I will have my 25 years old concrete double garage floor replaced next week and the contractor told me that I will have to take care of the installation of a new catch basin for the floor drain.

My local store has various sizes of these basins in plastic (PVC ?) at about $36.00 and they told me that all I have to do is cut on the side of the basin the hole for the drain pipe and put silicone around the pipe; I asked a plumber how much it will cost me to have one installed and he said $320.00 + tax. I find this price reticular and I will attempt to do the installation by myself.

I cant see the drain pipe on my existing basin but I suspect that it may be concrete or cast iron and so I will get an adaptor and connect a small length of ABS drain pipe and then to the basin.

My question is: if there is no P-Trap on the existing installation, should I put one? Also just silicone around the pipe to connect to the basin is enough?

Thank you

 

KField, are you asking me to see post 23895,89176 in the Toilets, Sinks, Showers, Tubs & Disp. section?

How do I search for these posts?

Thanks

 

If you see no p-trap your system is probably hooked to a ground water system, you don't need one if that's correct.

Silicone should be fine.

Your other question about searching for a previous post, I don't have a clue

 

Thanks Shacko for the info, very helpful

Had a closer look at my existing basin and noticed that there is a trap. The pipe which comes thru the wall of the concrete basin (I think it is 4") has a T connected to it; One end of the T has a cleanout and the other end is pointing downwards with a 4" long pipe connected to the T. This part is submerged into the water and therefore acts like a P-trap.

Perhaps there is a name for the above kind of trap but I'm not a plumber and therefore dont know about it.

Much appreciated

 

What you describe sounds like a sand interceptor, if that was part of the original you probably need to copy the pipe lay-out.

 

You are right, it is a sand interceptor because at the bottom of the basin I have at least 6" of sludge.

But since part of the pipe from the "T" is submerged to water, it must also act like a P-trap to prevent odors coming into the garage. I plan to copy the layout as you suggest.

Thanks

 

Since I got not a really good info about this basin installation, I had a plumber yesterday to install the basin. All work would be soon under a 6” concrete floor and I didn’t want to take a chance

For the benefit of all members, I have documented the installation in a series of photos at:

Garage Floor Drain pictures by kolias - Photobucket