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Hi,

I'm currently weighing up options for caravan underside insulation.  The thermal foil stapled to the underside seems a fair choice.  Someone has even suggested screwing thin plywood sheets to the underside joists and filling in between with Rockwall.

Was just wondering about spray insulation foams, and if these could be sprayed onto the underside? Would they be prone to damp?  Perhaps polystyrene sheets could be used, but again, wonder how they might be affected by the elements?

Many thanks,

David>