High-Density Polyurethane Spray Foam insulation
Photo: David Hamsley
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High-Density Polyurethane Spray Foam

The rigid, closed-cell structure makes it impermeable to water. Must be professionally applied. While not flammable, it must be protected with drywall or plaster to stop offgassing during a fire.

Good for: Masonry basement walls
R-value per inch: 7
Vapor barrier needed: No
Cost: 4 times the cost of fiberglass batts
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