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Discussion Starter · #1 ·
So we're getting a ton of rain here in NJ, and when I went into the attic to check on an older (repaired) roof leak around where the furnace vent exits, I noticed a small amount of rain water seeping through one of the duct joints directly below. Enough has dripped down to make the plywood floor underneath a bit damp. It doesn't seem like rain should be able to get up and under the vent cap up top, but that's all I can think is happening. Note that the surface of the duct above the leak is dry.
 

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Can't really tell from pic, but it looks like water stains on your b-vent from above, could be the rubber gasket leaking around the roof vent. They don't last forever.

Another possibility, due to all the hard driving rain, rain could be getting in your vent cap and coming out. Seen that before to. Post a picture of your roof vent and chimney cap.
 

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Can't really tell by the pic. Use binoculars if you have them, If you can't get up on the roof to inspect vent. Imo, someone should actually get up there and inspect the whole roof vent really good. Especially the rain collar, chimney cap, and shingle area and re-caulk/seal it. See if that helps with the leaking. just a suggestion.

as you have mentioned, it's not really a big leak right now. But any leak will get big eventually. Hope you get it figured out and fixed soon otis.
 

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Discussion Starter · #5 ·
Thanks jmon. As much as I'd like to get up there and inspect it myself, the pitch is too steep for my comfort (or my gf's). But I did just look with binoculars. Nothing looks obviously wrong. I can see where the last repair was done--the guy used silicone around the vent right above the lower cap (where the blue arrow is pointing). Since I also noticed a little bit of dampness on the attic plywood beneath the white stack vent in the second photo, I agree that I need to have someone get up there and check both out.

What should I expect, ballpark, repairs to a leak around both vents to cost?
 

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Exactly. Right where the blue arrow is, very common to leak there, silicone probably needs redoing.. Same around the main sewer stack vent.

You are in NJ, so plan on 200-250 bucks for an inspection and sealing of 2 vents using a reputable roofing or building specialist. They will let you know if anything needs replacing.

You could probably get a handy man to do it for 150 bucks for a quick 30 minute sealing job using a couple tubes of silicone. if nothing seriously wrong, you will be good to go for another 5 years or so.
 
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