Manhole repairs with foam-injection

No-Excavation Manhole Repairs with Polyurethane Foam Injection

Maintaining municipal infrastructure is a crucial task that ensures the safety and functionality of cities and towns. One important aspect of infrastructure maintenance is the repair of manholes, which can deteriorate over time due to various factors. Traditionally, manhole repairs often involved extensive excavation, leading to disruption, increased costs, and safety concerns. 

Modern Solution

However, a modern solution that has gained traction in recent years is the use of polyurethane foam injection for no-excavation manhole repairs. This innovative method offers a range of benefits that make it a compelling choice for municipalities looking to address manhole issues effectively.

Understanding the Problem: Deteriorating Manholes

Manholes are essential components of wastewater and sewer systems, providing access points for maintenance and inspections. Over time, these manholes can experience deterioration due to factors like heavy traffic, exposure to harsh chemicals, freeze-thaw cycles, and soil movement. Cracks, leaks, and structural damage can compromise the integrity of manholes, leading to infiltration, exfiltration, and even sinkholes if left unaddressed.

Traditional Excavation Methods: Drawbacks and Limitations

Historically, repairing damaged manholes involved excavating the surrounding area to access the damaged section. While effective, this approach came with several significant drawbacks. The excavation process disrupted traffic flow, inconvenienced residents, and increased the risk of accidents. Moreover, it was time-consuming, labor-intensive, and often costly, as it required heavy machinery and manual labor.

Polyurethane foam injection has emerged as a revolutionary solution for manhole repairs, eliminating the need for extensive excavation. This method involves injecting a specialized polyurethane foam into the damaged areas through small access points. The foam expands, fills voids, stabilizes the soil, and provides structural support to the manhole. Advantages of Polyurethane Foam Injection: 

Minimal Disruption:

Unlike traditional excavation, polyurethane foam injection requires only small access points, minimizing disruptions to traffic and the community.

Time and Cost Efficiency:

The quick application process and reduced labor requirements make foam injection a cost-effective option.

Longevity and Durability:

Polyurethane foam is highly durable and resistant to chemicals, ensuring a longer lifespan for the repaired manhole.

Environmental Benefits:

The foam is environmentally inert, posing no risk to soil or water quality.


Foam injection can be used for a variety of manhole repair scenarios, including leaks, cracks, and soil stabilization.

1. Assessment:

The first step involves a thorough inspection of the manhole to identify the extent of the damage and the appropriate injection points.

2. Preparation:

The area surrounding the manhole is prepared, and the injection points are drilled.

3. Injection:

The polyurethane foam is injected through the access points, expanding to fill voids and stabilize the soil.

4. Curing:

The foam cures quickly, providing immediate structural support and sealing off leaks.

5. Final Checks:

A final inspection ensures the effectiveness of the repair.


Polyurethane foam injection has revolutionized the way municipalities approach manhole repairs. By offering a no-excavation, cost-effective, and efficient solution, this method addresses the challenges of deteriorating manholes while minimizing disruption to communities. As cities continue to invest in innovative infrastructure maintenance techniques, polyurethane foam injection stands out as a valuable tool in ensuring the longevity and reliability of critical systems.


Polyurethane foam injection is versatile and can be used for various types of manhole damage, including cracks, leaks, and soil stabilization.

The foam cures rapidly, usually within a few hours, providing quick results.

Yes, polyurethane foam is environmentally inert and poses no risks to soil or water quality.

Absolutely, using foam injection as a preventive measure can extend the lifespan of manholes and prevent potential issues.

While polyurethane foam is effective for many scenarios, a professional assessment is necessary to determine its suitability for specific cases.

Poly-Mor Canada Inc. is a leading provider of cutting-edge infrastructure repair services, operating in major cities across Canada. With a strong presence in Edmonton, Calgary, Winnipeg, Vancouver, Toronto, and Halifax, Poly-Mor specializes in innovative solutions like polyurethane foam injection for manhole repairs. As a trusted partner in maintaining municipal infrastructure, we are committed to delivering top-notch services that ensure the safety, durability, and efficiency of critical systems. Whether it’s rehabilitating manholes or addressing other infrastructure challenges, Poly-Mor’s expertise and extensive geographical coverage make it a go-to choice for cities aiming to enhance their infrastructure’s resilience and longevity.

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