[newmanab]

Need a little direction here:

2x8 ceiling joist in a bonus room above a garage, located in Michigan.
customer wants 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.

 

[thom]

I wonder why a guy who's trade is insulator is asking these questions. Isn't it your job to know this?

 

[newmanab]

i do blown insulation only. no spray foam experience.

i am doing another section of the house with blow insulation

 

[dasooners82]

check with local codes to see whats required but 8 inches of 1/2 pound foam would be approximately r30 which would be plenty you may have to put a vapor barrier up on the inside

 

[genecarp]

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