Why Wash Park roots come back
Cutting roots does not kill the tree and does not seal the joint they came through. The tree keeps growing toward the same water source, and within twelve to eighteen months the hair roots are back in the same seam.
Cut on a calendar, not on an emergency
Homeowners who schedule an annual cut almost never see a backup. Homeowners who wait for symptoms see one every couple of years, usually at the worst possible time.
When a liner starts to make sense
If the joints are widely separated and the cutting interval keeps shortening, a cured-in-place liner seals the pipe from the inside and ends the cycle without trenching the parkway.
