Skip to Content
  • Construction Products
    • InsulStar Light
    • InsulStar
    • InsulStar 1.7
    • InsulBloc
    • AgriThane
    • EnduraTech
  • Geotechnical Products
    • Dual Component Systems
    • Light Weight Fill Systems
    • Single Component Hydrophobic Systems
  • OEM Products
    • NatureThane
    • ThermaThane
    • CryoThane
    • DecoThane
    • ComforThane
    • IntegraThane
    • InsulThane
  • Construction Applications

    Construction Applications

    Explore the various applications of spray foam and see how it can transform your building today.

  • Geotechnical Applications

    Geotechnical Applications

    Our polyurethane systems are tailored to meet the specific needs of a wide range of applications, from residential to industrial and beyond.

  • OEM Applications

    OEM Applications

    Our partners represent a diverse range of markets and industries, and we provide them with the tools they need to build the best version of their products.

  • All Resources

    All Resources

    Whether you're an applicator, architect, distributor, engineer, or homeowner, NCFI provides the tools, documents, and support you need.

  • Equipment

    Equipment

    See our offerings of Graco and PMC equipment and machinery, our award winning custom rig, and more.

  • Classes

    Classes

    Sign up for our courses for geotechnical and spray foam insulation contractors and applicators.

  • Contractors

    Contractors

    Visit our contractors hub to find a certified applicator for your next project or to become a NCFI contractor.

    • About Us
    • Our Team
    • Our History
    • Careers
    • Case Studies
    • News & Blog
  • About NCFI

    About NCFI

    Learn more about our mission, vision, and our commitment to you.

Partner with Us
Contact Us

Address

P.O. Box 1528
 1515 Carter Street
 Mount Airy, NC 27030

Phone

  • (800) 346-8229

Fax

  • (800) 346-8229

Applications

  • Construction Applications
  • OEM Manufacturing Applications
  • Geotechnical Applications

Products

  • Construction Products
  • OEM Manufacturing Products
  • Geotechnical Products

Why NCFI

  • About Us
  • Our Team
  • Careers
  • History
  • Case Studies

Resources

  • News & Blog
  • All Resources
  • Equipment
  • Classes
  • Contractors & Applicators

Let’t Talk Foam

  • Get Started with NCFI
  • Become a Contractor
  • Find a Contractor

© 1998-2025 NCFI Polyurethanes. A Division of Barnhardt Manufacturing Co. All Rights Reserved

  • Privacy Policy

How Does Polyurethane Work in Sewer Infrastructure Repair?

When it comes to the construction and transportation industries, polyurethane is one of the most versatile and flexible materials in the world.

In sewer infrastructure repair, polyurethane has several useful applications. Polyurethane foam can be used to treat inflow and infiltration issues in manholes, pipe joints, laterals, culverts, and outfalls.

Polyurethane’s Role in Infrastructure Repair

When it comes to the construction and transportation industries, polyurethane is one of the most versatile and flexible materials in the world. In its various forms, polyurethane has many applications from coatings, sealants, and adhesives to void filling, structural support, and insulation. As such, polyurethane’s use within the construction industry has steadily grown especially in sewer infrastructure repair projects.

In sewer infrastructure repair, polyurethane has several useful applications. Polyurethane foam can be used to treat inflow and infiltration issues in manholes, pipe joints, laterals, culverts, and outfalls. It can also seal off and prevent water intrusion to utility boxes, wet wells, and pump stations. Hydrophobic polyurethanes perform exceptionally well in wet conditions, making it the perfect choice for these types of repairs.

Using polyurethane for infrastructure repair has many benefits. The material is lightweight, affordable, and fast curing. Despite its light weight, this closed-cell foam has strong structural properties. It’s also minimally invasive and environmentally inert. Polyurethane repair projects require zero-excavation, which results in a small project footprint.

How Does it Work?

Polyurethane foam is created with a two-part solution. Part A is a chemical called MDI, or Methylene Diphenyl Diisocyanate (also known as ISO) while Part B is resin, a combination of polyols, catalysts, blowing agents, and other components. The two-part solution is mixed using an impingement gun and injected into voids around the affected asset. Tubes can be used to inject the polyurethane into particularly deep or large voids, or otherwise inaccessible areas.

Once the polyurethane is injected, it begins to expand to fill the void and compact unconsolidated soils around the infrastructure asset. The polyurethane will follow the path of least resistance to fill and compact soils. As it does so, it will press against the asset, creating a tight seal and blocking off any cracks or other openings that could allow for water and soil to infiltrate. Due to its hydrophobic properties, the polyurethane will displace any water that surrounded the asset, ensuring a dry environment and preventing damage from moisture.

Get Started with NCFI

Address

P.O. Box 1528
 1515 Carter Street
 Mount Airy, NC 27030

Phone

  • (800) 346-8229

Fax

  • (800) 346-8229

Read More Blogs & News

Read Charlie Lerman, The Grout Geek, Joins NCFI the Geotechnical Team

Jun 12, 2024

Charlie Lerman, The Grout Geek, Joins NCFI the Geotechnical Team

We are excited to welcome Charlie Lerman, aka “The Grout Geek,” as our new Product Line Manager for Single Component Polyurethanes and Western Territory Manager at NCFI Polyurethanes’ Geotechnical division.

Read More
Read Geotechnical Training Courses

Jul 19, 2023

Geotechnical Training Courses

Our Geotechnical Training Course give contractors hands-on expertise in cutting-edge techniques, equipment maintenance, polyurethane behavior, injection design, various applications, and single and dual component systems.

Read More
Read Announcing the IPA Award Winner – Expert’s Choice goes to NCFI Terrapin!

Feb 27, 2025

Announcing the IPA Award Winner – Expert’s Choice goes to NCFI Terrapin!

NCFI Terrapin wins the Expert’s Choice award at the IPA Awards! This achievement highlights our commitment to innovation and excellence in geotechnical solutions.

Read More

We Have Partnership Down to a Science

We understand the challenges you face, and we’re here to help. Reach out today, and let's work together to find the best solution tailored to your needs with the highest-quality polyurethane foam products available.

Let's Talk Foam