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 Relocating kitchen plumbing
Author: jaspenn (FL)

Hello everyone,
We have a 70s ranch home on slab.
We want to remodel the kitchen and possibly relocate the sink and related plumbing from an interior wall (garage on the back side) to an exterior wall with a window. The move would be about 15' in a straight line. How should I handle the sink/dishwasher drain line? Is it ok to simply run a drain line through the slab from the new location to the old drain? Or, do we need to do something different? Can the water lines simply be extended to the new location? Thank you in advance.

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 Re: Relocating kitchen plumbing
Author: North Carolina Plumber (NC)

As long as you keep 1/4" per foot slope on the drain pipe ,just cut the old pipe off, add a coupling and run to the new location.
The water lines will need to be protected either by a sleeve or pipe insulation from the point you tie onto them until they exit the slab.

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 Re: Relocating kitchen plumbing
Author: hj (AZ)

The water lines CAN be extended to the new location, BUT, if the connection to extend them will be under the floor, which is what you indicate, there are very specific limitations on HOW you can do it.

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 Re: Relocating kitchen plumbing
Author: jaspenn (FL)

Am I correct in assuming that 1/4" rule would start at the point where the new drain pipe begins in the slab at the new sink location and run to the point where the drain pipe connects to the old drain in the slab? So, if it's a 16' run, that would be a 4" slope. Does that indicate the connection to the old drain pipe will have to be below the top of the slab? Thank you for sharing your expertise.

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 Re: Relocating kitchen plumbing
Author: jaspenn (FL)

Thank you, I will keep that in mind.

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 Re: Relocating kitchen plumbing
Author: packy (MA)

you are correct in your assumption.

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 Re: Relocating kitchen plumbing
Author: hj (AZ)

It HAS to be below the slab, but we do not know how deep the point where you will connect is.

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 Re: Relocating kitchen plumbing
Author: sum (FL)

You have to look at the total picture, not just the drain but also the vent for the sink fixture. A run of 16' to the old drain plus whatever distance that old drain is from where it connects to the line is a long run so you need to vent that fixture so your exterior wall needs to be opened up (or build out) for the vent, and your slab need to be cut open from new sink location to the old drain, assuming you have over 4" of vertical space at the old drain. All of a sudden its not a small job anymore.

I would recommend looking at old plans, make a trip to your roof to look at where vents are penetrating, and in the attic where vents are tied in, to get some idea whether there may be a better way to connect.

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