Woven vs non-woven geotextile fabric: which one to choose

The basic difference

A woven geotextile is flat or round PP/PET tapes woven into a tight grid — strong in tension, used mainly for reinforcement and separation on weak subgrades, haul roads and embankments. A non-woven geotextile is continuous fibres needle-punched into a felt-like sheet; its open pore structure makes it the fabric for filtration, drainage and cushioning. They are not two grades of one product — they do opposite jobs, which is why people who treat them as interchangeable get failures.

Strength vs permeability

Woven fabric carries high tensile strength at low stretch, so it spreads loads and stabilises soft ground — but water crawls through it. Non-woven lets water pour through while holding back fines, which is why it goes under HDPE geomembranes and wraps around drains. The rule is blunt: if the job is to carry load, woven; if the job is to filter and drain, non-woven.

Geotextile types and classes

There are really only two types of geotextile by construction — woven and non-woven — but specs layer survivability classes on top, and the labels trip people up. AASHTO/road specs grade geotextiles as Class 1, 2 or 3 by survivability (Class 1 toughest); a Class 2 geotextile is the common middle grade for routine separation and stabilisation. Some agency specs add Type 1–5 designations, and a few (PennDOT, for instance) call out a Class 4 Type A geotextile or a Class C grade for a specific drainage or filtration duty. Those classes set minimum strength and puncture values — they don't tell you woven or non-woven on their own. Read the class for the survivability requirement, then pick the construction (woven vs non-woven) that does the actual function.

Typical applications

Use woven geotextile for haul roads, parking yards, embankments on soft soil and basal reinforcement. Use non-woven geotextile for subsurface and French drains, filter layers behind retaining walls, geomembrane protection cushions and erosion control. Plenty of jobs use both — woven for strength below, non-woven as the separating/filter layer.

How to spec it

Match the grade to the design load. For woven, the number that matters is tensile strength (12 kN/m, 25 kN/m). For non-woven, it's GSM and pore size, plus the survivability class. Send the application and we will recommend a grade and supply matched rolls.