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tms0501
Replace 30" tub with 32" tub
tms0501

I am in the middle of a master bath remodel and I am planning to convert from a 30" tub to a 32" tub. What do I need to do to move the plumbing (tub drain pipe and water supply lines)? The tub drain pipe is PVC while the water supply lines are copper.

dj1
Re: Replace 30" tub with 32" tub
dj1

More info is needed:
- Is the tub on a slab, raised foundation or second floor? The answer will determine what has to be done with the drain.
- If you move the faucet/mixing body, will you run into a stud? The answer will also determine if some framing modification will be required.

tms0501
Re: Replace 30" tub with 32" tub
tms0501

Thanks for the response.

The tub is on a 2nd floor (plywood subfloor) and everything is accessible. There is enough room between studs to move the lines if it's necessary. A mixing valve is in play here as well.

dj1
Re: Replace 30" tub with 32" tub
dj1

From your answer it looks like smooth sailing.

The mixing valve can be moved over by re-doing the copper supply pipes. Do you know how to solder well?

The tub drain goes into the vertical riser, this junction can be swiveled to align with the new tub hole. First, you disconnect the drain from the existing tub. Then cut under the junction. Attach a coupling, rotate the drain to fit. Keep in mind, that once you put glue (or cement, solvent) you only have seconds to put it in the right position. Moving it back and forth with the glue in it will weaken the connection. Let it dry and harden.

tms0501
Re: Replace 30" tub with 32" tub
tms0501

Unfortunately, I've never soldered before so I might need to get some help there. Thank you.

dj1
Re: Replace 30" tub with 32" tub
dj1
tms0501 wrote:

Unfortunately, I've never soldered before so I might need to get some help there. Thank you.

You may need a professional plumber to help you. Money well spent.

keith3267
Re: Replace 30" tub with 32" tub
keith3267

You are only moving the mixing valve one inch, the copper pipes will bend. The mixing valve should be mounted on a piece of 1x or plywood so you should not need to break any connections. The drain is pretty easy too, but if you have never glued PVC, but a few extra fittings and practice. You can use what ever type fitting you want for practice so get the cheapest ones for this.

HoustonRemodeler
Re: Replace 30" tub with 32" tub
HoustonRemodeler

Once the plumbing is handled and the tub is set, head on over to the John Bridge Tile Forum to learn how to properly waterproof the walls surrounding the tub. Ceement board + tile + thinset + grout is NOT waterproof.

Tell them we sent you.

dj1
Re: Replace 30" tub with 32" tub
dj1

From Keith: "You are only moving the mixing valve one inch, the copper pipes will bend."

Soft copper you can bend once or twice, but not unlimited times, back and forth. Soft copper is common under slabs, not in walls.

You can't bend rigid copper in short distances as in the supply to a bath faucet, or you will open the door to future trouble.

Also, even if you will be moving the faucet/valve 1", and in this case it will be more, bending the pipes will result in a crooked mixing valve or faucet body.

Again, get a plumber to do it. I've seen too many failures due to mistreating copper fittings and putting unnecessary pressure connections.

A. Spruce
Re: Replace 30" tub with 32" tub
A. Spruce

Since we're talking about 1", personally, I don't know that it's worth the effort of trying to move them. If you want absolutely perfect, then absolutely move them, otherwise, you're not likely going to notice.

Mastercarpentry
Re: Replace 30" tub with 32" tub
Mastercarpentry

You can usually get some movement without 'forcing' things and that's as far as you should go without altering the supply piping unless it's soft copper which it very well may be. It's more about the framing layout than the plumbing and should all be relatively easy to do other than the soldering, which takes a bit of practice to do well with. It's always worth getting a pro to do the stuff you're not confident about working with and since a lot of their cost is just to show up, sometimes it's better to let them do it all. Price it both ways and then decide.

Phil

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