The pipe wall is still structurally sound
Corroded and rough on the inside, but not thinned to the point of cracking or collapse.
Cast Iron Pipe Epoxy Coating
Is My Cast Iron Pipe a Candidate for Epoxy Coating?
A quick, honest breakdown of which cast iron pipes can be coated and which ones need a different fix.
- Free camera inspection with any drain line cleaning
- Free estimate on every job
- Licensed in GA & SC
MaxLiner Certified InstallerCertified on the MaxLiner CIPP system used for our trenchless pipe lining.120+ Trenchless JobsTrenchless repairs completed across the CSRA, residential and commercial.6-Person Field CrewEnough field capacity to keep scheduling tight across all six cities.
The Process
Aging Cast Iron and Where Epoxy Coating Fits
Cast iron drain and supply lines were standard in homes built before the 1970s, and after 50-plus years underground or inside walls, that pipe is usually corroding from the inside out. Epoxy pipe coating is one of the least invasive ways to deal with that corrosion — but it is not a fix for every pipe. This page walks through the specific conditions that make a cast iron pipe a good candidate for coating, the conditions that rule it out, and what the process and pricing actually look like.
The Detail
What Epoxy Pipe Coating Actually Does
Epoxy pipe coating is a two-part epoxy that is blown or pulled through a cleaned, descaled pipe to form a smooth interior protective coating. That coating seals pinhole leaks and halts further corrosion, restoring interior flow without opening walls, floors, or yards. It is a surface treatment, not a structural repair — it protects the pipe wall that is already there rather than rebuilding one that has failed. That distinction is the whole basis for whether your pipe is a candidate.
In Practice
Signs Your Cast Iron Pipe Might Be a Good Candidate
You're dealing with pinhole leaks, rust buildup, or reduced water flow rather than a collapsed or offset section of pipe.
A camera inspection shows corrosion and scale, but no visible holes large enough to compromise structural integrity.
The pipe run is a straight or gently sloped section that the coating equipment can reach and coat evenly.
You want to avoid cutting into walls, floors, or slab to access the line.
Worth Knowing
Signs Your Pipe Is Not a Candidate for Coating
Not every corroded cast iron pipe can be coated. If the pipe wall is too thin or already perforated in multiple places, epoxy has nothing solid to bond to and won't hold under water pressure over time. If a section has collapsed, is badly offset at a joint, or has significant root intrusion from a cracked joint, the problem is structural — coating a compromised pipe wall in that condition just delays a repair that needs to happen anyway. In those cases, CIPP pipe lining (which structurally reinforces the pipe from the inside) or a traditional excavation repair are the more appropriate paths, not epoxy coating.
The Specifics
Descaling: The Required Step Before Coating
Epoxy will not bond properly to a pipe interior that's still coated in scale, rust, and mineral buildup. That's why pipe descaling is a mandatory prep step, not an optional add-on, before any epoxy coating job. The process starts with a camera inspection to assess how much scale is present, followed by mechanical descaling tools — chain knockers and scraping heads sized to the pipe — that remove the buildup. A hydro jet flush clears the loosened material, and a post-descale camera pass confirms the pipe interior is clean enough for the epoxy to adhere. If that final camera pass reveals a pipe wall that's too thin or already perforated, that's the point where a coating job gets redirected to CIPP lining or excavation instead.
Closer Look
How the Full Process Works
- 01Camera inspectionWe run a camera through the line to assess corrosion severity, scale buildup, and overall pipe condition before recommending anything.
- 02Isolate and dry the lineThe section is isolated, drained, and dried with heated air to prepare it for descaling.
- 03Descale and cleanMechanical descaling tools remove interior scale and corrosion, followed by a pressurized grit clean and hydro jet flush.
- 04Apply the epoxy coatingThe two-part epoxy is blown or pulled through the cleaned pipe to form a smooth, sealed interior coating.
- 05Cure and verifyThe coating cures, then a final camera pass confirms full, even coverage before the job is closed out.
Context
What It Costs
Pricing depends on pipe diameter and length, and access complexity (such as needing to cut sheetrock or break concrete to reach the pipe) can affect the total. Every job starts with a free estimate, and a firm quote is provided before any work begins.
Epoxy pipe coating carries a 10-year workmanship warranty. The long-term service life of the epoxy pipe coating product itself depends on pipe condition and use, so we don't publish a blanket figure — your estimator can give you the manufacturer-rated number for your pipe.
| Service | Price |
|---|---|
| Epoxy Pipe Coating (4-6 inch pipe) | $125-$175 per linear ft |
| Pipe Descaling (once accessible) | Starting at $10 per linear ft, plus access complexity |
| Sewer Camera Inspection (standalone) | Starting at $250 — FREE when bundled with any drain line cleaning |
| CIPP Pipe Lining, 4-inch pipe (if coating isn't viable) | $75-$200 per linear ft |
| CIPP Pipe Lining, 6-inch pipe (if coating isn't viable) | $100-$300 per linear ft |
Epoxy Pipe Coating (4-6 inch pipe)
- Price
- $125-$175 per linear ft
Pipe Descaling (once accessible)
- Price
- Starting at $10 per linear ft, plus access complexity
Sewer Camera Inspection (standalone)
- Price
- Starting at $250 — FREE when bundled with any drain line cleaning
CIPP Pipe Lining, 4-inch pipe (if coating isn't viable)
- Price
- $75-$200 per linear ft
CIPP Pipe Lining, 6-inch pipe (if coating isn't viable)
- Price
- $100-$300 per linear ft
Side by Side
Epoxy Coating vs. CIPP Lining: Which One Do You Need?
These two trenchless methods solve different problems and aren't interchangeable. Epoxy coating seals and protects a pipe wall that's still structurally sound — it's a corrosion barrier. CIPP (cured-in-place pipe) lining structurally replaces the function of the pipe by installing a new pipe-within-a-pipe, and carries a 10-year workmanship warranty because it's addressing structural failure, not just surface corrosion. If a camera inspection shows your pipe still has solid wall thickness, coating is usually the lower-cost, less invasive option. If the pipe is structurally compromised, lining is the appropriate fix — and using coating on a pipe that actually needs lining just means paying for a repair that won't last.
Background
The Only Way to Know for Sure
Everything above is a general guide — the only way to know definitively whether your specific cast iron pipe is a coating candidate is a camera inspection. That inspection shows exactly where the corrosion is, how thin the pipe wall has gotten, and whether there are any structural failures that rule coating out. TDS Trenchless has been doing trenchless-specific pipe work in the Augusta area since 2011, and every estimate — including the camera inspection — is free, with a firm quote provided before any work begins.
Go Deeper
Not Sure Which Category Your Pipe Falls Into?
Start with a camera inspection — free with any drain line cleaning — so the quote you get is based on what is actually in your pipe.
Questions
Frequently Asked Questions
How do I know if my cast iron pipe can be epoxy coated instead of replaced?
The definitive answer comes from a camera inspection. In general, a pipe is a good candidate if the wall is still structurally sound — corroded and rough inside, but not perforated or thinned to the point of failure. If the camera shows a collapsed section, major offsets, or holes, coating won't hold and CIPP lining or excavation is the better route.
Do I need pipe descaling before epoxy coating?
Yes. Descaling is a required prep step, not optional. Epoxy needs a clean interior surface to bond to, so the pipe is camera-inspected, mechanically descaled, and hydro jet flushed before the coating is applied. That descaling pass also doubles as a final check on the pipe's condition before coating begins.
What's the difference between epoxy pipe coating and CIPP pipe lining?
Epoxy coating seals and protects a pipe wall that's still structurally intact — it's a corrosion barrier applied to the interior surface. CIPP lining structurally replaces the pipe's function by installing a new liner inside the old one, and is used when the pipe wall itself has failed. They solve different problems: coating for corrosion, lining for structural failure.
How much does epoxy pipe coating cost?
Epoxy pipe coating runs $125-$175 per linear foot for 4-6 inch pipe. Every job starts with a free estimate, and a firm quote is provided before work begins — actual cost depends on pipe length, diameter, and how accessible the pipe is.
What if my pipe turns out not to be a good candidate for coating?
If a camera inspection or the descaling process reveals a pipe wall that's too thin, already perforated, or structurally compromised, we'll recommend CIPP pipe lining or a traditional excavation repair instead. We won't coat a pipe that actually needs structural lining — it wouldn't hold up, and it isn't a repair worth paying for twice.
Ready When You Are
The only way to know for certain whether your cast iron pipe qualifies for epoxy coating is to look inside it. TDS Trenchless offers a free estimate on every job, and a quote is provided before any work begins. Call (706) 535-5757 or request a free estimate online to get a camera inspection scheduled.
Every job starts with a free estimate. Licensed in Georgia and South Carolina.
- Free estimate on every job
- Licensed in GA & SC
- 10-year workmanship warranty on CIPP