Hello,

I'm finishing off my basement and there is a 1-1/2 stub for a tub or shower. It holds water so I'm assuming there's a P trap in the cement floor and there's a vent stack nearby too. However, the stub is only 11 3/4 inches from a concrete wall and has cement all the way around it. My concerns are...

1- I've read that you usually need a square cutout in the concrete to facilitate the piping below the tub. Correct? What about a shower?

2- The stub seems close to the cement wall. Is there a standard, or typical distance, from the end of the tub to the drain? I'm thinking I may need to move the pipe unless I can find a shower or tub that will fit.

Thanks,

-r.

Rdot, the specific dimensions will depend on what type of bath fixture your installing. Most fiberglass tub/shower units are around 14-15" from the side to the center. I'm fairly certain that your drain will have to be moved farther away from the wall on either a shower or a tub unit.

On fiberglass tub/showers or steel tubs, you will need to have access under the slab to install a trap adaptor on to your 1 1/2" pvc pipe so that your waste and overflow connection will be low enough.

For a center drain shower unit, you will want to move the drain to fit your dimensions and make your glue joint connection on your drain stand pipe under the floor.

Your plumber should have made preparations by leaving some sort of square box in the slab. As it is, sounds like jackhammering is in the future.

1- I've read that you usually need a square cutout in the concrete to facilitate the piping below the tub. Correct?

A tub set up has a 12 X12 square cut in the pour for a tub dap-out.

2- The stub seems close to the cement wall. Is there a standard, or typical distance, from the end of the tub to the drain? I'm thinking I may need to move the pipe unless I can find a shower or tub that will fit.

You are already set up for a custom tile shower. If you install a manufactured base you will have to move the trap and raiser to fit directly under the shower base drain. Regards, Tom

Check out a product made by a company called Redi-Tile. They make custom floor plans for showers that can place the drain up to 6" away from the side of the pan. Their pans are pre-sloped, have curbs installed and are tile ready. Good luck

Skeeter

Thanks everyone. Between malex, speedball, and skeeter's answers, I have a much clearer picture now. It sounds like a little cement work with a hammer is in my future if a want a tub.

If you're installing a tub the general rough in measures are. 15 1/2" off the side unfinished wall and 1 1/2" off the unfinished front wall to the center of the trap raiser. Good luck, Tom

Thanks again Tom.

One last question, I know about setting the body of the tub in mortar, but I would also assume a pre fab fiberglass tub would be strengthened in the area around the drain that needs to float over the dap-out, or do I need to fill in the dap-out with some sort of material?

Quote:

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Originally Posted by rdot

Thanks again Tom.

One last question, I know about setting the body of the tub in mortar, but I would also assume a pre fab fiberglass tub would be strengtheden in the area around the drain that needs to float over the dap-out, or do I need to fill in the dap-out with some sort of material?

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The one thing I've learned about plumbing is that you can't "assume" anything.
Not all plastic and steel tubs are supported by the manufacture. Check before installing. You do not fill the dap-out area. Good luck, Tom