When you’ve got a leak in your bathroom fan duct causing ceiling water damage after rain, it’s usually a sign that something’s seriously off with the duct connection or vent setup outside.

Alright, so here’s the deal: that duct absolutely should be connected tightly to the fan housing because if it’s hanging loose like you said, rainwater can sneak in at those gaps and eventually drip down into your ceiling. You wanna first replace that old flex duct with a new, rigid or at least higher-quality insulated duct, flex duct can sag and collect moisture, making leaks worse. Also, check the roof vent cap where the duct terminates because if that vent’s cracked, missing a cap, or not sealed right, rain will pour in during storms. Sometimes adding an elbow or a bend in the duct near the roof vent helps deflect rainwater away from the opening. If the vent on the roof isn’t new or got damaged, it might need replacing even if your roof itself is only five years old. Another option is to reroute the vent to the side of your house instead of through the roof, it can be easier to maintain and less prone to leaks. Don’t forget to seal every connection point with high-quality waterproof tape or mastic sealant designed for ducts. And make sure the duct is properly supported so it doesn’t sag and pull loose again. Finally, confirm that the vent on the exterior is the right type for bathroom fans since some vents aren’t built to keep out wind-driven rain.

One of the biggest mistakes people make when dealing with bathroom fan leaks is ignoring the duct connection altogether, if that duct isn’t firmly connected and sealed to both the fan and the roof vent, water’s gonna find its way inside. Another common issue is using old or cheap flex ducts that sag or crack over time, which makes leaks worse and airflow inefficient. Lastly, many folks don’t check or replace the roof vent cap, assuming it’s fine just because the roof is new, but vents can get damaged independently and cause leaks. The fix? Tighten up all connections with proper sealants, swap out busted flex ducts for sturdier ones, and replace any worn or cracked vent caps with weatherproof models designed for bathroom exhausts.

BigHomeProjects.com is a solid spot to help if you want to find trusted local contractors who know how to handle these kinds of pesky home repairs without breaking the bank. And if you’re a contractor looking to get more work in your area, they’ve got a great platform to connect you with homeowners ready to get their projects done right.

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