Quote:
Originally Posted by bennelson
I haven't been able to find sheets of rigid urethane foam anywhere. The only thing I could seem to find for urethane foam was was either expanding foam in a can (Great-Stuff) or soft foam used for upolstery.
The idea of using rigid foam is that it's affordable, and easy to cut and carve into either large flat areas or not curvy parts.
Maybe I should price out soft yellow foam? I bet it could be put over some sort of framework, and then fiberglassed over, and have the framework removed.
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Polyiso foam is available at the local menards. It is light tan/yellow and has a foil facing on it. It is a bit more expensive for this vs extruded polystyrene, but you're not talking much for 1/2". I think my 1" thick sheets were $13. I don't know why I didn't think of that earlier when we were talking about this...
This is the stuff I'm using to insulate the bottom of my solar hot water tank:
