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Old 03-28-2016, 08:16 PM   #1
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help with drain for a Tub going from 30" to 32"


Hi gang, I'm working on my 2nd bathroom, a DIY-er with a good deal of patience but no actual know-how. I need help with a tub.

The old tub was 30" wide, the new one is 32" wide. So I need to relocate the waste trap. The old one is a brass trap with no lateral adjustability, only swivel adjustability. It's also right against the floor joist (which is the ceiling in my kitchen downstairs).

There's also a closet BEHIND the shower fixture so I can put in an access if I need to.

I'm enclosing some photos below. Would love to get some advice on how to deal with the trap. It has to move some amount to the right in the pics below.

Advice will be useful even if it's just to get a proper job done by a professional. I will be getting inspections done on all of this work (including my own).

The first photos is the overall job. You can see the new Shower-valve installed. Behind this is a closet and I plan to put an access panel in there.

The remaining photos are close-ups of the trap and the waste pipes and "air" pipes.

The trap in the pic has a towel under it and some clear plastic as it leaked for a minute at some point. Hasn't leaked since I did this. Obviously this is temporary.

Thanks in advance everyone!
Attached Thumbnails
help with drain for a Tub going from 30" to 32"-floor_1.jpg   help with drain for a Tub going from 30" to 32"-floor_2.jpg   help with drain for a Tub going from 30" to 32"-floor_3.jpg   help with drain for a Tub going from 30" to 32"-floor_4.jpg   help with drain for a Tub going from 30" to 32"-floor_5.jpg  

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Old 03-29-2016, 12:58 AM   #2
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Re: help with drain for a Tub going from 30" to 32"


Can't see enough of what is under the plywood but I suspect you could remove enough plywood to cut out a couple of feet or as little as you can of the joist that has the trap coming through it. Free the trap from that piece and then where you cut the joist you need a double joist header, I think it is called, to be nailed to the joist on each side of the joist you cut out. Then do what you need to do to get the trap in the proper position to fit the tub Waste and Overflow. Then you need to fill in as close to the trap as will allow you to get a wrench or channel locks for tightening the slip nuts. Basically you need to beef up the area you have opened up to give it strength to support the Tub and water in it plus the weight of a 300 lb person. See drawing:
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