I used a combination of board foam and spray canned foam (doesn't add that much weight) and Reflectix bubble-pack foam from Lowes. There are two kinds of spray-on foam, Closed-Cell and Open-Cell. Closed-Cell foam is high density, rigid foam when cured. Open-Cell foam is lightweight, flexible and carries the same properties as cellulose and fiberglass insulation when cured. The Dow Chemical Great Stuff Cracks and Gaps Foam Insulating Sealant is closed-cell, dense, rigid foam, paintable, sandable. The Dow Chemical Great Stuff Window & Door Insulating Foam Sealant is an open-cell, lightweight, foam. Both are moisture and air-migration resistant. Closed-Cell foam has twice the R-value of Open-Cell foam, which is why you need the Reflectix to add to the R-value seal it all in.
So am I supposed to use the closed or open cell foam around the blue boards?