Attic Condensation Problems With Closed-Cell Insulation

Identification

• Closed-cell insulation is typically made from polyurethane that can be sprayed or foamed into your attic or installed in rigid foam boards. This type of attic insulation has an R-value of R-7 to R-8 per inch, according to the U.S. Department of Energy. The R-value is the measurement used to determine how well insulation will resist heat transfer in and out of your home. Some of the most common problems homeowners face with closed-cell insulation are moisture problems and a loss in R-value, or thermal drift, that occurs over time.

Causes

• The winter months can bring condensation problems in your attic. According to Oregon State University, attic bypasses are passageways where warm air escapes from your indoor living space into the attic. Once water vapor seeps into an attic, it can become trapped and condense on surfaces such as insulation, pipes and ductwork.

Effects

• If your closed-cell insulation gets wet from condensation or other forms of excess moisture, mold may break out. Living in a home with mold growth is potentially hazardous to your health. Inhaling mold spores can cause symptoms similar to hay fever such as sneezing, itching eyes and skin rashes. Symptoms may also be more severe for those with asthma and other respiratory disorders. Wheezing, hives and difficulty breathing often stem from exposure to mold. Your attic may suffer structural damage from excess moisture and mold growth, requiring extensive repairs.

Considerations

• Be sure your attic is properly ventilated to reduce condensation and excess moisture. According to Oregon State University, all air bypasses should be sealed before installing your closed-cell insulation. Caulk around wiring, chimneys, plumbing pipes and air ducts for best results.