Polyiso / spray foam / insulation / paint?
I hate to continue asking what seems to be a different wording of the same question but bare with me. My house is 2x6 exterior walls, 1.5 inch of polyiso rigid fiberglass faced foam outside the sheathing and Tyvek. We are in the 47460 zip.
I would like to know the best way to achieve the tightest wall possible but still allow my sheathing to dry accordingly. 1-2 inches of closed cell in the stud void is something Dana said would be OK, so I am leaning towards that but want to be 100% sure it's OK.
Second question is....have I severely limited my options for types of paint on the drywall since I used the polyiso outside the house? I am wondering what type of interior paint is safe to allow my walls to dry correctly.
So re-cap.....can I flash the sheathing in the stud voids with 2 inches of closed cell foam for a complete air seal....OR am I better off with just doing the wet sprayed cellulose and hoping that the taped seams of the polyiso have done a good air-sealing job?
I would prefer to use the wet sprayed cellulose on top of the foam instead of batts because of the labor time and cost. I can have cellulose sprayed in for .80 cents a ft compared to batts at .32 cents for material then I need to install them myself. My time is worth more than .50 cents a ft so the cellulose wins.
Posted Aug 20, 2014 2:21 PM ET
Edited Aug 20, 2014 3:01 PM ET
Other Questions in Energy efficiency and durability