Knowledge Base

What is CIPP (cured-in-place pipe)?

CIPP is a trenchless method for rehabilitating a damaged pipe by inserting a resin-saturated liner into the existing pipe and curing it in place, usually with heat, UV light, or ambient cure, so it hardens into a new, jointless pipe inside the old one without digging up the ground above it.

In North America, CIPP installation is governed primarily by ASTM F1216 (inversion-installed CIPP) and ASTM F1743 (pulled-in-place CIPP). Those standards set design, installation, and testing requirements. NASSCO publishes companion guidelines, and most municipal specs reference the ASTM standards directly.

Because it does not require open-cut excavation, CIPP is the dominant method for rehabilitating sanitary sewer mains, especially under roads, in tight urban rights-of-way, or where the goal is reducing inflow and infiltration rather than a full pipe replacement. Bid quantities are typically measured by linear foot and diameter, with separate line items for point repairs, lateral reinstatement, and the bypass pumping needed to keep the sewer flowing while the work is underway. CIPP quantities, diameters, and the ASTM standards a spec calls out are usually spread across dozens of drawing sheets and a technical spec section. Nonlinear extracts that scope when it reads a sewer rehabilitation bid package.

Browse all Knowledge Base terms →

Win more of the right work

Give your team the intelligence to find better opportunities, make faster decisions, and build more.