We have 2 trees growing in the same area of our house front yard as the sewer line. As shown in the picture below, one tree is about 5ft away from the line, and the other, about 20ft away. I assume that the water supply line runs next to the sewer line as well. We're concerned about the tree roots getting into the water/sewer lines in the future. What's the most cost-effective preventive measure (aside from cutting the trees down) that will work? My research has led me to root barriers, but wondering if installing them on either sides of the lines is the best way in this case. If so, are there barriers made specifically for water/sewer lines?
The best way to prevent root problems is to replace old leaking cast or concrete pipe with plastic. Once glued there is no need to worry about plastic even when roots grow and buckle plastic (decades long process) plastic moves doesn’t usually break like concrete or cast that has many brittle joints that leak and draw the roots. If you have replaced a section and want to protect a fernco connector or “no hub” I have been told to pack the area with rock salt as the roots won’t like the high salt content, but the salt will dissolve and eventually leave a low point. Supply lines are better sealed than old drain lines and over the years as a tree gets large enough it may affect the lines so the only fool proof method is to not put your tree close.