What Is the Difference Between Open-Cell and Closed-Cell Spray Foam?
Open-cell spray foam is generally softer, less dense, and more permeable to water vapor.
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Plain answers to the questions homeowners and building owners ask us most.
Open-cell spray foam is generally softer, less dense, and more permeable to water vapor.
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Residential spray foam insulation is a type of insulation applied as a liquid that expands into a foam, creating an air-tight barrier. It is used in walls, attics, crawl spaces, and other areas to improve energy efficiency by reducing air leakage.
Spray foam insulation expands upon application, filling gaps and cracks in building materials. This creates a sealed layer that helps prevent air movement, improving thermal resistance and moisture control.
There are two main types: open-cell and closed-cell spray foam. Open-cell is less dense, offers sound dampening, and is typically used in interior applications. Closed-cell is denser, provides a higher R-value, and adds structural strength and moisture resistance.
When installed properly by trained professionals, spray foam insulation is safe. It should only be applied with appropriate ventilation and protective equipment during installation, as the chemicals used need time to cure.
Spray foam insulation can last over 20 years without degrading when properly installed. It doesn’t sag or settle like traditional insulation materials.
Open-cell spray foam typically has an R-value around 3.5 to 3.7 per inch, while closed-cell spray foam has an R-value of about 6 to 7 per inch. R-value indicates thermal resistance; higher values mean better insulation performance.
Spray foam can be applied in attics, walls, basements, crawl spaces, rim joists, and around windows and doors. It is suitable for both new construction and retrofit projects.
Yes, spray foam insulation improves a home’s energy efficiency by reducing air leaks and maintaining indoor temperatures. Homeowners often see noticeable reductions in heating and cooling costs.