My South Window in My House Is Leaking Rain

Causes

• South-facing windows may leak rain water if improperly installed during construction. Homeowners may not realize this problem until seasonal rains begin. Poorly fitted windows often have gaps that are left unsealed, where water can trickle inside. Gaps or holes underneath the window sill may also allow rain water to come inside and cause moisture damage.

Effects

• When your windows are leaking, it can cause your walls to become discolored or stained. Many walls turn yellow or develop brown stains from moisture damage. Indoor humidity levels will be higher in your home when moisture is seeping inside. The combination of higher humidity and constant moisture increases the chance of mold growth in your home. Mold grows rapidly in areas that have a steady supply of moisture. Over time, mold growth can damage your home and make repairs necessary. Certain people are highly sensitive or allergic to mold and suffer serious health problems after exposure to mold spores.

Solution

• Examine your south windows to determine the source of the leak. If your windows are not properly installed, hire a contractor to repair or replace your windows. Gaps underneath your window sills can be sealed with caulk to keep rain from running inside. The United States Department of Energy recommends using a water-based foam sealant to seal gaps around windows.

Considerations

• Once you have repaired your water leak, you must examine your home for signs of mold growth. If you can see or smell mold, you must remove it to avoid further damage to your home and potential health problems. Remove mold with a scrub brush, liquid dish detergent and water. Once you have scrubbed the mold away, rinse and dry the area. Consider placing weatherstripping around your windows to reduce the risk of leaks and to keep air from moving in and out of your home.