Density- Mostly used for commercial rooftops Closed cell spray foam outperforms fiberglass, rock wool, and any other readily-available product on the market. The denser the foam, the more R-value ...

When it comes to shaping boards, the three main types of foam are Polyurethane (PU), Expanded ... any more wait than traditional polyester fiberglass resin, epoxy boards are favored in smaller ...

He cuts the foam into roughly the right shape with a hot wire. Clean up is done with sanding blocks, a plane, and a level. The next step is laminating the board with epoxy and fiberglass.