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Old 01-10-2015, 11:03 AM   #1
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Water trap in vent line


So im adding a small vented sink in basement. In order to avoid cutting big hole in joist i wrapped it under. This vent goes all the way out and through roof. Should i be worried about rain water getting trapped into this thing?
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Old 01-10-2015, 11:20 AM   #2
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Water trap in vent line


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Old 01-10-2015, 11:22 AM   #3
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Water trap in vent line


A vent may not drop in elevation or have pockets in them.

You can drill those joists with little worry. Just do not cut into the top or bottom cords.
Look along the joist to find the manufacturer's name. Then go to their website to find their drilling chart. You'll be surprised how big of a hole they'll let you drill....
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Old 01-10-2015, 03:17 PM   #4
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Water trap in vent line


Agreed.

Your local building and codes office may also have information on how to build an approved supporting structure (I.E. Plumbers box) if need be. My office here in TN was very clear about what needed to be done.

Good luck!
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Old 01-10-2015, 04:02 PM   #5
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Water trap in vent line


Pipe it in such a way to allow it to drain at all times. Condensation will block it as it is.
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Old 01-11-2015, 06:47 AM   #6
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Water trap in vent line


Basically while intent was there, the vent is not! Once a vent is manipulated in a manner which does not allow constant rise by 1/16"pfm it is "cut off" therefore non existent. You may be better off and much easier to just put a air admittance valve under the new sink.
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Old 01-11-2015, 02:38 PM   #7
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Water trap in vent line


Just run the vent to the other vent coming up the wall in the verticle. Tie in at that point so it is self draining.

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