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Old 11-26-2012, 12:01 PM   #1
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washing machine P trap and drain


Does the drain/standpipe for a washing machine need a p trap?

It appears the maximum height for the standpipe is 42"

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Old 11-26-2012, 12:06 PM   #2
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Does the drain/standpipe for a washing machine need a p trap?
Do you want sewer gases in the location of this standpipe?
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Old 11-26-2012, 04:44 PM   #3
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washing machine P trap and drain


Can the washing machine drain line be wet vented to the utility sink vent?
My utility sink has a dedicated 2" vent.

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Old 11-27-2012, 06:07 AM   #4
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Can the washing machine drain line be wet vented to the utility sink vent?
Provide a diagram of what you are proposing to do. Wet vented fixtures (toilet, bathtub, shower, or floor drain) are permitted for bathrooms on the same floor level, not between floors.
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Last edited by hammerlane; 11-27-2012 at 06:43 AM.
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Old 11-27-2012, 09:17 AM   #5
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I had the inspector out last week looking at the mechanical on my basement build out. I had him specifically look at the stand pipe and he told me that the standpipe did not need to be vented to above the sink drain as it is in the picture in the post up above. Don't remember his explanation.

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Old 11-27-2012, 10:19 AM   #6
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washing machine P trap and drain


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Originally Posted by Beepster View Post

I had the inspector out last week looking at the mechanical on my basement build out. I had him specifically look at the stand pipe and he told me that the standpipe did not need to be vented to above the sink drain as it is in the picture in the post up above. Don't remember his explanation.

B
I'm not following your comment. Any p trap needs a vent- whether its a common vent, wet vent, combination wet vent, etc. depends on the application.
A standpipe is simply an indirect waste receptor for the washer or an extended tailpiece- whichever you prefer to call it. Vents go downstream of the trap.
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Old 11-27-2012, 10:29 AM   #7
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The laundry sink vent will be the vent to the p trap.

I was saying my inspector told me I didn't have to branch off before the p trap drained into the vertical laundry sink drain and tie in above the laundry sink drain.

I specifically showed him the image in my previous post and he said that was fine.

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Old 11-27-2012, 12:37 PM   #8
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The laundry sink vent will be the vent to the p trap.....I specifically showed him the image in my previous post and he said that was fine.
I looked at the image in your previous post and I do not see any laundry sink stub out.
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Old 11-27-2012, 12:43 PM   #9
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I had the inspector out last week.....the standpipe did not need to be vented to above the sink drain as it is in the picture. Don't remember his explanation.
But there is nothing incorrect about the revent of the standpipe as shown in green in the photo. Also depends on the length of the branch drain...shown in red in the photo.
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Old 11-27-2012, 01:57 PM   #10
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Yes, the revent. I was saying that my drain (red line) was a short enough distance that I was told i didn't need the revent.

Yes, there is absolutely nothing wrong with the revent. Just extra unnecessary work.

I was only pointing out that the revent may not re required in all circumstances.

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Old 10-04-2013, 10:19 PM   #11
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Sorry for opening up this thread again after so long after the last comment, but I was wondering about the revent shown in the previous post photos. I was under the impression (and I certainly could be wrong) that normally the revent line needed to rejoin the stack above the height of the overflow of the fixure being served. (I understand that there are some exceptions for use in places like a island kitchen counter where other methods are used.) In the picture, it appears that the top of the washing machine standpipe is above the revent tie-in point to the stack.

As it was explained to me, the reason the revent line tie-in point should be above the overflow level was to prevent the revent line from becoming the drain line in the event of the actual drain line being plugged up at a point downstream from where the revent line ties into the drain line. If a plug occurred in this area, drain water would seek it's own level, and would flow up the revent line, across the horizontal portion of the revent line, and then down the stack to the primary drain.

Obviously if the revent show in the pictures is wrong, it might be possible to just cut it a bit off the standpipe and still be within the limits for the standpipe height and distance from the trap weir, and simultaneously get the standpipe overflow height lower than the revent height.

I guess my questions are:

1. Does the revent tie in point on the vent stack always need to be above the overflow level of the fixture it serves (except for the special cases like island kitchen sinks)?

2. Do different rules apply (or are different arrangements normally acceptable) for washing machine standpipes and revent lines?
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Old 10-05-2013, 01:24 PM   #12
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Where the vent ties in from the standpipe back into the vent stack is usually a minimum of 38 inches above finished floor or two inches above the flood level rim
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Old 10-05-2013, 02:13 PM   #13
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905.5 Height above fixtures. A connection between a vent pipe and a vent stack or stack vent shall be made at least 6 inches (152 mm) above the flood level rim of the highest fixture served by the vent. Horizontal vent pipes forming branch vents, relief vents or loop vents shall be at least 6 inches (152 mm) above the flood level rim of the highest fixture served.

So to answer your question the individual vent on the washer standpipe would be to low because it ties in below the flood level rim of the fixture served.

There is no such thing as a revent line.

Last edited by Ghostmaker; 10-05-2013 at 02:17 PM.
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Old 10-05-2013, 02:26 PM   #14
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905.5 Height above fixtures. A connection between a vent pipe and a vent stack or stack vent shall be made at least 6 inches (152 mm) above the flood level rim of the highest fixture served by the vent. Horizontal vent pipes forming branch vents, relief vents or loop vents shall be at least 6 inches (152 mm) above the flood level rim of the highest fixture served.

So to answer your question the individual vent on the washer standpipe would be to low because it ties in below the flood level rim of the fixture served.

There is no such thing as a revent line.
Is this IPC code... Here in Wisconsin it's a little different I guess (2" above flood level rim) but we're slowly starting to conform and probably going to adapt the IPC...
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Old 10-05-2013, 02:37 PM   #15
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See (15)(b)3.

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