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.