Which type of pipe is recommended for repairing a sewer line?

Using SDR 35 PVC or clay piping for repairing a sewer line is advisable due to several factors. SDR 35 PVC pipes are specifically designed for underground drainage systems and are widely accepted in municipal and plumbing codes for sewer applications. They offer excellent chemical resistance, which is important in a sewer environment where various harsh substances can be present.

The structural integrity and lightweight nature of SDR 35 PVC also facilitates easier installation and handling compared to heavier materials. Clay piping, on the other hand, has been used historically for sewer lines and provides durability and longevity while being resistant to corrosion. Both materials are designed to withstand the conditions typically found in sewer systems, making them the preferred choice for repairs.

While CPVC is suitable for hot water applications, it is not suitable for repair of sewer lines due to its lower structural integrity under ground conditions. Stainless steel, while durable, is often more costly and not commonly used in underground sewer applications. Galvanized steel can corrode over time, especially when exposed to moisture and the substances found in sewer systems. This makes it less ideal for long-term sewer line repairs.