trap tailpiece minimum length

stevenrobertburke · Feb 8, 2011

Hi,
What is the minimum trap-to-vertical waste drop for a 2" tailpience?

We are in a tight situation for two separate situations. one situation is a shower drain, the other is a laundry drain. Both are 2" ABS and will be located in a crawlspace.i

Thank you, Steve

Jimbo · Feb 8, 2011

I don't think there is any minimum. You could have the trap arm parallel to and in contact with the base of the shower, sink, etc.

Sponsor · 2022-01-29T12:20:58-0800

stevenrobertburke · Feb 8, 2011

Thank you Jimbo,
My intent is to avoid an "S trap" Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?

Cacher_Chick · Feb 8, 2011

The limiting is the distance from the trap to the vent.

Shacko · Feb 8, 2011

stevenrobertburke said:
Thank you Jimbo,
My intent is to avoid an "S trap" Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?

If I read you correctly that IS a s-trap!

hj · Feb 8, 2011

quote; Is it ok to go from a 2" ABS trap to a 90 el (outlet is facting down) fitting into waste stack?

That is the definition of an "S" trap, so you would be creating one, not avoiding it. And the way you describe it, there might also NOT be a vent for the drain.

Jimbo · Feb 8, 2011

Under the UPC the developed length ( weir of trap to vent opening) minimum length = 2 X diameter.So your length can be quite short, provided it does not drop without a vent opening

trap tailpiece minimum length

Users who are viewing this thread

stevenrobertburke

New Member

Jimbo

Plumber

Sponsor

Paid Advertisement

stevenrobertburke

New Member

Cacher_Chick

Test, Don't Guess!

Shacko

Master Plumber-Gas Fitter

hj

Master Plumber

Jimbo

Plumber

Similar threads