Yes, a leaking bathtub overflow pipe can cause extensive and costly structural damage over time. Because the overflow assembly is concealed behind the bathroom wall and above the ceiling of the room below, a slow, unnoticed leak from a degraded rubber gasket or a cracked plastic pipe will steadily rot wooden subfloors, warp drywall, foster toxic mold growth, and cause ceiling collapses. Verification: Cut an access panel behind the tub wall or inspect the ceiling below during baths to check for hidden moisture.
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