[cirelo]

I am remodeling my bathroom, and installing a clawfoot tub. I am going to slope the floor and put in a floor drain as well. The drain for the tub and the floor drain are going to be 24" from each other, and I was planning to bring the two drain lines together using a 45 degree sanitary T.

I am going to use all 2" pvc, and I have very limited under-floor space, so my plan was to have both drains immediately go into 90's, and then connect them in the horizontal plane using the "T".

My question is if I need to have 2 p-traps, 1 for each drain, of if I can have 1 p-trap after the "T".

Also, how close does the vent line need to be to the drain, and to the p-trap? I will have to install a new vent line as well, and I am planning to use an air admittance valve because there is nowhere to go with the vent line.

Thanks in advance for the help!

[massplumber2008]

Hi Cirelo

Sorry, but you will need two Ptraps here.

You want to run an 1.5" drain over to the tub and keep the vent within 3-4 feet of the PTRAP.

For the floor drain, 2" is recommended and in many states this doesn't have to be vented, but I would check requirements of your state to be sure.

If you are installing a floor drain, you should probably also look into installing a TRAP-PRIMER... keeps the trap wet at all times. Here, I usually install the trap-primer under the vanity/sink and run the 1/2" pipe over to the PTRAP (direct connect).

More questions? Let me know, OK?

Mark

[Milo Dolezal]

In addition to Mark's advice, in my area, tubs require 2" trap and drain - but 1 1/2" vent. Definitely check with your local plumbing Code... Good luck with your project... Milo

[speedball1]

My concern is not with the traps, ( the tub requires one and floor drains have one built in)But the fact that you wish to use one drain for both fixtures. I can see future backups coming out of the floor drain. In my area floor drains do not require a vent and discharge into the main by themselves. Cheers, Tom

[puffmugs]

Check local plumbing code, in my area 3" is the smallest floor drain allowed ,1 1/2" is allowed for tub. If you don't have to be concerned with code, check Marks's and Tom's post, both are very good advice.