In Fine Home Building an article titled “Breaking the Thermal Bridge” caught my eye. The builder instead of applying foam sheeting on the outside cut strips of foam and applied them on the inside stud face. The foam was then covered with furring strips to allow for hanging drywall. The extra thickness allowed the builder to install higher R-value insulation. It seemed like an elegant, low cost idea that makes sense for my Florida fixer upper. The big question however, will it work in a hot-humid climate? As I reflected on the article I wondered how it would work in cold climates where foam covered walls alleviate the problem of moisture condensing out in the wall. Any thoughts?

I should have read the previous thread "wall stack up help". Thus it looks as though it will work. I've been trying to get the high density EPS type IV or IX which has a compression value of 25 psi. No one wants to sell only 10 sheets. I can get the Dow Syrofoam product with a 15 psi or R-Tech product at 13 psi. The question is will the 15 psi make for a plumb wall?

For a wall application either will probably work. The higher psi is important under footings and other locations where the standard might crush, but should not matter on a wall.