When a ceiling leaks during completely dry weather with no recent rain, the source is almost always an internal plumbing failure or condensation issue. Common culprits include a leaking supply pipe or drain line running through the ceiling or attic floor, a leaking toilet wax ring from an upstairs bathroom, a failing refrigerator water supply line, or condensation dripping from uninsulated HVAC air conditioning ductwork running through the attic space. Verification: Check upstairs bathrooms, plumbing lines, and HVAC ducts immediately to locate the internal water source.
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