What Is a Cavity Membrane System and How Does It Work?

If you have a damp cellar in your property, you’ll know how frustrating it can be to have unusable space. Not only is dampness an inconvenience, it can also lead to health issues for you and your family. Persistent exposure to mould and mildew can exacerbate respiratory illnesses. The good news is that cavity membrane systems allow you to waterproof these areas and regain use of the space. This article will explain what a cavity membrane system is and how it works to keep cellars dry.

What is a Cavity Membrane System?

A cavity membrane system is a type of damp proofing designed for use in basements, cellars and vaults. It consists of a polyethylene studded membrane that is installed on all floors, walls and ceilings of the area to be waterproofed.

The membrane has raised studs on one side that create an air gap between the membrane and the wall or floor. This gap allows moisture to drain down into a channel at the base of the wall and be directed into a sump chamber. The sump pump then pumps the water outside of the building.

Cavity membrane systems can be installed in both existing and new build properties. They are ideal for creating additional living spaces in cellars. The installation process causes minimal disturbance to the rest of the property.

How Does a Cavity Membrane System Work?

Unlike tanking systems that aim to block moisture, cavity membrane systems are designed to allow moisture in behind the membrane where it can then be managed. Here are the key steps:

• Installation – The membrane is tightly fitted to the walls, floors and ceiling using mechanical fixings. All joints are overlapped and sealed. Access panels are installed to allow maintenance of the system.
• Moisture drains down – Any moisture in the wall or floor passes between the studs and drains down the cavity into a channel at floor level.
• Moisture is discharged – The water flows along the channel to a sump chamber where it is collected. A sump pump activates automatically to pump the water outside.
• Walls remain dry – With moisture diverted there is no damp on the inner membrane surface, allowing walls to be dry lined or plastered directly.

Benefits of Cavity Membrane Systems

There are several benefits that make cavity membrane systems an excellent solution for damp cellars:

• Effectively keeps walls and floors dry by managing moisture build up.
• Allows use of the space without concern about damp issues recurring.
• Avoid potential health problems caused by exposure to damp.
• Can be installed without underpinning or extensive preparation.
• Walls can be dry lined and decorated soon after installation.
• Adds value by turning unused space into living space.
• Long lifespan of at least 30 years.

Cavity membrane systems provide an efficient way to waterproof cellars. The membrane controls moisture and prevents it from causing damp walls and floors. This allows you to utilise the full footprint of your property and gain extra living or storage space. A cavity membrane system is an investment that provides great returns in terms of usable space and increased property value.