Epoxy pipe lining coats the inside of a pipe
Epoxy lining is a method for restoring pipes without replacing them. The pipe is cleaned, then coated on the inside with a layer of epoxy that seals pinholes and slows further corrosion. It is used most often on supply lines with pinhole leaks, and sometimes on drains. It is not right for every pipe or every home.
This guide explains what drives the price, what the process involves and when repiping is the better path. If a pipe is leaking right now, shut off the main and call, and see burst pipe repair.
What drives the cost of epoxy lining
| Factor | Why it matters |
|---|---|
| Length of pipe. | More pipe means more time and material. |
| Pipe material and condition. | Lining suits sound pipe with surface corrosion, not failing pipe. |
| Access points. | The more places the pipe must be opened, the more labor. |
| Number of fixtures. | Each branch has to be cleaned and coated. |
| Permits and inspections. | Local requirements may add steps. |
A clear price should come after the plumber inspects the pipes, not before.
How an epoxy lining job runs
The method has several stages, and skipping any one lowers the result.
- 1
Inspect the pipe.
The plumber checks the material, tests pressure and decides whether lining is realistic.
- 2
Drain and clean.
The water is shut off and the lines are cleaned with air and abrasive to remove scale.
- 3
Coat the interior.
Epoxy is pushed through the lines to form a thin, continuous coating.
- 4
Cure and test.
The coating cures, the lines are reconnected and pressure tested before water is turned back on.
The home is without water during the process. Plan for that.
Epoxy lining or repiping
Neither is automatically better.
Lining is worth discussing when
- Pipes are corroded inside but structurally sound.
- Walls are finished and opening them would be costly.
- The pipe material is accessible enough to coat.
- You want a shorter disruption.
Repiping is worth discussing when
- Pipes are failing structurally.
- A known failure-prone pipe like polybutylene is present.
- You are already opening walls for a remodel.
- Water pressure is low from heavy interior buildup.
Pinhole leaks in more than one place?
Call and describe the history. A plumber can tell you what fits.
What to ask before approving lining
Epoxy lining of drinking water pipes has had a mixed history, and standards for products used in potable lines matter. Ask what product is used and whether it is approved for drinking water. Ask what warranty applies in writing and who stands behind it.
Ask for the plan if a section fails later. A contractor who proposes lining without inspecting the pipes first, or who cannot explain the material, is a warning sign. You can verify any plumber's license through the state's online lookup before agreeing to anything.
The questions a sales pitch may skip
A lining pitch often starts with a promise of no walls torn open. Ask how many access points will be needed, since every bend, valve and fixture connection needs one. Ask how the contractor will reconnect the lines to each fixture and test each one. Ask what happens if a section does not coat properly and how that is found.
Ask about the water being off. Lining takes days, not hours, and the home has no running water in that time. Plan for showers elsewhere and for dishwasher and laundry downtime. Ask how the pipes are dried and cured and when you can safely use the water again.
Also ask for the project in writing with the scope, the product name and the warranty terms. A reputable contractor is comfortable with that. If the answers are vague or the price depends on signing the same day, take a step back and get a second opinion before spending money.
How to weigh the decision
Put the options side by side in writing. List the cost of lining, the cost of repiping, the number of days without water and the warranty on each. Then ask how each option handles the weakest part of your pipes, since a coating is only as good as the pipe it sits in.
If your pipes are a known failure-prone type, a replacement is often the safer choice. If they are sound with surface corrosion and the walls are costly to open, lining may be reasonable. Either way, an independent second opinion costs little compared with the project.
Roy, UT local note: older homes and license checks
Many Roy homes date from the 1950s through the 1980s, and Utah History Encyclopedia figures show the city grew from about 800 people in the early 1940s to about 24,600 by 1990. That is the age range where galvanized and early copper supply lines begin to wear, so pinhole leaks and lining questions come up often.
The state of Utah offers an online license verification page through the Division of Professional Licensing, which you can use to check any plumbing contractor. For Roy-specific permit rules on pipe work, ask Roy City, since requirements can change. Our Riverdale and West Haven pages cover nearby homes.
Questions people ask
It depends on the product. Ask whether the coating is certified for potable water and ask for documentation. If the contractor cannot answer, choose another one.
Claims vary and depend on pipe condition and installation. Ask for the written warranty and for how long the coating is expected to last in your pipe type.
Lining suits pipes with small pinholes and surface corrosion. A pipe that has split or failed structurally needs repair or replacement.
It can restore pressure in pipes that were narrowed by scale, because the cleaning step removes buildup. A thin coat does not significantly reduce diameter.