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Old 07-08-2011, 11:42 AM   #1
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vents for plumbing (code) in Ca


So, if you have a house that is built in 1947 and it is a raised foundation and you are changing where the sink and tub went i have a question about the vents.
The toilet and 2 sinks are on one side and they hooked the sink drain to the toilet, ran a vent up to the ceiling into the attic and it doesn't go out to the roof yet. The shower already had a vent from the sink that was over there. Now, I am wondering if they will all connect and go out one vent or will the sink/toilet vent be expected to go out the roof? I am trying not to get taken here, because I will be very upset it this isn't done correctly...Can someone let me know how this should or could be done?

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Old 07-08-2011, 09:20 PM   #2
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vents for plumbing (code) in Ca


Not sure what California code is, but Oregon requires the same cross sectional area to be going out through the roof as what the minimum required building drain is.

For example, if you have a 3" drain, Oregon would require you to have either :

1 3" vent
2 2" and 1 1-1/2" vent

or any other combination where the area of each meets or exceeds the area of the 3" drain.

If your fixture load requires a 3" drain and you have a 4" drain, then you still go by the surface area for a 3" drain.

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Old 07-11-2011, 10:33 AM   #3
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vents for plumbing (code) in Ca


Thanks for your reply. I think what is going to happen is that the sink and toilet are joining together and going out the roof with a 4" vent. The shower is installed where the sink was so that vent will remain the same, it is some old cast iron job and think its 2" but can't swear, might be 2 1/2. I
just want to make sure stuff is done right on this job so that when I decide to sell I don't have to re-do everything since this area isn't the richest in town and most folks buying will be going FHA,,very picky about inspections!
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