Also known as cured-in-place pipe (CIPP), relining starts with cleaning and root-cutting the host pipe, then a fabric liner soaked in resin is inverted or winched into position. Once inflated against the pipe wall, the resin cures — by ambient temperature, hot water, steam or UV light — into a hard, jointless new pipe.
Because there are no joints, the finished liner is highly resistant to root re-entry. Relining suits cracked, root-damaged and partially broken pipes; fully collapsed sections usually still need excavation.