Open-Cell Foam

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Open-cell foam is a polyurethane-based foam, that uses different Catalysts and Blowing agents, Typically water and not a manufactured chemical blowing agent. This chemistry is different from that in closed-cell foam which uses chemical blowing agents in them. all spray foams are polyurethane-based foam. Open-cell foam normally has an R value from 2.8 to 4.1 depending on the manufacturer's blend. Open Cell Foam is also called Half Pound Foam or Low-Density Foam.

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Open-cell foam has a lower R-value per inch than closed-cell foam, meaning it needs more inches to meet the state or local building code requirements. Open Cell Foam uses water as the blowing agent, although some blends vary depending on the manufacturer. Open-cell foam is softer and does not give any structural strength.  The spray applications are the same for open and closed Foam the technique might differ slightly. Open Cell Foam typically requires more labor for shaving and cleaning. This is required to allow proper installation of the sheetrock and to allow it to go onto the surface without popping the screws. Depending on the climate zone, Town and State Building Codes may need to be covered with an additional vapor barrier. Open cell foam is not considered a Class 1 Vapor retarder until you hit over 14 inches this is dependent on the manufacturer's testing. Open-cell foam will also allow moisture to travel through it, allowing wicking to occur with capillary action. It is never recommended to be installed on top of a concrete surface for that reason or in areas like dirt crawl spaces.

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Open cell spray foam insulation expands about 150 larger than its liquid applied coat and within 30 seconds has expanded sealing out air infiltration helping to keep your temperature more stable and constant thus helping reduce your heating and air conditioning monthly cost. many times you can also downsize the HVAC unit size saving you in the upfront cost.

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