Which foam boards for zone 5 over sheathing of 1974 house
I have read thru many of the articles on adding 2-3 inches of foam over wall sheathing. All very good articles by the way. But I see different types suggested and get confused.
Originally I was going to go with EPS, but nobody in my area handles it.
I can get the EPS with the poly coating,Insulfoam being one brand.
I am comfortable with how to do it thanks to you guys on this site.
So should i use poly coated EPS? XPS? or Polyiso ?
The house, Zone 5, 2×4 raised ranch, fiberglass insulation between studs with poly stapled and taped and sheetrock , latex primer and paint.
If I have to, i will take down the sheet rock and remove poly and reinsulate. But would prefer not to.
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