Foam board insulation and vibration?
Hi folks, I'd appreciate hearing your thoughts on this. For my new van build, I was planning to do a floor of foam board (the 4x8 blue or pink stuff used in S&Bs), topped with 1/4" plywood, then sh...
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If this was my project, I would use Owens Corning FOAMULAR 250 XPS 1 in. R-5 Tongue and Groove Insulation Sheathing covered by 1/2" OSB. The FOAMULAR 250 has a compressive strength of 25 psi (3,600 # per square foot) compared the white styrofoam which is only 16 psi. Unlike styrofoam, XPS is virtually waterproof so it doesn't support mold growth. The 1/2" OSB provides a more solid base to attach furniture to and better weight distribution so you're less likely to get soft spots in foot traffic areas near entrance doors.
