At Cavity Drainage System, we specialise in designing and installing high-performance water management systems in Derbyshire and across the UK to protect below-ground structures.

Our systems are crucial for keeping basements, cellars, and underground spaces dry and habitable, effectively managing moisture and preventing water ingress. Whether you’re planning a new build or need to retrofit an existing structure, our expert team provides tailored solutions that meet BS 8102 standards.

With our comprehensive approach, you can trust that your property will remain moisture-free and structurally sound for years to come.

What Are the Benefits of Installing a Cavity Drainage System?

Installing a cavity drainage system offers effective water management by controlling moisture without trapping it inside walls, making it ideal for new constructions and retrofits. These systems cause minimal disruption during installation, as they are installed internally.

They offer long-term protection against water damage and mould and are maintenance-friendly thanks to accessible drainage channels and sump systems. Moreover, cavity drainage systems meet BS 8102 standards, ensuring regulatory compliance and reliable moisture control.

What Are the Key Components of a Cavity Drainage System?

A cavity drainage system consists of several critical components, including:

• Cavity drain membrane – A dimpled plastic sheet that creates an air gap, allowing water to flow freely along the wall.
• Drainage channels – Installed at the base of walls to collect water and direct it towards the sump and pump system.
• Sump and pump system – Safely removes collected water from the structure to maintain a dry environment.
• Internal wall lining – Added over the membrane to create a dry, habitable space.
• Ventilation systems – Helps prevent condensation build-up and maintains air quality in basement areas.

How Much Does a Cavity Drainage System Cost?

The cost of a cavity drainage system in the UK ranges from £25 to £50 per m², with a complete system for a 5m x 5m basement costing around £1,451.85 excluding VAT.

Additional costs include sump and pump servicing (between £200 and £400 annually) and professional installation fees, which vary depending on site conditions and complexity. The cost is primarily determined by the area size, materials used, and installation complexity.

Contact Cavity Drainage System to get customised prices for installing cavity drainage systems on your property.

How Is a Cavity Drainage System Installed?

The installation process of a cavity drainage system begins with a site assessment to evaluate moisture levels and structural conditions. After planning, surface preparation involves cleaning walls and filling cracks to ensure optimal adhesion.

The membrane is then fixed to walls and floors using special plugs, creating a continuous moisture barrier. Drainage channels are installed at the base of the wall to collect water and connect to the sump pump for removal.

Finally, wall and floor finishes are applied to create a usable, dry space, followed by testing to ensure the system’s efficiency.

How to Maintain a Cavity Drainage System?

Maintaining a cavity drainage system involves regular inspections to check the membrane integrity and ensure drainage channels are unobstructed. Sump pumps should be tested periodically to confirm operational efficiency, especially during wet seasons.

Cleaning the drainage system regularly helps prevent blockages, and professional servicing ensures the system remains in optimal condition. Additionally, installing monitoring systems like alarms can alert you to pump failures or water accumulation, allowing for prompt maintenance.

What Are the Typical Applications of Cavity Drainage Systems?

Cavity drainage systems are commonly used in various construction scenarios to manage moisture and water ingress, including:

• Basement conversions – Turning damp areas into habitable spaces such as offices, gyms, or storage rooms.
• Cellars – Maintaining structural integrity by preventing moisture buildup.
• Underground parking and commercial properties – Protecting walls and floors from water seepage.
• Tunnels, subways, and subterranean structures – Keeping passageways dry and safe for continued use.
• New builds and retrofits – Ensuring comprehensive moisture management across a wide range of settings.

How Long Does a Cavity Drainage System Last?

A cavity drainage system is designed for long-term durability, with membranes lasting 25-50 years when properly maintained. Pumps generally last around 7-10 years, depending on usage and maintenance.

Factors such as installation quality, environmental conditions, and regular upkeep significantly influence the system’s longevity. Key indicators of wear include water pooling, mould growth, and reduced pump performance.

Contact Cavity Drainage System to get a consultation on best practices for peak durability of cavity drainage systems.

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Make sure you contact us today for a number of great cavity drainage system services in Derbyshire.

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