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Old 08-25-2009, 11:28 AM   #1
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vents for what?


On the roof of my 3 storey building, there are two differnt kinds of vents scattered like shown in the pic below. The letter "O" stands for the little unbrella kind of vents, and i know that they are the drain stacks that goes thru the roof for kitchen and toilet.

The letter "J" stands for the vents in aluminum, that look like the up-side-down "J"s. My question is: What are the "J" like vents for? For plumbing? but there are only 2 plumbing stacks.

Thanks in advance.
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Old 08-25-2009, 04:21 PM   #2
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vents for what?


would they be for the excess heat to escape your attic & therefore unable to damage your roof when it builds up ? ? ?


Last edited by stadry; 08-25-2009 at 06:29 PM.
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Old 08-25-2009, 06:06 PM   #3
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vents for what?


That would be my guess as well. Since they appear to be spaced evenly and methodically, they are probably passive attic vents, and they are shaped like an upside down J so water and debris can't get in them. I've never seen venting like that though. It is usually a ridge vent, or a couple of larger round vents. I've also seen J vents like that for plumbing venting, but never attic venting, but I guess it is possible.
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Old 08-25-2009, 06:29 PM   #4
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vents for what?


pretty good guesser, huh, pank ? ? ? we've gottem on our house back in atl over the house's main 2-story part occasional water spots on the ceiling're testament to their effectiveness, tho


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