Mixing EPS and XPS–zone 5
I am currently building a house in zone 5. On the walls, I am doing 2×6 with cellulose and 3″ of rigid insulation on the exterior. I couldn’t decide between EPS(cost effective) and XPS, so I purchase enough for 1.5″ layer of each. Since EPS is a little more vapor permeable does it matter if it’s the inside layer or the top layer? I do plan to have a house wrap on the outside of the foam.
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