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Old 03-04-2012, 11:31 PM   #1
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separate shower and bathtub drain


I am remodeling a bathroom by adding a bathtub. The bathroom has an existing shower drain. Can I hook up the bathtub drain to the shower drain? It would seem to me that with I drain the bathtub it would back up into the shower. If so, what are my options?

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Old 03-05-2012, 05:35 AM   #2
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separate shower and bathtub drain


Have you exposed the plumbing under the floor yet? We need to know what exists and where to give you any guidance.

Showers need a 2" drain--tubs only 1 1/2" --your existing tub drain pipe must be 2" in order to handle the new shower.

Also let us know approximate age of house and type of piping and drains.

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Old 03-05-2012, 06:25 AM   #3
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separate shower and bathtub drain


Provided the age of the home, you may also want to inspect the roof to see how many vent pipes exist. You may need to add one.

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Old 03-05-2012, 07:53 PM   #4
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separate shower and bathtub drain


depends on code used in your area but 1 1/2 can be used for shower even though i will not do it

http://publicecodes.citation.com/ico...017_par002.htm
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Old 03-05-2012, 08:27 PM   #5
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separate shower and bathtub drain


A 2" drain is good enough for a shower and a tub. My advice is to check if it is galvanized. If it is then tear it out while you are working on it and replace it with abs.
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Old 03-06-2012, 12:21 AM   #6
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separate shower and bathtub drain


My existing shower has a 2 inch drain with a vent and runs about 5 feet to the main stack. My orginal idea was to continue the 2 inch drain line to a new bathtub. I was afraid that when I drain the bathtub, it would back up into the shower pan since they are on the same drain line. I have come up with a way to make the bathtub have its own 2 inch drain line to the main stack so I should eliminate the posibility of backing up water into my shower.

Thanks for you help.
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Old 03-06-2012, 07:43 AM   #7
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separate shower and bathtub drain


The only way water would back up like that is if you have a galvanized drain system and the inside is all swollen and rusted, thus causing a restriction. I had that problem in my kitchen, i hit the garbage disposal and i had a fountain on the other side of the sink. Solution, replace with ABS

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