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 DWV question
Author: bobby40 (FL)

Hello all. I have undertaken a difficult job (for me), replacing my homes entire cast iron dwv system with pvc. I am attempting to do this myself and at this point have the first bathroom roughed in. I am at the point of bring ready to back fill but want to have someone check my work before it gets buried. It is a horizontal wet vented system serving 2 lav sinks , 1 shower and 1 water closet. All horizontal pipe runs are at 1/4" per foot drop. The shower arm is in 2", the lavs//vent are in 3 and water closet is in 4".

My chief concerns are:

1. The shower trap arm measures 67" in developed length. I have seen codes that state 60"and 96" are maximum lengths. (different plumbing codes)

2. The shower tailpiece will probably end up at 20" in length (vertical) from the drain to the p trap weir. I believe this meets code but seems a bit long to me.

3. The shower trap arm has 2 horizontal 45 degree turns which should not be a problem but I would prefer not to have them in the pipe run.

Are any of these concerns valid?

Many thanks!

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Edited 1 times.

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 Re: DWV question
Author: bernabeu (SC)

yes

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 Re: DWV question
Author: packy (MA)

what you describe meets my code. (MA)

a picture or a rough drawing would help enormously.

the fact that you have 20 inches of height for the piping helps alot.
l
hint... if you have a 2 foot level, tape a small 1/2 inch block onto one end. use this with the block on the downhill side of the pipes and if it reads level, you have a perfect 1/4 inch pitch.

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 Re: DWV question
Author: bobby40 (FL)

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 Re: DWV question
Author: packy (MA)

the shower trap needs a vent.

you can cut in a "Y" down where the copper tubing crosses the shower drain.

look the "Y" straight up and put a 45 in it to come to vertical. go up about a foot and put a long sweep 90 facing to a wall. if you can use that new 2" vent as a lav drain, you will have a true wet vent.
the toilet flushing by the shower drain is apt to suck the seal out of the trap.

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 Re: DWV question
Author: bobby40 (FL)

I will see about placing a vent line on the shower arm. Do you see any issues with having those 45 bends? Seems like a snake should be able to make it past those pretty easy. Any concern with the tailpiece length? I think this may cause some noisy drain/dripping sounds after the shower is turned off, but I can live with that. Thanks for the advice.

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 Re: DWV question
Author: sum (FL)

As Packy stated your shower is not vented and it needs to be.

It would help to see where your lav drain and toilet is so the pros can see how they are connected. A picture showing the walls where the lav is and the toilet in relation to the shower will be useful in determining that. is the lav the fixture that has the vent through the roof?

I wouldn't worry about the offset (two 45s) in terms of easy of snaking. If your main line is clogged you will not go through your shower drain. If the shower drain itself is clogged you will use a small snake to clear it and it will have a harder time passing through the p-trap's U-bend then the two 45s downstream of it.

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 Re: DWV question clap
Author: bobby40 (FL)

I have added a vent to the shower as recommended here and removed those 45 bends while I was at it. Hopefully I have this correct now. Thanks for your help with this. Here is a drawing of the layout.

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 Re: DWV question
Author: bernabeu (SC)

looks good

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