The ISLE Classic SUP is
an EPS foam board with the soft top you want.
Not exact matches
If
foam is more your thing, the California
Board Company SUP is made from almost all high - density
EPS foam.
The
board features an
EPS foam core wrapped in layers of fiberglass for strength without weighing you down.
The easiest way seems to be to put
EPS rigid
foam insulation
boards under the roof sheathing and above the rafters (open rafters, no drywall in ceiling).