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Old 04-13-2008, 05:53 PM   #1
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p traps and vents


from the top of the shower drain to the bottem of the p trap ....what should be the distance ?

i have a run thats 7-8 from the main stack on the main floor ...if i run 3inch do i still have to vent it

were can i find a site on do's and donts' for plumbing
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Old 04-13-2008, 08:03 PM   #2
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p traps and vents


Teebow:

"Tailpiece" from shower drain to p-trap should not exceed 24 inches.

Is this job being inspected..? If so, increasing shower drain line to 3" will probably not sway the local plumbing inspector....so at 7-8 feet from the stack, go with a 2" waste and an 1.5" vent within 5 feet or so of shower p-trap. If no inspection, may be able to pull off 7-8 feet ...BUT I THINK YOU ARE PUSHING IT!! and get what you deserve...

Anyway... let us know what you think.

Good night.
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Old 04-13-2008, 08:48 PM   #3
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p traps and vents


is there a mim lenth for the tail before the p trap?

so 3inch run for shower is a no no with no vent
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Old 04-13-2008, 10:37 PM   #4
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p traps and vents


A 3" drain from a shower is unconventional for sure, and is certainly overkill. I'd have to see it, but BP's right. The problem is that in order for the pipe to vent, the trap would have to be eliminated or sucked dry (gurgling drain anyone?). BP's advice of adding a vent is spot-on. As an inspector, I would not pass what you are describing TEEBOW.

If you insist on doing this yourself, I'd suggest you go to the local home center and get a book on plumbing basics. There are some good how-to books with lots of pictures, and they can be had pretty cheap.
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Old 04-14-2008, 09:51 AM   #5
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p traps and vents


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Originally Posted by TEEBOW View Post
is there a mim lenth for the tail before the p trap?

so 3inch run for shower is a no no with no vent
What you are describing to do with the 3" and no vent is a combo waste/vent system, and plumbers are only allowed to do it if there is absolutely no other option, and it is approved by the inspector or other authority having jurisdiction prior to installation. thekctermite is correct, the inspector would not pass in your situation.

You will never ever ever have to do this with a shower, because it is always situated on at least one wood framed wall.

I don't recall anything in the code about minimum length for a tailpiece...
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Old 04-14-2008, 11:41 AM   #6
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p traps and vents


after i strip the walls of dry wall to put up new cement board i found a vent pipe thats 1 1/2 inch thats only like 2 feet from my shower

so is that all right if i use that?
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Old 04-14-2008, 11:52 AM   #7
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Hey Teebow:

YUP!! That 1.5" vent pipe souns like it will be fine. Just connect the shower vent into it at least six inches higher than the flood level rim of the lavatory sink (I connect most of my vents in at 44 inches off floor (pitching back toward drain).

And the maximum tailpiece that is allowed by code in my areae is 24" maximum drop from fixture to p-trap (except for washing machine).

Good luck!!
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Old 04-14-2008, 01:06 PM   #8
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p traps and vents


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Originally Posted by TEEBOW View Post
after i strip the walls of dry wall to put up new cement board i found a vent pipe thats 1 1/2 inch thats only like 2 feet from my shower

so is that all right if i use that?
As long as it's actually a vent, and not a drain from a second story, that'll be perfect! Make sure you install your tee in the right direction !
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Old 04-14-2008, 04:32 PM   #9
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"and not a drain from a second story"

what would happen if it was?
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Old 04-14-2008, 07:09 PM   #10
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p traps and vents


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"and not a drain from a second story"

what would happen if it was?
I'm not sure mechanically what would happen, I just know that code says that no wet vent shall receive the discharge from a fixture on the second story.

Probably something to do with losing a trap seal on either or both of your traps on that line....
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