Spray foam insulation is a liquid latex or polyurethane foam that expands and hardens to fill gaps. For large insulating jobs, professionals spray this insulation into place with special equipment. For small sealing jobs, spray foam is available in spray cans.
Best for hard-to-reach or oddly shaped areas and already insulated areas.
Can be used to fill small gaps and cracks or to insulate large spaces.
Ideal for sealing around doors, windows and vents.
Sets quickly and can be trimmed, painted or stained.
Has two types: open-cell foam and closed-cell foam. Closed-cell foam is denser and thus has a higher R-value. Closed-cell foam is usually more expensive than open-cell foam.
Open-cell foam has an approximate R-value of R-3.7 per inch of thickness.
Closed-cell foam has an approximate R-value of R-6.2 per inch of thickness.