Tips/tricks for vents in attic?

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Pghsebring

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Never had to combine vents in attic before. Always went straight out roof with one stack. Now i have 3 vents going up 3 walls i need to combine in attic. Any tricks to this? Is it as straight forward as it seems? Flip a sanitee over, make sure there's 1/4" pitch on the horizontal? Since i have 2 lines that need to come to the third one that goes out roof, how high above the joists would you put the first horizontal? A couple inches or a foot? I've never seen this done in person, just in books, that's why i'm asking. Anything i need to watch out for?

Thanks in advance.
 

Tom Sawyer

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Yea, they need to pitch back towards the drain(s) but not necessarily a quarter inch per foot. Just enough to make them drain. Most guys use upside down plastic J hangers. I like to use strips of 3/4 plywood with holes drilled in them.
 

Gary in NJ

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Also, the three vents do not need to connect at the same location.
 

LLigetfa

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Use lots of supports as the pipe can sag from the heat. I watched an episode of "Ask This Old House" recently where Richard had to redo a horizontal vent in an attic that had a sag which completely filled with water.
 

hj

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It is pretty much, "do it however it works best for you". There are few "regulations" regarding vents as long as they do NOT turn downward before connection together.
 
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