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Old 04-24-2020, 06:06 PM   #1
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chimney leaks in rain, why?


All the screws are sealed on the outside with silicone sealant. Also, a bead of silicone on top that support piece that twists around the pipe. Pipes are installed in proper direction, so its not leaking in the pipe assemble joints. Every pipe seam in the garage drips water when it rains.

I cant figure out where it comes in. Id rather not get up there with a hose. It only leaks when there is a lot of rain. Either very hard rain or just a long rain.

Ideas?

tks,
pa
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Old 04-24-2020, 06:07 PM   #2
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Re: chimney leaks in rain, why?


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Old 04-24-2020, 06:22 PM   #3
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Re: chimney leaks in rain, why?


Just a guess, that stove pipe sure looks like it angles down toward the wall and there's no metal storm collar on the outside of the pipe.
Google it, lots come up.
It also looks like just single walled cheap pipe that can be a real fire hazard.
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Old 04-24-2020, 07:18 PM   #4
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Re: chimney leaks in rain, why?


not sure now a metal storm collar would help me. Water in getting inside the pipe before the thimble.
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Old 04-24-2020, 08:17 PM   #5
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Re: chimney leaks in rain, why?


My best guess is the adjustable elbow below the vertical stack. Maybe the joints, maybe where it connects to the horizontal duct.
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Old 04-24-2020, 08:39 PM   #6
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Re: chimney leaks in rain, why?


never thought it that. Ill ck it out. tks.
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Old 04-24-2020, 09:46 PM   #7
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Re: chimney leaks in rain, why?


I would replace the elbow with a clean out tee. Then you can clean it and if a little water gets in the pipe it won’t go in the building.
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Old 05-18-2020, 02:01 PM   #8
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Re: chimney leaks in rain, why?


fixed it. thanks all.


why a fire hazard?
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Old 05-18-2020, 08:27 PM   #9
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Re: chimney leaks in rain, why?


Flue pipe caused fires are often caused by insufficient support on horizontal sections. If the pipe falls apart from repeated expansion and contraction or if creosote flames up, the pipe can get red hot and the joints will expand and fall apart unless it is supported properly.

I don't mean to assume that your run isn't supported properly... just saying what I have been told. I have no idea what any code may be, but I'd want support within 4" of each side of a joint on any horizontal run.
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Old 05-18-2020, 09:59 PM   #10
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Re: chimney leaks in rain, why?


Quote:
Originally Posted by paulmars View Post
fixed it. thanks all.
why a fire hazard?
Two things:
How did you fix it?

And if that is single wall pipe it is a fire hazard.
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Old 05-18-2020, 10:45 PM   #11
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Re: chimney leaks in rain, why?


Im sure the lengthwise vertical seams are too tight to leak, but for some reason I installed the horiz piece with seam on top, so water was just sitting there. A bead of silicone fixed that.


the horiz slope is well above the min required by the codes. the operational draft is well within furnace spec.
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Old 05-19-2020, 02:13 PM   #12
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Re: chimney leaks in rain, why?


You are using non-stainless steel pipe meant to be used indoors only, outside. The joints that allow the pipe to swivel is allowing water in. Also the seams up the side of the pipe is a means for water to enter. I can see a sections where a pipe is slid into another, that is backwards and allows water to come past the joint. Tear all that out and use pipe that is rated for outdoor use. And then slope the pipe downward so water does not follow the pipe into the structure. And use double walled pipe and a pipe collar.
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Old 05-19-2020, 08:34 PM   #13
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Re: chimney leaks in rain, why?


"And then slope the pipe downward". That so wouldn't work. slope must be up. I think it was minimum of 1/4" per 12" length. Need that for draft.
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