Venting question

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Venting question
Author: woodsf (MO) I am running a shower and a separate bathtub on a 2" drain line. The shower will be 2" all the way to the main 3" stack and the tub will be 1 1/2" tying down line into the 2" shower line. Can I use 1 1/2" to vent or does it need to be 2". Also do both fixtures need a separate vent or can the 2" cover both fixtures.
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Re: Venting question
Author: packy (MA) no way to answer that without seeing a diagram with distances noted. as a side note, i would not drain a tub into a shower drain. you are asking for a footbath in the shower when you dump a tubfull of water.
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Re: Venting question
Author: hj (AZ) all you need is 1 1/2" vent, but whether you need one or two vents depends on how you install the piping.
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Re: Venting question
Author: woodsf (MO) I should have stated this more clearly. The tub connects to the 2" line 7' past the shower and 6' to the main stack
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Re: Venting question
Author: hj (AZ) Again, whether you need one or two vents depends on WHERE you intend to put them.
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Re: Venting question
Author: mr leak (CA) One inch and a half vent is fine as you describe
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