Manhole Rehabilitation and Water Sealing for Underground Structures

Manholes, tunnels, tanks and similar underground structures are subjected to water ingress, chemical attack and structural wear over time. We provide specialist manhole rehabilitation and water sealing services to protect these assets and extend their service life.

Why Manhole Rehabilitation Matters

Damaged or leaking manholes allow groundwater to enter the sewer system or allow sewage to escape into the surrounding ground. That can lead to contamination, structural damage, and higher treatment costs. Rehab and sealing help stop infiltration and protect the integrity of underground networks.

What Our Services Cover

Water Sealing of Manholes and Chambers

We apply coatings or injection systems that create a watertight barrier, sealing joints, cracks, walls, and benches.

Tank and Tunnel Sealing

Our methods are suitable not only for manholes but also for tanks, wet wells, and tunnels, applying waterproof membranes or internal linings.

Structural Repair and Coating

Where the concrete or brickwork is deteriorated, we repair the structure first and then apply protective sealing.

Post-Rehabilitation Testing

After sealing, we test for leaks and monitor curing performance to confirm the work is effective.

How We Carry Out Rehabilitation

Assessment and Survey

Using CCTV and inspection, we identify defects such as cracks, spalling, or leaks.

Cleaning and Preparation

The interior is cleaned using jetting or abrasive methods. Loose or damaged material is removed.

Repair of Defects

We fix cracks, voids, delaminations, or poor joints using repair mortars or injection resins.

Water Sealing Application

A lining or applied membrane is installed. Depending on the site conditions, we select epoxy, polyurethane, or polymer systems.

Curing and Verification

The seal is allowed to cure under controlled conditions. Afterwards, we test for water tightness and document results.

Common Methods Used

• Epoxy or Polyurethane Coatings These form seamless membranes over the entire interior.

• Injection Resins Used to seal joints or small cracks under pressure.

• Cementitious Overlays Applied in thicker layers for structural repair plus sealing.

• Sprayed Polymer Linings Ideal for irregular surfaces and fast application.

Benefits to Clients

• Reduced groundwater infiltration and sewage leakage

• Lower maintenance and repair costs over time

• Improved structural stability of underground assets

• Compliance with environmental and regulatory standards

• Minimal excavation or disruption compared to full rebuilds​

Our Expertise

We have experience working across Wales and the West, treating manholes, tanks, tunnels, and chambers. Our team understands local ground conditions, moisture challenges, and regulatory demands. We deliver practical solutions backed by clear reporting and quality guarantees.

When to Rehabilitate a Manhole

Consider rehab if you notice signs like

 

• Persistent leaks or damp interior surfaces

• Cracks or spalling in ring walls

• Infiltration of groundwater into the sewer system

• Structural movement or settlement around the manhole

• Failing benching or damaged pipe connections​

Next Steps

If your site includes underground structures that need protection or repair, we can assess the condition and recommend appropriate water sealing methods. Contact us to arrange a survey or to discuss your requirements. We work to deliver durable rehabilitation without unnecessary disruption.