I live in Des Moines IA area and am getting ready to put a tub/shower combo in the basement. The drain for the tub was put in without thought to a shower/tub combo but rather just a shower pan. My question is since the drain is 24" from the framed wall on the right and 22" from the back of the wall can the p trap be put in where the concrete is cutout for the drain or does the p trap have to go directly under the tub drain cutout?

Thanks

Hi ESWAFF:

Technically, You will need to reduce the drain pipe to 1.5" and run that pipe so trap is under tub end with waste assembly...

Here, you need to chop out about a 12" square hole (6 inches left and 6 inches right of center of tub) in the concrete at the right or left hand end of the tub (where drain is)... and then channel that over to where the shower drain is.

The 12" square hole should be dug out to about 6-8 inches deep and then you want to connect the trap to the tub waste and overflow assembly you have connected onto the tub.

Otherwise, if you reduce the pipe from the shower ptrap and run only a pipe over to the tub waste you are creating an illegal trap and that can lead to siphoned trap and bad odors/poor drainage...

Let me know if need more info...

MARK