How can I determine if the rough-in drain for the shower in the basement has a P trap installed beneath the concrete? The house was built in 1999.

Do this:

1. Take bucket of water
2. Remove drain cover ( if there is any )
3. Pour water inside the shower drain
4. Take flash light and see if there is water standing inside the pipe
5. Also, you can take stick and stick it in. Then pull it out. Stick should be wet about 4" high

If this is house built in '99 than there is a very good chance there will be trap below the concrete.

Let me know what you have found out... Milo

Milo - thanks for the info. It worked exactly as you described, so I believe there is a trap below the concrete. Thanks again.

Jim

Glad it worked out for you... Stop by if you need any other help with your project... Milo