Culvert Repair

A completely deteriorated invert in a CMP culvert

A completely deteriorated invert in a CMP culvert

Installing reinforcing steel in a deformed CMP culvert prior to gunite application

Installing reinforcing steel in a deformed CMP culvert prior to gunite application

A failed joint in a CMP culvert

A failed joint in a CMP culvert

A completed CMP culvert restoration

A completed CMP culvert restoration

  • Culverts are pipes that carry storm water and are generally made from galvanized corrugated steel, concrete, or stone. National Gunite can rehabilitate all three types of culverts.
  • Corrugated Metal Pipe (CMP) was the industry standard for large culverts during the 1950’s through the 1970’s.
    According to the U.S. Corps of Engineers, corrugated metal pipe has a design life of up to 50 years, so most of it has outlived its expected life.
  • In most cases, National Gunite can restore nearly any culvert at a fraction of the cost to replace it.
  • If a CMP it is completely deteriorated and in danger of imminent failure, we can perform a full-diameter repair. This essentially renews the life expectancy of the culvert for another 50 years.
  • In many cases, only the invert (bottom) of the pipe needs to be repaired because the water and sediment in the flow line have worn off the galvanized coating. Even when the bottom of the pipe is completely missing, we can complete a robust structural repair that will last for decades.
  • An invert or joint repair using gunite is especially cost effective when comparing it to cured-in-place resin liners. All resin liners must cover the entire interior surface of the pipe, even in areas when the corrugated steel may be in pristine condition.
  • National Gunite has rehabilitated corrugated metal storm sewer pipes as large as 30 feet in diameter.