thanks for your help in advanced.
 
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