Relocating kitchen sink drain

**tetra** · 25th May 2006, 07:32 PM

Hi, I'm planning on a kitchen renovation and would like to relocate the kitchen sink (therefore drain). The house is on a cement slab. Pardon my building ignorance but does this mean the drain pipe will be into the cement slab. Am I correct in thinking to chisel a "trench" across the room in the cement to run the drain pipe? How deep should the pipe be and any other considerations?
Thanks

**Pulse** · 25th May 2006, 08:12 PM

Can you run the drain in the 150mm kickboard space under the cupboards?

how far are you moving it?

**tetra** · 25th May 2006, 11:09 PM

No, I'm planning to pull the adjoining wall to the lounge down > making lounge bigger, and want the sink either on an island or across the other side of the room (no adjoining cupboards to present location).

**ausdesign** · 26th May 2006, 12:07 PM

If the cupbords butt up to an outside wall the waste will have to run through the inside of the cupboard. if not & you can't run back to the original waste pipe coming through the slab you have a problem.
You won't be able to 'trench' the slab. Besides getting through the reo which is somewhere around 25mm down unless you can keep the reo intact & thicken the slab under the pipe you'll be in more trouble than ned kelly.
The other option is to jack hammer through the slab, somehow feed a waste line from outside under the slab & membrane and hook up to it (missing the edge beam & any internal beams)
A redesign may be less stressful !

**tetra** · 26th May 2006, 01:34 PM

ok thanks, my rough design plan does have a big problem then. the new location for the kitchen is on other side of the room with free walk area in between. so cutting into the cement slab is impossible otherwise very difficult. one possibilty I think you are implying. I could cut a hole in bottom of outside wall in new location and run the pipe around outside to connect up. i'm not sure I can connect up to existing as thats under slab extending outside, but maybe hook it into storm drain?

**ausdesign** · 26th May 2006, 02:38 PM

If the new cupboard location is against or butts up to an outside wall, yes. Run a new pipe from the sink 'S' bend through the inside of the cupboard (with fall) & penetrate the wall. The line must be connected to the septic or sewer line - not storm water line !!

**thebuildingsurv** · 26th May 2006, 03:02 PM

I have seen new pipes put in via cutting the existing slab, a bit of a messy job. Redesign would be better. If your slab has no internal beams (check house plans if not to old) then a demo saw could probably do it no probs. It is not that rare of a job. speak to a plumber. It happens quite often in shop fitouts for resteraunts where new toilets or sinks are installed. tie some new dowels bars into existing and new slab mesh.

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