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Sub Floor install for camper van

6.4K views 41 replies 22 participants last post by  Hein  
XPS Foamular 250 1” on Ford paint/metal ribs - no adhesive/fasteners/squeaks. Maybe I’m lucky.
Exactly the same here. 3/4" BB plywood floating on top of theXPS Foamular 250 1” . Both layers have (too much) clearance from walls. No squeaks. Will eventually be bolted through the floor. Not sure about if/how the gaps will be filled. Some have reporte good luck with Great Stuff, some have reported squeaks, guessing that might be due to bad adhesion?