View Full Version : Pouring Concrete floor over ABS Drains?

12-30-2008, 11:35 AM
I am installing new waste lines with ABS in my basement as part of a new bath. I am looking for advice/guidance regarding making certain that the lines do not shift/settle as a result of pouring the concrete floor.

I am currently down to a clay/sand mix. I was going to lay a moisture barrier down, then gravel and then the concrete. I also have considerable water puddling in my dig area..

Any help is appreciated.. Thanks.

12-30-2008, 12:53 PM
Make sure you first get it inspected. Put the gravel down, then plastic barrier, and finally pour cement.

12-31-2008, 06:06 AM
You are supposed to pin, tie, or otherwise secure the piping so it CANNOT move once you have it in place.

01-01-2009, 09:10 AM
Any recommendations on best how to do that.. The soil is a clay/sand mix with lots of underground water. I have seen pictures with wooden stakes and metal strapping, but I don't really want to use wood as it will rot away and leave substantial voids.

I have been looking all over and all I can find for groundwork is a sandy bed with the pipe laid in the bed about 1/3 deep and then covered with gravel..