Tub Rough Opening Too Big 60.7"

I am replacing a tub with same size tub. The rough opening width for my 60" tub should have been between 60 and 60.25, but it is between 60 5/8 and 60 3/4.

I see 2 choices:

A) Tub is already in the room but can still be shifted right and left. Most of the original drywall is still installed. To reduce wall width, I would either have to make a stub wall next to the tub or add material to that whole wall (including the door frame) to reach 60 to 60.25".

B) Can't I just split the difference and center the tub leaving 3/8 gap on each side. The 1/2 concrete and drywall board will still extend past tub edge by 1/8.

Which would u do?

 

I am assuming by drywall you will not be tiling the walls. The tub should be placed against the studs directly, and not on top of sheetrock or CBU if you are tiling. If you are planning on tile, you can double up on the tail side of the tub with CBU, making it another 1/2" thick, keeping the control end of the tub against the studs.

 

Thanks. Yes tiling. I meant CBU in tile/tub area and drywall outside of tub area.

 

If the tub has a flange, then it should be attached to your studs. It is 1/4" thick, so your CBU will come down and rest on that ledge, not on the tub ledge. Your tile can jump that gap and prevent water wicking up the wall at the same time. I would install one piece of CBU on the back wall to extend below the lip of the tub, then the final sheet will come down and rest on the lip. Hopefully that will take up your slack in the wall you need.

 

I have a kohler tub steel/porcelain tub that does really have a nailing flange. It's more of a slightly raised lip. I'll do the right thing, and add 1 layer of CBU/drywall to that whole wall.

 

Assuming yoiu meant does NOT above? Only way your statement makes sense.

It would be important to make sure that you are installing the correct tub. A tile flange keeps water from entering the wall cavity. Without, you would be relying solely on a bead of caulk to protect. This is not a safe long term option. The caulking will eventually fail.

 

Yeah, the new information makes it different. Can you post a picture of the tub and its edge?