Geo-textile Membranes for Permeable Flooring: What to Know

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Geo-textile membranes form a crucial part of any well-constructed permeable flooring system, helping to manage water flow and sub-base stability. This guide explains when and why you should use a geo-textile membrane, plus practical advice on working with this material for the best results.

What Are Geo-textile Membranes and Why Use Them?

A geo-textile membrane is a strong, flexible sheet—commonly made from spun-bonded or woven synthetic fibres—laid between sub-base layers. Its main role beneath permeable surfaces, such as resin-bound pebble flooring, is to separate the different soil and aggregate layers. This stops the mixing of materials over time, prevents weed growth coming up through the base, and provides added stability while still allowing water to drain through freely.

Installation Tips for Permeable Flooring Projects

To install a geo-textile membrane, start by preparing your sub-base (usually compacted MOT type 3 or a similar free-draining material). Lay the membrane flat, ensuring it covers the entire area, and overlap any joints by at least 300mm to prevent displacement. Once in place, spread washed aggregates—such as the Washed Pebbles for Permeable Floors—on top, before applying your resin-bound system. This practical approach helps reduce long-term maintenance and maximises water permeability.

When Does a Geo-textile Membrane Matter Most?

Using a geo-textile membrane is especially valuable in locations with unstable ground, high rainfall, or where surface movement is likely. It’s recommended for garden paths, patios, driveways, and any area with a risk of weeds or mixing of soil and stone beneath permeable flooring kits like Flowstone.

Related guides

What Sub Base Is Needed For Permeable Flooring

Geo-textile membranes support the longevity and drainage performance of your permeable flooring by providing crucial separation and weed control. For more on building the right sub-base for your resin-bound system, visit our main guide on what sub-base is needed for permeable flooring.