Cement Basement Wall Problems

Condensation

• Damp walls or mildew may be an indication that your basement has condensation issues. Excessive humidity in the air causes condensation. Typically, condensation forms on cement basement walls from an internal source such as a basement shower, a washing machine or an unvented dryer. This causes a significant difference between the wall temperature and the interior air temperature in the basement. Test for condensation by taping a mirror on the dampest spot of the cement basement wall and waiting for 24 hours. If the mirror fogs or beads water, it's a sign of condensation. Installing a dehumidifier will improve the ventilation in the basement.

Seepage

• If you notice dampness on a section of the wall, typically near floor level, seepage may be the culprit. Surface water forces its way through the pores in the basement foundation, or the expansion joint is causing seepage on cement basement walls. Seepage commonly is formed due to poor drainage, or a leaky basement window well. To test for seepage, tape a mirror on the basement wall and wait a day or two. If moisture condenses behind it, you have a seepage issue. Waterproofing the outside of the basement foundation or replacing the basement window well repairs it.

Leaks

• If the basement contains localized wetness during a heavy storm, the basement walls may contain a leak. Check the basement walls for cracks running horizontally, and check for a faulty roof drainage or a slope grade running toward the home. These could all cause cement basement walls to leak. Test for leaks by running a hose outside near where you noticed the cracks in the walls. If water enters the basement, you have a leak.

Temperature

• Basement cement walls create a cool temperature. If your basement simply brings chills down your spine, you may want to insulate the walls. Insulating the basement walls not only helps control the basement temperature, but it can also bring down your heating and cooling costs, helping to keep the basement drier. It's important to keep materials away from the cement walls by building a stud wall cavity because of the natural moisture in cement. Insulating the basement will create an enjoyable environment for years to come.