Belly in the Sewer line- do you have a Belly in the Sewer line?
The phrase Belly in the Sewer line also known as, a sag in the sewer line, a dip in the sewer line and a low spot in the sewer line. Most Upland Plumbers say Belly in the Sewer line because that is the most common term among Plumbers in Upland. I personally Like to use dip or low spot. There are a few thing that cause this to happen and we can go over them one by one as to the Belly in the Sewer line. A sewer line should be installed with a slope on it and should be 1/4″ of slope per foot of pipe. If you get what we call when you have negative flow or back grading, Thats when you develop a Belly in the Sewer line.
What causes a Belly in the Sewer line?
A Belly in the Sewer line can be caused by faulty installation or something pushing the sewer line down such as tree roots or sewer lines that run under the ground where traffic rolls over it with heavy vehicles. faulty installation is when the trench is dug for the new sewer and the soil is excavated lower then where the sewer is going to lay and the contractor has to add a little dirt back in to lift the pipe a bit and does not compact the soil below the pipe. This can be detected with a Sewer Camera Inspection. What happens is the contractor will add some soil back in the trench and levels the pipe without compacting it, receipt for a Belly in the Sewer line for sure. He then adds the rest of the soil over the pipe when he back fills the trench and over time the heavy soil pushes the pipe down causing the Belly in the Sewer line.
Tree roots cause a Belly in the Sewer line
Tree roots will cause a Belly in the Sewer line or an offset. The way tree roots cause the Belly in the Sewer line is then the tree roots get so large and start pushing on the pipe it will push it if the soil is weaker then the tree roots. Otherwise the roots will grow around the pipe and not cause a Belly in the Sewer line. The one thing we do see in Upland quite often is Offsets in the pipe and not a Belly in the Sewer line. An offset is when the tree roots grow next to or into one of the pipe joints. If the roots get into one of the joints and favor one side, it will push one pipe up or down and not affect the other. When this happens the sewer is now not lined up and you are sure to have drain problems. The only way to fix an offset or a Belly in the Sewer line is to dig it up and repair it.
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