Collapsed or failed lines
This is a big problem in homes that were built in the 1950s or earlier. Many of these homes used “Orangeburg Pipe”, a type of pipe that is made from layers of wood pulp and tar, pressed together tightly.Over time, these pipes disintegrate and collapse. If the sewer line is built out of Orangeburg pipe, it must be replaced. And the only way to know if this is the case is to check with a sewer scope. Orangeburg pipes aren’t the only concern, though. Even pipes made of PVC, metal, or other materials can fail, as the ground shifts and compresses the piping.