Venting question

Joeriley2005 · Nov 28, 2011

What is the code rule for horizontal members of a dry vent? Attached is a picture of what I'm faced with to use an existing roof penetration. I'd rather not punch another hole in my new roof...

Thank you for your advice,

Joe

Cacher_Chick · Nov 28, 2011

What you have drawn is fine.

Sponsor · 2022-01-29T12:20:58-0800

Jimbo · Nov 28, 2011

there are some technical limits, but you are not even close to any problem. make sure the horizontal section slopes back to the vertical stack.

Winslow · Nov 28, 2011

what size vent is this? That distance requires at least a 3" vent according to the UPC.

Joeriley2005 · Nov 28, 2011

It is a 2" pipe.

I thought the UPC Table 7-5 allowed 120 FT of total length for a 2" vent? I was just confused about the note: "Not to exceed 1/3 of the total permitted length of any vent may be installed in a horizontal position". I wanted to make sure it wasn't 1/3 of my total run.

Tom Sawyer · Nov 29, 2011

winslow, that's 119 inches not feet. 2" is fine

hj · Nov 29, 2011

I would have installed it without asking.

Winslow · Nov 29, 2011

Oh I thought it was in feet, was wondering what kind of a building it was. LOL

Joeriley2005 · Nov 29, 2011

Thank you to everyone with the positive input.

Winslow · Nov 29, 2011

The UPC says not more that 1/3 of the total allowable lenth (which is 40 ft). Some however interpret it to mean not 1/3 of the total lenth installed. Depends on interpretation of code officials in your area.

Venting question

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