Moisture at Ceilings

Moisture problems at ceilings are a common concern in residential and commercial buildings, and they usually often signal a problem that requires prompt attention. Stains, blistered paint, sagging drywall, and mold are typically indicators that water intrusion is occurring above the ceiling.

Several potential sources may cause ceiling moisture. Roof leaks, including flashing failures around roof penetrations or valleys, can allow rainwater to enter. In colder climates, ice damming may allow water to penetrate roof shingles. Condensate from air conditioning systems may drip onto ceiling materials. Inadequate attic ventilation can trap humidity, leading to widespread moisture damage in the attic and ceiling below. Plumbing supply leaks above ceilings are another possible cause of ceiling moisture. These are discussed in more detail in the tabs below.