Leaking Sewer Pipe Under Slab
Posted by Bill Bremer on October 03, 19100 at 21:29:12:
My wife and I are building a new house and the plumbers are doing a test of the PVC sewer pipe. The house is framed and all the rough plumbing work is done.

To do the test, they plugged the outgoing sewer line and bathtub drains with inflatable balloons, installed a 1.5 inch standpipe on a third floor lavatory drain, then filled the pipes with water. The water level in the standpipe is dropping about 2 1/2 inches per day.

Should we be concerned about this rate of water drop? We want to be certain we have a tight system because many of the sewer pipes run under the concrete slab.

My rough estimate is that they are testing about 100 feet of 3 inch PVC and 150 feet of 2 inch PVC in the system. Are there any guidelines as to what rate of water loss is acceptable in a system this size?

Any help would be greatly appreciated.


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