Mysterious Exhaust Vent on the Roof

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  #1  
Old 01-11-14, 03:40 PM
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Mysterious Exhaust Vent on the Roof

I was wondering if someone could help me figure out why I have an extra combustion exhaust vent on my roof.

What I know.
  • I have been on my roof sereval times and it is completely open at the top.
  • I cannot find a pipe that is connects to in the house. From what it looks like it is coming from basement area.
  • I did look out on a cold day and noticed heat coming from it.
  • My water heater goes out the main exhaust vent. The furnace we have is a new high efficeny one with PVC pipes going out the side of the house.
  • Both bathrooms and the dryer have their own vents.
I am very confused on what this vent is? Any ideas?

I have a picture attached. The vent is question is the one on the left.

Thanks!
 
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Old 01-11-14, 04:04 PM
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It's a plumbing vent stack.
 
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Old 01-11-14, 04:20 PM
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Without that vent the water would not be going down the drains.
 
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Old 01-11-14, 04:25 PM
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Oh, it would probably go down the drain, it would just go GLUG-GLUG-GLUG!
 
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Old 01-11-14, 04:34 PM
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And it looks like the boot isn't on right?
 
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Old 01-11-14, 05:14 PM
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Looks like it may have been leaking and a trim ring was added instead of having to mess with the shingles.
Turns an hour job into a 30 sec. fix.
Funny how I can find this common sense fix at my local hardware but not at the huge home center.
 
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Old 01-11-14, 08:04 PM
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I know the pipe on the furthest left, in the picture, is a plumbing vent stack, but is the stack more towards the top also for plumbing? I can see it is a fully metal pipe in the attic. I thought they only used PVC for that. I also noticed heat coming out of it on a really cold day.
 
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Old 01-11-14, 08:46 PM
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The vent is question is the one on the left.
Let me get this right. Earlier you said the vent in question was the one on the left, and you noted that your water heater goes out the main exhaust vent. Now you are asking about the one on the right?

It is your main exhaust vent, formerly used for both your water heater and your furnace, but now only used by the gas water heater... and yes, a gas water heater does give off some heat along with the exhaust. For this reason, the duct is metal and double walled.
 
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Old 01-11-14, 09:41 PM
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OK so forgive my horrible picture taking skills. I was trying to get a picture to show more of the roof hoping it make more sense. I guess that didn't work.

The vent I am questioning is circled in red.

I have done a ton a research and can't seem to figure out what it is. Is it another plumbing vent stack?

Thanks for the help!
 
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Old 01-11-14, 09:48 PM
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The vent I am questioning is circled in red.
We get that, and like we said, it looks like a plumbing vent stack to us.

I have been on my roof sereval times and it is completely open at the top.
Perhaps you should get on the roof again and take a closer picture. Smell it... it should be pretty obvious whether or not it's sewer or water heater. Hold your ear to it and have someone flush a toilet or run the nearest water. Maybe you have a dedicated vent for your water heater. Go in the basement and examine exactly where the water heater is ducted.
 
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Old 01-11-14, 10:37 PM
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That makes since. Once it gets a little warmer I will get back up there.

I have used this site for a ton of things since we bought our house 6 months ago. You guys are awesome. Thanks!
 
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Old 01-21-14, 09:16 PM
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The pipe I was questioning is a plumbing stack. The heat that I noticed being released was from hot shower.

Thanks for the help!
 
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