Spray foam

Spray foam is a commonly used insulation for a wide range of applications, from attics and crawlspaces to along side water supply pipes. Spray foam insulation is also strongly recommended when using geothermal heating and cooling in order to get the most out of your system. The benefits of a spray foam as compared to other types of insulation include quick application, ability to insulate hard to reach spots and resistance to diverse environmental conditions. There are two types of spray foam insulation known as open cell and closed cell. They differ in several aspects including densities. Below we examine the pros and cons of both types: Closed cell is more compact and also more common spray foam. The general measurement system for foam resistance to heat flow is called a foam’s R-Value. Closed cell foams have a higher R-value than open cell foams. Closed cell foams R-value is generally around 6.0 per inch, although some stronger ones can have R-values of 7.14 per inch and higher. In order to have such a high R-value closed cell foams are generally strong and dense. In fact they resemble solids when they fully form. This strength not only aids in insulating buildings but can also strengthen walls as well. Because of the high R-value closed cell foams feature better insulation and are also more resistant to water penetration. Closed cell foams are also compact enough to insulate air flow which prevents drafts and keeps temperatures regulated. This can also prevent mold growth because regulated temperatures can cut down on humidity. Open cell is less of a common spray foam because the R-values are a lot smaller than that of closed cell. The installation is similar to closed cell, but the effects are different. Open cell expands once it is applied which allows it to be installed in hard to reach nooks and crannies. This can include wall and ceiling cavities that can be difficult to seal with closed cell foams. Because of this expansion the area will be properly sealed and insulated. However, the R-value of open cell foam is lower than that of closed cell. Open cell is in the 3.6 to 3.8 per inch range. This means that it provides less strength to walls and its heat resistance level is lower which can cause insulation failures in extreme temperatures. Open cell spray foam also does not have water resistance so it is easier for vapor and air to penetrate. Because of the disadvantages of open cell in comparison to closed cell the cost is much lower. This can be a great advantage when the application does not require airtight seals and moisture prevention.

Establishing the insulation needs is very important before choosing which type of spray foam to use. Please feel free to contact us so that C&H Construction can help you determine which type of insulation is best to suit your needs.


C&H Construction is a licensed general contractor and Custom Home builder located in Blairsville, Union County Georgia serving Towns County Georgia, Fannin County Georgia, Gilmer County Georgia and the North Georgia Mountains.