How to Lay a Drainage Pipe
- 1). Dig a trench to the correct length and depth to reach the existing sewer pipe that runs either to the city sewer or a private septic tank. Make sure the trench's depth complies with your local building code. The gradient of the installed sewer pipe must also comply with the code (all horizontally laid sewer pipe is installed at a gradient to allow for gravity to move waste along the pipe). Dig the bottom of the trench to comply with this required gradient.
- 2). Clean the end of the existing sewer pipe that runs to the city sewer/septic tank with a damp rag. Measure and cut to length the first section of PVC sewer pipe. Make a straight perpendicular cut through the pipe using a handsaw, circular saw or miter saw. Remove all burrs from the cut with a utility knife.
- 3). Brush PVC primer around the outside end of the existing sewer pipe, as well as one end of the new section of pipe. Then prime the inside of a PVC coupling. Brush PVC cement onto all primed areas. Push the coupling onto the end of the existing sewer pipe, and the new pipe section into the other end of the coupling. Hold the pipes to the coupling for five seconds while the cement dries.
- 4). Cut the next section of PVC sewer pipe to length and remove burrs. Apply primer to one end, as well as the remaining end of the first new section of pipe. Prime the inside of a second coupling. Apply PVC cement to all primed areas. Push the coupling onto the end of the first section of pipe, and the second section into the other end of the coupling. Hold in place for five seconds. Continue installing new pipe sections in like fashion, until the new pipeline reaches past the end of the trench.
- 5). Pour fine gravel around the new pipeline on all sides. Then fill in the trench.
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