Open and Closed Cell Foam

Home Inspector Lingo

Open cell and closed cell foam are two types of foam commonly used in construction for insulation, sealing, and other applications.

Open cell foam is used for interior insulation where moisture control is not a primary concern and is suitable for soundproofing due to its ability to reduce noise.

Closed cell foam is used for exterior insulation, roofing, and areas where a higher R-value is required and is ideal for use in basements, crawl spaces, and areas prone to flooding or high humidity.

Some key differences include open cell having interconnected cells, while closed cell has encapsulated cells, closed cells are denser with a higher R-value, offering better insulation, and closed cell being more moisture resistant.

Understanding these differences helps in choosing the right type of foam for specific construction needs, balancing factors like insulation efficiency, cost, and environmental conditions.


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