Home>Discussions>PLUMBING>Connecting shower drain to existing (with trap) floor drain
4 posts / 0 new
Last post
missionmank
Connecting shower drain to existing (with trap) floor drain
missionmank

I'm trying to put a shower in my concrete floor basement.

The house was built in the 20's and sometime between then and now a previous owner installed a toilet and shower, traps and all. They did it right and the drainage works great but the shower they had just drained into the floor drain.

I want to put in a corner shower but that drain will be about 2.5 feet away from the existing one.

My question is this: what do I need to do to connect into the existing floor drain, which already has a trap, in order to make the drain for the new shower good?

I've put a picture of the area at the link below. I have taken out the "curb" that was around the floor drain for the previous shower. So it's all just flat there and the new shower will be going in about 2.5 feet to the right of the drain.

Thank you for any help!

https://www.dropbox.com/s/4zndaqa2v72lich/basement%20shower.jpg?dl=0

dj1
Re: Connecting shower drain to existing (with trap) floor drain
dj1

What you want to do is exactly what licensed plumbers do, and if you are not a highly experienced DIY, my advice is to get a licensed plumber. Call more than one plumber and compare bids. Check references carefully.

Basically, you will have to cut the concrete to allow trenching, you will have to cut about one square foot where the new drain will be, install a new trap there and run a 2" drain to the existing drain line. This new short drain must have an acceptable slope. In reality it's a lot more involved. You can read about it in publications, watch demos on youtube - and see if it's something you want to tackle.

All this work must be permitted, inspected and approved in my city. I assume that in your city as well.
A homeowner can do it himself in my city, but again, it must be permitted, inspected and approved.
An inspector will check all connections, ask you to run a leak test, check the drain slope, make sure you are using the proper materials, etc.

missionmank
Re: Connecting shower drain to existing (with trap) floor drain
missionmank

Thanks for the insight. I know that is the way (having a professional come in and do it) it should be done but I just don't have the money.

I will, though, be bringing in someone when I know that I have reached a point of not being able to do it totally right.

Thanks again!

Jack
Re: Connecting shower drain to existing (with trap) floor drain
Jack

Caution, the floor drain may be connected to the storm drain rather than the sewer line in which case the installation is illegal.

Jack

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.