Pros and cons of closed cell foam on roof deck, non-vented attic
Looking at re-insulating the house after significant remodeling.
I am North of Grand Rapids MI, north edge zone 5/ south edge zone 6 transition area. Roof is 7:12 pitch, truss construction.
I am interested in using closed cell foam directly on the roof deck. This would provide vapor barrier and result in the attic being conditioned space.
I was quoted 6″ minimum /7″ average closed cell foam on roof deck. Walls will be high density foam to R20
What are the pros and cons of this approach?
What do I need to watch out for?
I presume I may need to reevaluate the heating equipment (heat pump).
What risks am I incurring and what do I need to discuss with the insulating and HVAC contractors?
Objectives for this project are to make the home significantly more efficient and modernize to the degree I can afford. Planning to retire in the home, want to get the work done while I am working.
Thanks for any comments, this site has been an invaluable learning tool for me.
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