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sanitary sewer rehabilitation

Failing brick or cast-in-place concrete structures need a full circumference lining.

culvert rehabilitation

Corrugated metal pipe at the end of it’s life span can be rehabilitated for another 50+ years

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storm sewer rehabilitation

CMP, brick, steel, stone, concrete or clay tile storm sewers can be restored with reinforced gunite lining.

manhole rehabilitation

Deteriorated concrete and brick manholes can be restored with our specialized spray equipment using Strong-Seal products.

your turn-key pipe solution

National Gunite restores the structural integrity of leaking and collapsing pipes with trenchless construction across the United States. Conventional excavation is avoided, and lines are rehabilitated at a fraction of the cost of a new installation.


Indianapolis, IN


Johnstown, PA

Call for more info or Emergency Services


common problems we tackle

Positioned across America’s Rust Belt, there are few of our country’s aging and deteriorating infrastructure problems that our experienced team hasn’t tackled and solved.

our proven process

Concrete, brick, and metal pipelines deteriorate over time, causing leaks, sinkholes, and cave-ins. National Gunite provides trenchless repair of sewers and storm culverts using concrete that is pneumatically sprayed onto steel reinforcement. We can repair these lines from inside the pipe by lining the pipe with steel reinforcement and spraying the surface with multiple inches of shotcrete. The finished repair fully restores the structural integrity of the pipe for decades of future use.


control & Bypass Water Flow

National Gunite will dewater the work area within the confines of the pipe by constructing a temporary sandbag weir and directing the flow through an internal flume system. On rare occasions, external bypass pumping may be necessary.

Clean Debris & Prepare the Pipe

Our crew cleans and prepares the interior of the pipe. Light and heavy debris is removed either by hand or mechanically. If necessary, deteriorated/rusted sections of pipe may be removed by using cutting blade grinders and/or pneumatically powered saws.

Install Steel Reinforcement

Reinforcement could range from fibers (added while mixing shotcrete materials) to rebar. Typical reinforcement consists of galvanized steel wire mesh, but depends on the pipe design parameters of our program.

Shotcrete Application

National Gunite applies micro-silica enhanced dry-mix shotcrete (aka Gunite) typically from the 3 to 9 o’clock position on the pipe. Micro-silica increases strength and enhances resistance to abrasion, as well as corrosion.

Restore Water Flow

Typically 12-16 hours after the final application of shotcrete, the temporary sandbag weir is removed and the water is restored through the structurally rehabilitated pipe.

Industry Testimonials

National Gunite’s key to success are the trusted relationships we have built with our customers. Service doesn’t end when the project is completed. 

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