Will Foam Stop Basement Wall Condensation?

Identification

• According to the U.S. Department of Energy, adding foam insulation to your basement will reduce condensation on your basement walls. To prevent condensation, you must add foam insulation to exterior walls to avoid the formation of condensation on interior walls. Installing insulation to your exterior walls has a few other benefits such as protecting the damp-proof coating on your exterior walls, acting as a capillary break and saving space inside your basement.

Types

• Foam board insulation is one of the most widely used types of insulation in basements and attics. These are rigid panels that are filled with insulation material. Most foam board insulation is made from polyurethane, polystyrene or polyisocyanurate. Sprayed foam insulation and foamed-in-place insulation are also used on basement walls to reduce condensation. These types of insulation must be sprayed into the wall cavity, where the foam expands to fill empty cavities and provide thermal resistance. Liquid foam insulation is made from phenolic, cementitious, polyisocyanurate or polyurethane materials.

Installation

• Proper installation is the key to getting the most from your insulation. Foam board insulation is most effective when installed by a licensed contractor. Talk to at least three contractors and obtain written estimates. If you wish to do it yourself, contact your county building department to determine what fire and safety codes apply to the project. The Department of Energy states that spray insulation or foamed-in insulation is often difficult to install and may require special equipment, making it difficult for homeowners to do by themselves. All sprayed or foamed-in insulation must be covered with a thermal barrier approved by your local building department. Drywall is typically used for this purpose.

Considerations

• If condensation occurs frequently, it can cause your basement walls to become stained or discolored. Mold growth is also a common problem in basements with heavy condensation. If your basement has any mold growth, you must remove it to prevent damage to your health and your home. Scrub mold away with liquid dish detergent and water. If your walls are heavily stained, you may use chlorine bleach. Rinse the area and dry thoroughly.