How thick should spray foam insulation be?

Spray foam is a good option to air seal and insulate your home. It is important that it is installed properly and in the correct thickness. The required thickness is determined by the area of installation and what you are trying to achieve.

If you think that more foam is better because the more foam the higher the R-value, this is a misconception. The combination of spray foam insulation’s R-value and its air sealing properties deliver an energy-saving punch. After you reach a certain level, adding more foam (and more R-value) there is no additional benefit.

Spray foam insulation is available in open cell or closed cell options. The R-value differs between the two types.

Open cell spray foam is soft with a lower density and has an R-value of approximately 3.5 per inch. It is usually installed in interior wall cavities such as attics, basements and crawl spaces. It also provides a good sound barrier.

Closed cell spray foam is a much denser and tougher product than open cell spray foam so the R-value is higher – typically within 5.0 to 7.0 per inch.  It can be used in attics and crawl spaces, but is more often installed in pole barns and commercial buildings due its durability and moisture resistance.

Make sure your home or business has the correct amount of insulation by contacting our professionals today.