Kentucky Journeyman Plumbing Practice Test

Pipes for a house sewer must be proven underground drainage materials that resist soil conditions, waste, and potential movement. Clay tile and cast iron have long been used for waste lines because they’re strong and durable in the ground. Modern plastic DWV piping, like PVC or ABS, is also standard when rated correctly; the SDR (standard dimension ratio) numbers show the wall thickness and strength of the plastic pipe. So a mix of clay, extra-heavy cast iron, and plastic pipes with appropriate SDR ratings (for example SDR 35 or SDR 40) represents accepted options for a house sewer. Copper is not typically used for sewer lines, since it’s expensive and not as suitable for waste and soil conditions. Materials like glass, rubber, aluminum, nylon, brass, and general steel aren’t standard choices for residential sewer piping, and while concrete piping exists in larger municipal sewers, it isn’t the typical interior house sewer material. The combination that includes clay, EH cast iron, and plastics with proper SDR ratings best matches the materials commonly approved for house sewers.