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Manhole Lining For Corrosion Protection And Structural Reinforcement
Manhole lining is a proven, high-strength solution for rehabilitating and protecting aging underground infrastructure. ArmorThane’s manhole lining systems create a corrosion-resistant, leak-proof barrier inside existing manhole structures.
Our spray-applied polyurea and polyurethane protective coatings provide both corrosion protection and structural reinforcement, extending the service life of manholes, lift stations, and other critical sewer assets.
A manhole lining is a continuous coating applied to the interior of a manhole to form a new protective surface. These protective coatings (often advanced polyurea or epoxy coating formulations) bond to the concrete or brick walls of the existing structure, sealing out moisture and corrosive agents.
A manhole liner creates a corrosion-resistant inner shell that shields the host structure from chemical attacks, water infiltration, and physical wear. ArmorThane’s manhole lining systems are spray-applied, meaning they can be installed without digging up the existing manhole – known as the trenchless manhole rehabilitation method.
The coating quickly sets, forming a durable cured-in-place manhole liner that conforms exactly to the manhole’s shape. This process restores aging concrete manholes and similar structures to like-new conditions without the expense and disruption of full replacement.
Underground sewer system structures endure harsh conditions. Concrete manholes and lift station wet wells are constantly exposed to sewage, stormwater, and corrosive sewer gases. Over time such an environment causes chemical attacks on the concrete or metal surfaces.
Applying a manhole lining is an ideal solution for aging sewer and stormwater infrastructure because it addresses multiple problems at once:
Our linings form an inert barrier that is highly resistant to sewage acids, gases, and other types of harsh chemicals.
Polyurea offers exceptional acid resistance, shielding the substrate from sulfuric acid and other corrosives, and this corrosion protection prevents further decay of the underlying concrete or steel.
Unlike bare concrete, a lined manhole withstands decades of exposure to hydrogen sulfide and other chemical attacks without deteriorating.
A seamless (literally, without seams) ArmorThane liner stops leaks in their tracks. It adheres to every inch of the manhole interior, sealing cracks, joints, and pinholes.
By eliminating groundwater infiltration, the liner prevents excess water from entering the sewer collection system during rain events or high water table conditions and mitigates infiltration issues that can lead to overburdened lift stations and treatment facilities.
Our high-build polyurea adds significant structural reinforcement to the manhole. Once cured, the liner has high compressive and tensile strength, effectively creating a new pipe-within-a-pipe.
It bonds monolithically to the existing walls, restoring integrity even if the substrate was partially deteriorated, and this added high-strength layer re-establishes the manhole’s structural integrity, enabling it to handle soil loads and traffic stress like a new structure.
Combining these benefits means manhole lining greatly extends a structure’s service life. A quality liner can add decades of use to a deteriorated manhole, providing a long-term solution that delays or avoids full replacement.
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Surface deterioration, exposed aggregate, and acid-etched walls indicate active MIC (Microbiologically Induced Corrosion)
Water seeping through cracks, pipe joints, and wall seams — a sign of failed waterproofing and structural compromise
Unexplained increases in inflow and infiltration (I&I) overwhelm treatment capacity and increase operating costs
Concrete delamination, rebar exposure, and structural cracks compromise manhole integrity and safety
Proactive manhole lining can extend infrastructure life by 25–30 years and reduce long-term costs by 40–60%.
Polyurea manhole lining systems offer the best combination of durability, speed of installation, and long-term value. ArmorThane's spray-applied polyurea creates a seamless, monolithic barrier that protects against H₂S corrosion, stops infiltration, and adds structural reinforcement — all in a single application that returns manholes to service within hours, not days.
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Compare key performance properties across different manhole lining methods
Learn from ArmorThane's technical experts about selecting the optimal manhole lining solution for your project.
In municipal wastewater systems and collection system networks, most manholes are constructed of concrete or brick. Lining these manholes restores deteriorated surfaces and protects them from future corrosion. Cities across the United States are incorporating linings into their manhole rehabilitation projects to renew aging sewer infrastructure without costly excavation. Our solutions have been implemented from small towns to large metropolitan sewer systems, with consistent success in stopping leaks and corrosion.
Storm drain manholes and catch basins can also be lined to prevent leaks and deterioration. Even though stormwater is less corrosive, linings protect against erosion and groundwater intrusion in these structures.
Sewage lift stations (pump stations) are deep manhole-like structures that house pumps, making them prone to severe corrosion from concentrated sewer gases, with even greater consequences. Lining a lift station wet well provides robust corrosion protection and leak sealing under those extreme conditions. The high-strength liner helps maintain the wet well’s shape and structural integrity, and utilities often line their key lift stations to avoid catastrophic failures and environmental spills.
Primarily used in wastewater systems, the same linings can protect concrete tanks at a wastewater treatment plant or valve vaults in water distribution systems. Many of ArmorThane’s coatings are certified safe for potable water contact, making them versatile beyond sewer applications.
Yes. A spray-on manhole liner forms a continuous, joint-free seal over cracks, seams, and around pipe inlets, effectively sealing a leaking manhole from the inside. This stops groundwater infiltration and exfiltration by creating a watertight envelope. By eliminating infiltration issues, the liner keeps excess water out of the sewer line and prevents sewage leakage into soil. Stopping leaks helps preserve surrounding roadbeds and keeps the wastewater system more efficient.
Yes, a quality manhole lining system significantly enhances a manhole’s strength. ArmorThane’s polyurea liner adds structural reinforcement to the existing walls, thanks to its high bond strength and tensile strength. It can bridge gaps and hold together sections of deteriorated concrete, essentially creating a new structural wall inside the old one. While extremely damaged manholes may need additional repairs, most linings can return an aging structure to good condition with improved structural integrity.
Manhole liners provide a long-term solution, often extending a manhole’s service life by 20-50 years or more. They withstand continuous exposure to sewage and temperature swings without significant degradation. Once lined, the manhole typically needs little maintenance over decades. This extended lifespan makes lining a very cost-effective approach compared to repeated minor manhole repair or full replacement.
The protective coatings industry is growing at an unprecedented rate. Here's why now is the best time to become an ArmorThane applicator.
Join a growing network of certified professionals who are building thriving businesses with the most advanced polyurea and polyurethane coating systems in the world. ArmorThane provides everything you need to succeed.
Estimate your potential revenue as an ArmorThane applicator based on real market data and typical project pricing.
* Estimates based on industry averages. Actual results vary by market, experience, and business management.
Hear from ArmorThane applicators who transformed their careers and built profitable coating businesses.
ArmorThane's training and ongoing support made all the difference. Within six months, we had more work than we could handle. The manhole lining market alone keeps us busy year-round.
I added ArmorThane coatings to my existing contractor business and it completely transformed our revenue. No franchise fees means we keep more profit.
Starting with ArmorThane was the best business decision I ever made. The protected territory gives me peace of mind, and the product quality sells itself.
When you partner with ArmorThane, you're backed by decades of innovation, trust, and proven results.
The protective coatings market is one of the fastest-growing sectors. Here are the areas where ArmorThane applicators are thriving.
ArmorThane's comprehensive training program ensures you have the knowledge and confidence from day one.
ArmorThane designs and manufactures application equipment in-house. From compact units to high-volume systems, we have the right setup for your business.
Flagship plural-component system for truck bed liners, manhole linings, industrial floors, and more.
Complete self-contained mobile workshop with equipment, product, compressor, and generator.
Accessible entry point for new applicators or businesses adding coatings as an additional service.
See how an ArmorThane applicator business compares to franchise models and traditional contracting.
ArmorThane provides exclusive, protected territories to authorized dealers at no additional cost. Your territory size is based on the population you can service.
Here's a typical day for a full-time applicator running a manhole lining and protective coatings business.
The diversity of applications means year-round work and multiple revenue streams.
ArmorThane's coatings extend asset life, reduce waste, and use solvent-free formulations.
Go from interest to revenue-generating applicator in as little as 30 days.
Join the ArmorThane family and gain access to world-class products, professional training, ongoing support, and a proven business model with zero franchise fees or royalties.
Investing in professional manhole lining is an effective solution to prolong the life of your underground assets and avoid emergency failures. It rehabilitates each existing manhole without excavation, drastically reducing downtime and cost.
ArmorThane is a leader in trenchless manhole rehabilitation, providing industry-leading products and expertise to municipalities and contractors on manhole rehabilitation projects.
All our installations are handled by trained, certified installers for quality results. We proudly support our partners with reliable, high-performance protective coating solutions for sewer infrastructure rehabilitation.
So if you are ready to protect and strengthen your manholes and lift stations, we’re here to help. Contact us today to learn more about our manhole lining systems, technical training programs, and partnership opportunities.
Our team will work with you to implement the ideal solution for your needs, helping you to achieve safer, longer-lasting infrastructure and peace of mind for years to come.
I am a chemist with a specialization in nanotechnology and applied materials chemistry. My work has focused on the characterization of optoelectronic materials, namely including semiconductor nanocrystals.
