My shower stall has a 2" pipe for the drain, running into a 2" trap, etc.
It's 2" all the way. Anyway, I need to shorten the straight piece running
into the trap. The trap was set in a little low to the ceiling below. I want
to be able to give it a little more room. What should be the minimum
distance from the shower drain to the trap below? I know gravity does the
work, but I want to make sure the drop is sufficient for the water to run.
After looking at this thing a little more in depth:
I need to raise the trap about 1 1/2". If I shorten the straight piece by
about 1 1/2" then obviously it is not going to line up with the pipe going
to the sewer. Right now, the trap is perpendicular to the joist. So, there
is no room to add any type of fitting to get it to line up. So, my initial
though is to:
Turn the trap away from the joist enough to put two 45s in, they will have
about an 1 1/2" drop, and move horizontally enough to line up with the pipe.
Would this work, and avoid an S trap situation?
Technically, that may create a problem.
I'm assuming that the vent connection is further
downstream (sounds like).
The "trap weir" (the lower edge of the trap outlet)
must not be set higher than the vent connection
*inside* the TEE.
If the rule is not followed, there is possibility
of trap self-siphonage, although in a shower basin
it is probably unlikely.
GOOGLE: trap + weir + vent for more.
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