Shower drain Help

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Old 07-31-20, 09:07 AM
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Shower drain Help

I am replacing an old cast iron flange with PVC. Found out I have ABS under slab. My issue is the amount of space I have to install new drain/flange. flange and coupling measure 6" I only have 5" to top of slab. What do I do????


 
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Old 07-31-20, 11:00 AM
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You can't use a PVC coupling to connect to cast iron. You will need a no hub coupling (rubber boot with metal shield around the outside) to transition between the two materials.
 
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Old 07-31-20, 11:16 AM
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It is ABS. The old flange was cast iron. once I opened the slab I found the ABS.
 
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Old 07-31-20, 12:44 PM
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How much pipe do I need (space) in between fittings? 1/2" 1"
 
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Old 07-31-20, 01:20 PM
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Slip the shielded Fernco stop coupling over the ABS until it stops. Then measure from the stop to the surface of your concrete and do the math.
 
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Old 07-31-20, 01:55 PM
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How much pipe do I need in between the fittings or can they right on top of each other??????
 
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Old 07-31-20, 02:19 PM
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It is not code to glue ABS to PVC. So you would not be using a PVC coupling... So your question is a moot point. You would be using a Fernco and i have no way of answering your question as I'm not there to measure.
 
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Old 08-01-20, 06:57 PM
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That is the bottom part of a multi part shower drain. It should be determined which level in grade. Set the flange you have with previously mentioned fernco couplings. You would then add a preslope to that drain body followed by the introduction of a shower pan membrane on top of the preslope - the membrane should extent 9 " up the wall and be folded over the curb so that there are no cuts that would cause leaks. Once completed a water test is performed and then a normal mudbed in installed to which tile is adhered to this.
 
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Old 08-01-20, 07:08 PM
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You can go one of two ways:
1) Stick with ABS. Get an ABS coupler, an ABS flange, and a couple inch piece of 3" or 4" ABS pipe. With a 5" spacing, your pipe will need to be about 4", but you'll have to measure to be sure or the exact length.

2) Convert to PVC. Same exact process, but use a no-hub coupler to convert from ABS to PVC.

BUT - is that a trap? There shouldn't be a trap under the toilet.
 
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