Need to move kitchen plumbing in slab

[KristinT]

Our kitchen plumbing was housed in a knee wall in our kitchen island. We removed the knee wall so we gain that 4-1/2 inches and add cabinets to the other side of the island. Now we want to move the pipes and drain under the slab to come up directly under the sink.

We just finished the demo and can see where the copper pipes come out of the slab. The house was built in 1985 with standard slab, not a post tension slab. We want to cut a trench in the slab to bury the pipes under the slab instead of having them run through the inside of the cabinets. See picture where they extend is where they ran thru the knee wall.

Is this a possibility? Will it meet code to put these pipes under the slab and have them come up directly under the sink?

 

[MACPLUMB]

Yes you can run it under the slab, but you want to do it in soft copper, so no joints under the slab, you tee off in the wall where it is now and roll
under the floor back up where you want it under the sink

 

[Sponsor]

 

[KristinT]

Yes you can run it under the slab, but you want to do it in soft copper, so no joints under the slab, you tee off in the wall where it is now and roll
under the floor back up where you want it under the sink

Thanks for such a quick reply. One more question, we also wanted to put a cabinet where they currently come out of the slab, so we had hoped to bury them completely from that location and bring them up under the sink. But from what I understand, you are saying we cant have any joints under the slab, these pipes have to stay where they are and the tees have to be above slab only. So theres no other alternative? Where they come out of the slab is permanent?

 

[Jadnashua]

The floor of the cabinet doesn't go all the way to the floor...IOW, there's space underneath the cabinet to make your needed connections before it then goes under the slab.

 

[KristinT]

The floor of the cabinet doesn't go all the way to the floor...IOW, there's space underneath the cabinet to make your needed connections before it then goes under the slab.

Great point, I didn't think of that. thank you so much for taking the time to share your expertise.

 

[MACPLUMB]

Remove the Existing water pipes, tee off in the wall "NOT" under the cabinets, you want one solid water line from in the wall up under
where the kitchen sink will be ! The less joints then less likely to have a leak where you can't get at it !

 

[KristinT]

Remove the Existing water pipes, tee off in the wall "NOT" under the cabinets, you want one solid water line from in the wall up under
where the kitchen sink will be ! The less joints then less likely to have a leak where you can't get at it !

Thanks for that feedback. We are rethinking our design now and may have to forgo the extra cabinet to keep the tees in the wall.