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P-trap

15 years ago

Continuing saga of the bathroom reno.

Our exisiting tub has differnt dimensions than our new Maxx insert, and additionally we had to shore up the shower area wall with a new 2x4, adding some depth to the cavity. As a result of both of these things we have to move the drain 4 1/4" from where it was. The centerline (C/L) for the drain location is 16 1/4" from back wall and 7 3/4" off the side stud wall. Adding the 16 1/4" to the 4 1/4" given me a C/L of 20 1/2 for the drain.

What I'm curious to know is this:

Does the location of inlet to the P trap have to be a straight pipe from the outlet of the bathtub / shower? I'm pretty close to the joist on the right side and water supply to another bathroom makes it tricky. To make the location mentioned above I would need to use a 90* to clear an exisiting cold water pipe and then another 90* to get the flow going down again.

Comments appreciated.

Steve

Huntsville, Ontario

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Comments (3)

mijit
15 years ago
as long as the flow is eventually downward it makes no difference where the p trap is,it just blocks sewer gas from coming up the drain.
lazypup
15 years ago
QUOTE: "as long as the flow is eventually downward it makes no difference where the p trap is,it just blocks sewer gas from coming up the drain."

WRONG!!! i don't know what comic book you got that information from but the plumbing code says you can have no more than 24" vertical or 30" horizontal from the drain opening to the trap.

code also says the trap may be no closer than 2x the pipe diameter from the trap weir to the vent opening.
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mijit
15 years ago
what i said was clearly an exaggeration but from what steve said if he puts the trap as close the to the bathtub/shower as he can he will not be in violation of any plumbing code.if that were not possible though it would not be unsafe as long as he had a trap between the shower and the sewer.

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