If left untreated, root intrusion can eventually lead to a complete collapse of the sewer system.Īt that point, the last resort would be to dig up the sewer line, which could cost the home or building owner thousands of dollars. While proper backfilling is a reliable way to aid in preventing root intrusion, deterioration of concrete or rotted-out cast iron is inevitable over time, allowing roots to grow through the openings. In instances where the manufacturer's instructions for materials are more restrictive than those prescribed by the code, the material shall be installed in accordance with the more restrictive requirement." Backfill shall be brought up evenly on both sides of the pipe so that the pipe remains aligned. The backfill under and beside the pipe shall be compacted for pipe support. Loose earth free from rocks, broken concrete and frozen chunks shall be placed in the trench in 6-inch (152 mm) layers and tamped in place until the crown of the pipe is covered by 12 inches (305 mm) of tamped earth. The International Plumbing Code states: "Backfill shall be free from discarded construction material and debris. Sagging can cause stress, leading to breaks, allowing roots to enter. The area around the pipe is compacted to help prevent the pipe from sagging or forming bellies in the line. Professionals can help prevent root intrusion during installation by ensuring proper backfilling. Roots can also grow through partially collapsed pipe or even rotted-out cast iron. With time, the concrete deteriorates, and roots grow through the openings and expand, damaging the piping. In old clay sewer lines, drain sections were connected by inserting the non-bell (spigot) end of the pipe into the hub of the next section and filling the gap with concrete. While that's great for plants and trees, it can have a devastating impact on a sewer system. Roots thrive in sewer lines because they are well-ventilated and provide an excellent water source. Root intrusion is one of the most significant problems to discover in a sewer system. Get Cleaning articles, news and videos right in your inbox! Sign up now.
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