How to Prep and Install Geotextile Membranes, Woven and Non Woven

How To Prep and Install Geotextiles

17 December, 2025

A Practical Guide for Woven and Non Woven Membranes

Correct preparation and installation make a noticeable difference to how well a geotextile performs. A well-laid membrane keeps layers separate, supports drainage, reduces movement in the build up and protects the surface above. This guide covers choosing the right fabric, preparing it on site and installing it safely and cleanly.

Choosing the Right Type

The membrane you choose depends on loading, ground strength and drainage needs.

Woven

Use a woven membrane for stabilisation and reinforcement on higher traffic areas such as driveways, access tracks or soft sub grades. Woven fabrics have high tensile strength but offer limited permeability, so they are not suited where filtration is the priority.

Non Woven

Use a non woven fleece for separation and filtration on domestic projects, footpaths, patios, French drains, soakaways and landscaping. Non woven membranes allow water to pass through efficiently while preventing fines from entering clean stone layers.

If you expect both weak ground and drainage demand, a woven layer can be paired with a non woven layer, but most domestic builds only need one membrane type.

Preparing Your Geotextile

Clean preparation leads to a cleaner installation.

Use a sharp Stanley knife with fresh blades. Blunt blades snag the fabric and cause fraying.
Light non woven membranes can be cut with sharp scissors, but anything higher GSM should be cut with a knife.
Never use scissors on woven membranes.
Keep the roll dry and out of direct wind while cutting to avoid it pulling or twisting.

Unroll the membrane close to the installation area so it stays manageable.

Cutting the Membrane

Woven

Lay it in position first, then trim edges with a sharp knife. Woven strands can fray easily, so cut cleanly and avoid dragging the blade. Handle the membrane carefully once cut.

Non Woven

Lay the fleece flat and have someone hold it steady while you cut. A straight, confident cut with a sharp knife gives the cleanest edge. Non wovens are more forgiving and do not unravel in the same way woven membranes do.

Installing the Geotextile

With the membrane cut and ready, prepare the ground:

Remove vegetation: grass, shrubs, stones and loose debris.
Level the ground: fill dips and trim high spots so the membrane sits flat.
Lay the membrane: roll it out and smooth it down so it is tight to the formation.
Secure it: use fixing pegs or steel pins, spaced roughly one pin per metre along edges and overlaps.
Add the overlay: once fixed, place the aggregate or decorative surface directly over the membrane.

Keeping the fabric flat and tensioned helps it perform properly by preventing folds, bridging and unwanted movement as the build progresses.

How To Prep and Install Geotextiles