I am remodeling the master bath and I need to relocate the bath tub. I will be extending the trap about 3-4' from where it is now. I'm wondering if I need to relocate the vent pipe as well. How far can it be from the vent?
Plumbing – How far can I move the bath tub trap from the vent
drain-waste-ventplumbing
Related Solutions
Ideally, you should move the P-trap upstairs, and vent through the roof. Under no circumstances should you have two p-traps in one line. You get an air-lock between the two, and funny stuff happens.
You want something like this:
It's not going to be easy, but it's possible. The toilet drain pipe is going to be 3", and won't have a trap (since the trap is built into the toilet). The toilet will also only have a cold water supply. The tub drain pipe will likely be 1 1/2", and will have a trap. The tub will obviously have both cold and hot water supplies.
To switch the location of the fixtures, you'll have to reroute the plumbing for each to the new locations. Depending on the current location of the fixtures, existing plumbing, and the amount of access to the plumbing. This job could range anywhere from not so bad, to a complete gut and rebuild.
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Best Answer
It depends on the diameter of the trap. Under International Building Code use table 906.1.
A 1.5" trap can be 6 feet from the vent (if your trap is only 1.25" the maximum distance is 5 feet).
It looks like you should be fine in your situation.