Tub And Shower On Same Drain? - Remodeling - DIY Chatroom Home Improvement Forum
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Old 01-01-2014, 08:43 PM   #1
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Tub and shower on same drain?


Right now we have the worlds smallest master bathroom. No joke the thing is 5'x6'. We're about to embark on a full on remodel and make it nice (it's gross right now) and a little bigger. We'd like to take the tub/shower combo out and make it a shower. We'd also like to convert the existing "walk in" closet (that is right on the other side of the wall) into a tub area (removing the wall in between). We have a concrete slab as a foundation and I'm wondering if we cut the concrete, can we tie the new tub into the existing tub/shower drain. Or would we have to cut the concrete from the new tub all the way through the house into the front yard where the septic tank is.

Any ideas? We're in Florida if that helps for codes etc.
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Old 01-01-2014, 09:56 PM   #2
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Tubs often have 1 1/2" drains---you need 2" for the shower---and 2" for the tub,by todays code---under slab piping must be 2" or larger.

A licensed plumber will be along soon to give you the specs--Mike----
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Old 01-01-2014, 10:52 PM   #3
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You can put both- a tub/shower and a shower on a 2" line as they will not go over the drainage fixture unit allowance for a 2" horizontal drain line. So if you only have a 1.5" serving the tub, which is quite possible, you'll need locate a larger line under the slab or take it out to the sewer line.
You will also need to provide venting for each trap
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Old 01-12-2014, 10:19 AM   #4
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The original bathroom has a tub/shower combination. The home was built in the early 90's. Is it likely that it's already got 2" under slab? I know you can't see it through my computer but if it's already a tub/shower combination, what's problem with just separating out the shower from this, putting a shower in a different area of the new bathroom and tying it into the existing pipe under the slab where the existing tub/shower is located? It's the difference between cutting the concrete for a total of 6' across the bathroom (that is getting new tile anyway) vs cutting the concrete from the back corner of our home all the way through the entire house out to the septic tank in the front yard.
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