A homeowner complains of a musty smell in the basement after heavy rain but sees no standing water. What is the most likely cause and solution?
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A
Sewer gas leak — inspect and replace the floor drain trap seal
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B
Condensation on cool walls — install a dehumidifier and improve ventilation
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C
Subsurface moisture wicking through the foundation — improve exterior grading and downspout extensions
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D
A hidden plumbing leak behind the walls — pressure-test all supply lines