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Thanks Bob for the great advice! I never thought of doing both "against the panel" + "cover ribs with air gap".  For the single layer approach I was thinking 1" for the wall and 2" for the ceiling.  If I go with this "both" approach, what is the thickness of polyiso you'd recommend for the wall...

Thanks Joe! I was thinking something similar to your idea.  I was wondering if I should put something between the side rails for a little more support, like additional rails made of polyiso strips.  Or plywood coverage on top of it may be enough for support.  A lot to think about but it's fun :)

Hi! We got our first van 2016 ProMaster and just started the simple conversion project so that we can bring the van to camping and surfing. We just finished sound dampening and about to start insulation.  As we live in northwest, the main concern is keeping the heat in, but it would be nice to...