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GEOTEX - NONWOVEN GEOTEXTILE FABRIC
Geotex nonwoven geotextiles fabrics are made from high-quality polypropylene staple fibers that are needle-punched to form a dimensionally stable fiber network. This fabric is used to support separation and stabilization, subsurface drainage, filtration, and cushioning. This fabric meets AASHTO/NTPEP standards.
Non-Woven Geotextile Fabric (Geotex®): Practical Guide to Filtration, Drainage & Separation
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Quick definition: Geotex® non-woven geotextiles are needle-punched polypropylene staple fibers formed into a stable fiber network that lets water flow while holding soil in place. Typical uses: separation & stabilization, subsurface drainage, filtration, and cushioning. These fabrics meet AASHTO/NTPEP standards for civil projects.

How Non-Woven Geotextiles Work
- Filtration: Holds soil fines back while letting water pass—like a coffee filter for dirt.
- Drainage: Needle-punched loft moves water to pipes/outlets, reducing hydrostatic pressure.
- Separation & Stabilization: Prevents subgrade soil from mixing with gravel base.
- Cushioning/Protection: Shields liners/membranes from punctures by sharp aggregates.

Choosing a Fabric Weight
- 4–6 oz: Landscape beds, light drains, and French drains.
- 8 oz: Retaining walls, residential gravel driveways
- 10–12 oz: Liner protection, heavy-duty filtration.
Spec Sheet Terms
- Permittivity: How quickly water passes through.
- AOS: Apparent Opening Size—smaller = finer filtration.
- Grab Tensile / CBR Puncture: Measures strength and puncture resistance.
- UV Resistance: Sunlight tolerance—store covered and install promptly.

Step-by-Step Installation (French Drain)
- Excavate & grade trench with a steady slope to outlet.
- Place 4–6 oz non-woven fabric with overlaps of 12–18 in.
- Add clean, angular aggregate.
- Set perforated pipe and fully wrap stone and pipe in fabric.
- Backfill with native soil in compacted lifts.
- Protect fabric from UV before final cover.
Case Study: HOA Drainage Retrofit
Problem: Old gravel trenches clogged without filtration, causing flooding.
Solution: Contractor installed 4–6 oz Geotex® non-woven, wrapped stone and pipe
completely, and backfilled.
Results: Clear flow at outfalls, no fines in basins, turf recovery, and no rework after first year.