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Old 01-07-2015, 01:59 AM   #1
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Adding lav drain - vent needed?


For the existing setup shown in black on attached picture, can a lav drain be added at shown location in red? Does it need a separate vent line? Would I get away without a separate vent if the distance from trap to vent is less than 5' for 1 1/2" and less than 6' for 2"?
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Old 01-07-2015, 06:59 AM   #2
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For the existing setup shown in black on attached picture, can a lav drain be added at shown location in red? Does it need a separate vent line? Would I get away without a separate vent if the distance from trap to vent is less than 5' for 1 1/2" and less than 6' for 2"?
not sure of your location or what plumbing code you use....everything below the new lav you add would be wet vented..I personally don't like to wet vent but its done all the time and is accepted by some codes...to answer your question yes you could get away with it ..but ask your inspector 1st he is the guy you have to make happy .... looking at your layout 1 commode and tub is already wet vented....without adding your lav...
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Old 01-07-2015, 02:12 PM   #3
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You could do that but as soon as you pick up your tub you need to increase pipe size to 3 inch.
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Old 01-07-2015, 07:08 PM   #4
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You could do that but as soon as you pick up your tub you need to increase pipe size to 3 inch.
hey ghost ..am i reading this wrong..I thougth the stack going up was 3"from commode through roof..so his new lav would be 3x1 1/2 tee ...
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Old 01-07-2015, 07:12 PM   #5
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Then he is fine My bad
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Old 01-07-2015, 07:17 PM   #6
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Then he is fine My bad
not bad it dosen't say if its 3" or not ..Iam assuming it was ..maybe my bad
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Old 01-07-2015, 08:43 PM   #7
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not sure of your location or what plumbing code you use....
California

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You could do that but as soon as you pick up your tub you need to increase pipe size to 3 inch.
Sorry forgot to show, stack is 3" and then enlarges to 4 inch drain size between the two toilets.

Also, regarding the other question I had, is there a maximum distance I can have from the vent stack to the p-trap for the new lav?

Thank you guys, for your help!
Let me know if the info above changes anything.

Last edited by Jaxx; 01-07-2015 at 08:58 PM.
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Old 01-07-2015, 09:39 PM   #8
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The only problem i see now is he used wyes in the vertical placing his tub trap above the vent point. Illegal to do that here.

They would have to be a sanitary tee.
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Old 01-07-2015, 11:49 PM   #9
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You can put up to 4, 1 or 2 drainage fixture unit traps on a vertical wet. They must be on the same floor.
Since you have a shower on it that requires a 2" drain, the toilet vent must be 3"(one pipe size bigger than the drain served)
Where the horizontal trap arm connects to the vent stack you must use a san tee. Your drawing is interpreted as a wye
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Old 01-07-2015, 11:57 PM   #10
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And on a very basic concept level, one always wants air behind water so it can flow.
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