rexlion wrote:
Icynene is a type of urethane foam, but not dense so it could absorb water. Application of sprayed urethane is a pro job for someone with the proper sprayer and equipment, not really geared toward DIY, but it (the dense variety) is very good insulation.
EPS will work well too.
I assume you will attach the coroplast with hardware? Those sheets are tough to get glue to adhere... even the specially etched sheets.
Spray foam polyurethane is pretty much do it yourself these days. It might not be cheap depending upon how much area you need to cover but you can buy the kits at Home Depot and DIY.
DIY Spray Foam
