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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?

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up vote 4 down vote accepted

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.

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Thanks! That is what I was looking for, it written in code! – SteveR Feb 11 '12 at 14:06

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