QueticoBill wrote:While we're on this, does the thickness of XPS - I think a full 3/4" but not sure - work OK with nominal 3/4" ply, usually a thirty second under 3/4"? I was afraid it could cause ply to bulge ever so slightly.
My first teardrop was stick-framed with an XPS foam core like you're talking about. I don't build that way any more, but that's another story! Yes, the foam does bulge a bit. You won't be easily able to glue the skins to the frame. You'll have to use fasteners (plus glue, if you want). But once the skins were assembled, you couldn't visually see any bulges or discontinuities.