WRONG!

[dsbike]

Originally Posted by ahicks

The nice thing about removing a vent completely to reinstall? You can frequently spot frames that are cracked, making them very difficult to seal properly.

Plastic frames like to expand and contract with temp changes. If they're installed securely to something that doesn't expand and contract at the same rate (alum, steel, wood) - you're eventually going to have cracks. No if's, and's, or but's to it.

Further, when replacing one of those cracked vents using today's sealants, you can use screws in half (or less) of the supplied holes in the perimeter of that new frame and it will be secured just fine. The screws you use don't even need to be tight. The plan is to leave that frame so it can expand and contract a little so it won't crack/break - then leak.

X2 I like the way you are thinking here. A lot of good info in a few short paragraphs.

[MSHappyCampers]

I can't believe this! It rained really hard last night and today my leak was still there! The water is dripping from one corner of the vent fan housing. I don't think there is any way it can be getting past all the sealing that I did, so it is either blowing into the top of the fan or coming in somewhere else and "migrating" to the fan housing!

Hopefully it will be dry enough I can get back up there tomorrow and look for another source for the leak!

[TQ60]

Look for a "ponding basin" or some spot that would allow standing water as thst allows it to flow uphill under the puddle.

Take a brush and brush off everything then using a bottle of water pour it around to see if any is standing.

A hair drier to warm it up may help get things to stick.

DO NOT apply any more sealer until you find what looks like the leak.

Also remove the inside trim to see if you can see a trail.