Cured-in-place pipe (CIPP) is a cost effective technique used to rehabilitate defective sanitary pipes and storm pipes without digging. The pipes in the ground are getting older and everyday more need to be replaced or repaired. CIPP is a way to repair defective pipes without disturbing the pavement, sidewalk, landscaping, or other utilities placed over them.
The process is done by cutting a flexible (commonly polyester felt) tube to fit the host pipe and saturating it with resin. High pressure water or air is then used to push the tube into the host pipe and hold it tightly against its walls. Hot steam is used to cure the resin, thus forming a strong and permanent lining that acts as a pipe within a pipe.