How to Lay Pipe to a Septic Tank
A septic system is very basic in design and when installed properly is almost maintenance free. Though it has only two major components, the septic tanks and the field lines, you must also pay attention to the pipe that runs from your house to the tank. Does this Spark an idea?
Instructions
-
-
1
Determine the best route for your pipe. Most codes require the septic tank to be located a minimum of 10 feet from the house foundation. You must locate the inlet side of the septic tank as well as the drain connection coming from your home. In most cases the shortest distance between these two points is the best route to lay your pipe. Remember, the shortest distance between two points is a straight line, and that is exactly what you want. If possible have no curves or angles in your drain line that might interfere with the smooth flow of the waste water.
-
2
Dig the trench/ditch along the route you have selected. The depth at the septic tank should be 1 to 2 inches below the inlet opening. The ditch should extend under the home to the location where you want your drain pipe to be buried. The ditch should be approximately 6 inches wide and does not need to be more than 12 inches in depth. Clear out all large roots and any rocks or debris in the ditch. Over time rocks can wear into the pipe and cause a leak, so keep the ditch as clean as possible.
-
-
3
Lay the pipe in the ditch using 4-inch schedule 40 PVC pipe. This is a very sturdy pipe and should provide years of trouble-free service. Secure one end in the septic tank, sealing it to be watertight. Use pipe joints to extend the pipe the required length under the home. Make certain the pipe angles down toward the septic tank. Use a 90-degree elbow at the end to turn the pipe upward. Then make the final connection between the elbow and the house drain. Be certain to use PVC pipe cleaner first, then the proper PVC pipe cement compound to firmly join all couplings and joints.
-
4
Check your local codes to determine if an exterior pop-up valve is allowed. It so, add a T-joint in the pipe just outside of the foundation. Cut a short piece of pipe so that it will barely reach the top of the ditch. On top of this install the pop-up valve. Should the septic tank ever back up, the pop-up valve will float out and allow the water to drain into your yard rather than back up into your home. While this still presents a nasty problem, it is by far the lesser of the two evils.
-
1
Tips & Warnings
Before applying any PVC cement, push all the pipe pieces together to be certain everything is the proper length and does what you need it to do. Then take them apart and apply the cement for a permanent set.
When using the PVC cleaner and cement always do so in a well-ventilated area and wear appropriate protective gear. This should include gloves and eye protection.
