London & Surrey
Drain Patching

Drain patching is an excellent solution for homeowners and businesses looking for a quick, affordable, and non-invasive repair option. It is particularly beneficial for properties where excavation would be difficult or disruptive.

However, it’s not suitable for every situation. Severely damaged or collapsed drains may require more extensive repairs. That’s why a professional assessment is essential before proceeding.

Some home insurance policies cover sudden drain damage, such as a collapsed pipe or burst drain, but usually not blockages caused by misuse. Always check your policy details, and we can provide documentation of repairs if needed for claims.

When carried out by experienced drainage specialists, drain patching can provide a durable, long-term solution, typically lasting 10–20 years or more. The exact lifespan depends on factors such as the quality of the installation, the type of pipe, and the conditions surrounding the drain.

The resin used in drain patching is highly durable and resistant to:

• Corrosion – Protects metal or older pipes from rust and degradation.
• Root intrusion – Creates a strong barrier that prevents tree or shrub roots from penetrating the pipe.
• Water pressure – Maintains integrity under normal and fluctuating water flows.
• Chemical damage – Resistant to typical household chemicals and waste that pass through the drainage system.

Proper preparation and installation are key to longevity. Pipes must be thoroughly cleaned and inspected before patching, ensuring the resin adheres correctly and forms a seamless, watertight seal.

Regular maintenance and inspections—such as periodic CCTV surveys and drain cleaning—can help identify potential issues early, keeping the patch in top condition and further extending its lifespan. With good care, a drain patch can be a cost-effective, long-term alternative to full pipe replacement.

While roots naturally seek water, you can reduce risk by:

• Planting trees away from drain lines
• Regular root cutting or high-pressure jetting
• Scheduling CCTV surveys to detect early intrusion
• Using root-resistant pipe materials when replacing drains

Understanding the difference between drain patching and drain lining is essential when deciding on the best repair method for your drainage system. Both are no-dig, trenchless solutions, but they serve different purposes depending on the condition and extent of the pipe damage.

Drain Patching

Drain patching is a targeted repair method designed to fix a specific damaged section of pipe. Using a resin-impregnated liner, the patch is applied directly to the affected area, creating a strong, watertight seal.

Ideal for:

• Small cracks or fractures
• Minor leaks at joints
• Localised root ingress
• Pipes that are mostly intact but have isolated damage

Drain lining, also known as cured-in-place pipe (CIPP) lining, involves relining an entire pipe or long sections with a resin-saturated liner. Once cured, it forms a seamless, durable pipe within the existing pipe, effectively renewing the drainage system.

Ideal for:

• Pipes with widespread cracks or corrosion
• Multiple damaged sections
• Older pipes showing general wear
• Pipes prone to frequent blockages

A professional drainage engineer will determine whether patching or lining is the most suitable solution, usually after a CCTV drain survey. Key considerations include:

• The extent of the damage – Is it a small, isolated issue or widespread deterioration?
• Pipe condition and material – Older or fragile pipes may benefit from full lining.
• Accessibility – Some sections may be harder to reach, influencing the choice of repair.
• Cost and convenience – Patching is cheaper for minor damage, while lining can prevent repeated repairs over time.

In many cases, patching is a fast, effective, and affordable solution for localised problems, while lining is a more comprehensive approach for long-term drainage protection. Understanding the difference ensures you choose the right repair method for your property and avoid unnecessary disruption or expense.

Regular inspections help prevent major issues. For most homes and businesses:

• Minor maintenance: every 1–2 years
• Older or problematic drains: annually
• After severe weather or flooding: immediately

Inspections using CCTV technology can detect hidden damage before it becomes expensive.

Drain patching relies on specialist materials designed to repair damaged pipes quickly, effectively, and without excavation. The main materials used include:

1. Resin-Impregnated Liners
   • Flexible liners are soaked in epoxy or polyester resin, which hardens once cured.
   • The resin forms a strong, seamless, and watertight seal inside the damaged pipe.
   • Liners are cut to the exact length of the damaged section for a precise fit.
2. Inflatable Packers
   • Used to position the liner accurately within the pipe.
   • The packer inflates, pressing the resin-soaked liner against the internal walls of the pipe.
   • Once the resin cures, the packer is deflated and removed.
3. Curing Equipment
   • Heat, hot water, or UV light may be used to harden the resin quickly, depending on the type of patch.
   • Ensures a durable and long-lasting repair that bonds fully to the pipe surface.
4. Cleaning Materials
   • Pipes are cleaned with high-pressure water jets to remove debris, grease, and sediment.
   • A clean surface is essential for the resin to adhere properly and create a watertight seal.

These materials work together to create a robust, corrosion-resistant, and flexible repair, making drain patching a reliable long-term solution for localised drain damage.

The drain patching process is straightforward but requires specialist equipment and expertise to ensure a high-quality, long-lasting repair.

1. CCTV Drain Survey

Before any repair work begins, a CCTV drain inspection is carried out. This allows engineers to:

• Identify the exact location of the damage
• Assess the condition of the pipe
• Determine whether patching is the best solution

2. Drain Cleaning

The pipe is thoroughly cleaned using high-pressure water jetting. This removes debris, grease, and obstructions, ensuring the patch adheres properly to the pipe surface.

3. Patch Preparation

A liner is cut to the required size and soaked in a special resin. This resin is what forms the solid repair once cured.

4. Patch Installation

The patch is wrapped around an inflatable packer and inserted into the drain. Using CCTV guidance, it is positioned precisely over the damaged section.

5. Inflation and Curing

The packer is inflated, pressing the patch firmly against the pipe walls. The resin is then left to cure, which typically takes a few hours.

6. Final Inspection

Once cured, the packer is removed and another CCTV inspection is carried out to ensure the repair has been successfully completed.

Yes, the drain patch itself comes with a 12-month guarantee, ensuring the materials used are durable and perform as expected under normal conditions.