Understanding Concrete Adjustment Rings: A Critical Component in Sewer and Water Infrastructure

Why Adjustment Rings Matter in Sewer and Water Projects

In Illinois sewer and water construction, concrete adjustment rings are an often overlooked yet critical component for maintaining proper utility structure elevation. These rings—typically used to adjust the final grade height of manholes and catch basins—ensure that access points remain flush with roadways or surrounding surfaces after paving or resurfacing.

For sewer contractors working on municipal projects, a properly sized and installed adjustment ring can be the difference between a smooth inspection and a costly rework.

What Are Concrete Adjustment Rings?

Concrete adjustment rings are circular precast concrete components installed at the top of manholes or catch basins. They:

• Provide vertical adjustment between the precast structure and the frame/casting.

• Ensure structural load distribution from traffic to the structure below.

• Maintain grade in streets, sidewalks, or grassy areas after utility work or repaving.

Standard sizes include 2”, 3”, 4”, and 6” thick rings, with diameters to match standard manhole openings (e.g., 24”, 26”, or 27” I.D.). Some municipalities in Illinois have specific height or thickness requirements, making it crucial for contractors to understand the spec on each job.

Best Practices for Using Adjustment Rings

To avoid settlement or uneven roads around manhole structures, it’s important to follow a few key practices:

• Use high-quality precast rings that meet ASTM C478 or municipal specifications.

• Limit stack height: Too many rings can compromise stability—typically no more than 3 rings are recommended.

• Ensure full bed contact: Use non-shrink grout or mastic sealant between rings to prevent rocking or infiltration.

• Cap with flexible riser rings or composite lids if required by local codes or traffic loads.

Proper installation prevents water infiltration, structural shifting, and long-term surface depressions that can turn into road hazards.

Common Challenges and How to Avoid Them

• Rings cracking under load → Use certified precast suppliers and avoid using chipped or weathered product.

• Height misalignment → Double-check specs and use a laser or digital level to measure final grade before placing the casting.

• Improper sealing → Always use approved sealant or grout to keep groundwater out and prevent inflow/infiltration fines.

These steps help contractors stay in compliance with inspection standards and DOT/municipal guidelines.

Why Sourcing from a Trusted Local Supplier Matters

Illinois contractors need a dependable source for concrete adjustment rings that can deliver the right product on time—especially when working on tight municipal timelines or during peak paving seasons. At A&A Equipment and Supply, we stock a wide range of concrete adjustment rings, castings, and repair materials, making it easy for crews to complete jobs efficiently and to spec.

Call to Action

Whether you’re working on water main construction, sewer system rehabilitation, or catch basin installations, concrete adjustment rings are essential for grade-level accuracy and long-term durability.

Get in touch with A&A Equipment and Supply for your next sewer or water project.

Visit https://aa.equipment or call us to check inventory and availability.