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Sewer line depth bellow concrete

Sewer line depth bellow concrete

Sewer line depth bellow concrete

(OP)
Hi,
We are doing remodeling of a building.  I have the plumbing floor plan of existing.  How can I find out how far the pipe is bellow the finished floor at any given point. At the floor drains it should be at the depth of the p-trap?

Regards,

Fred

RE: Sewer line depth bellow concrete

Drill hole in concrete floor and probe to find top of drain pipe.

RE: Sewer line depth bellow concrete

most codes require 1/4" per foot minimum slope on drain lines (approximately 2%) which will give you a rough idea where it might be.  Also, check the elevation at the nearest cleanout and then calculate the slope back to the p trap.

RE: Sewer line depth bellow concrete

Flush a tracer wire down the sewer, then use an above ground locater to trace that wire.  Most locaters will give you a depth of what it's tracing, accurate to ~6".

How precise of a depth do you need?

RE: Sewer line depth bellow concrete

(OP)
TO: cr1973,

thanks for your reply.  The accuracy of +/- 6 in. is good.
I want to lay a new drain pipe and tie into an existing.  I am just afraid that at the point of intersection, the new line might end-up to be lower than the existing line.  How do do I plan so they intersect and continue to drain.

regards,

RE: Sewer line depth bellow concrete

Drill at the intersection point of the existing pipe and probe to the top of pipe for an elevation.

RE: Sewer line depth bellow concrete

You'll have to start at the existing pipe and begin laying your new pipe from there.

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