Dear James: I have recently noticed a damp spot on the ceiling beneath the shower stall. My house is only three years old. What is the cause and how can I fix it?—Nicholas D.
Dear Nicholas: For a house that is only a few years old, a faulty waterproof membrane under the shower is the mostly likely cause of the leak. You probably didn’t even know that a membrane is installed underneath under the shower stall during its construction. Poor membrane installation procedures are often the culprit.
