Coating manholes is a critical step in protecting underground infrastructure from chemical attack, I&I, and structural degradation. By forming a durable barrier, coatings enhance service life, simplify maintenance, and improve safety and compliance.

 

 

1. Corrosion Protection

• High-performance coatings resist hydrogen sulfide, sewage acids, and chlorides that corrode concrete and steel.

• Prevents pitting, spalling, and reinforcement corrosion that lead to costly repairs or collapse.

 

2. Structural Integrity & Crack Bridging

• Flexible, high-build membranes bridge hairline cracks and minor substrate movement.

• Maintains a monolithic barrier over shifting soils and thermal cycles, preventing progressive deterioration.

 

3. Infiltration/Inflow Control

• Seamless coatings seal porous concrete and faulty joints, blocking groundwater infiltration.

• Reduces inflow of stormwater and soil moisture, protecting downstream treatment capacity and reducing energy costs.

 

4. Odor and Gas Tightness

• Specialized gas-resistant systems contain methane, hydrogen sulfide, and nuisance odors.

• Tight seals at benching, walls, and covers safeguard worker health and nearby communities.

 

5. Hydraulic Efficiency & Surface Smoothness

• Smooth coated surfaces minimize sediment buildup and flow resistance.

• Enhances sewer hydraulic capacity and reduces solids deposition, extending cleaning intervals.

 

6. Maintenance & Inspection Efficiency

• High-contrast finishes make inspections faster and easier.

• Nonporous surfaces simplify cleaning and reduce labor for manual or robotic condition assessments.

 

7. Safety & Regulatory Compliance

• Slip-resistant aggregates on benches and steps improve entry/exit safety in wet conditions.

• Low-VOC, food-grade, or NSF-approved coatings help meet environmental and potable-water standards.

 

8. Lifecycle Cost Savings & Asset Management

• Upfront coating investment delays full-depth rehabilitation or replacement by decades.

• Predictable recoat cycles streamline budgeting and maximize return on capital assets.