Frequently asked questions about pipe lining

Cured-in-place pipe. A resin-saturated tube is installed inside an existing pipe and hardened there, forming a new jointless pipe against the old wall, see CIPP pipe lining.

Liner systems are commonly specified against a fifty-year design life, and installations from the 1970s remain in service. How long a particular liner lasts depends on the design case, the installation quality and what flows through it. [Design life claims to be sourced from product documentation before publication.]

The bore becomes smaller and much smoother. In gravity sewers those effects tend to offset one another, and capacity is often maintained or improved. On a line already at its hydraulic limit, calculate it rather than assume it.

It can be lined, and the sag remains. If the sag is what causes the backups, lining is treating the wrong defect, see lining or replacement.

No. A liner needs a host pipe to press against, and a collapse has lost the shape that provides. Pipe bursting may still avoid a full trench, see trenchless methods.

Styrene-based resin systems have a strong odor, most noticeable during and shortly after the cure, and it can enter a building through a dry trap. Ventilation, trap checks and advance notice are the usual controls, and styrene-free systems exist. [Health and regulatory statements about styrene to be sourced from EPA, OSHA and state guidance before publication. Health concerns should go to a medical or public-health professional.]

Generally by a robotic cutter working from inside the pipe, using positions recorded before the liner was installed. Every connection should be verified on the post-installation survey.

The installation and cure of one shot is often hours rather than days. What sets the calendar is everything around it, bypass, cleaning, a second survey, reinstatement and testing.

Cure systems are managed to a temperature profile, so ambient conditions are a planning variable rather than a stop. What changes is the method, the timing and sometimes the cost.

Products exist from small building drains up to large interceptors. The practical question is whether a contractor within reach carries equipment and liner in your size, which is one of the things a project description settles quickly.

Gradual bends usually, sharp bends and back-to-back fittings often not without risking wrinkles. It is a question to settle from the survey, before the contract.

Terms vary by contractor and by product, and the exclusions matter more than the headline number of years. Read what voids it, and who determines whether it has been voided.

The contract decides. Remedies range from a localized repair to removing and replacing the liner, which is expensive, which is why the earlier stages deserve the attention they rarely get.

Frequently, and it depends entirely on the jurisdiction, the pipe and whether any excavation is involved. Ask the contractor who is responsible for obtaining it, and confirm the answer with the local authority. [Permitting statements to be verified against local requirements before publication.]

We do. The survey, the cleaning, the liner, the cure and the lateral reinstatement are ours, under one written scope. We publish no prices because depth, access and the lateral count decide them, see about us.