4 oz Double Punched Non Woven Geotextile Fabric – Drainage & French Drain Fabric
Super Geotextile 4 oz non woven geotextile is a double needle punched polypropylene filter fabric built for drainage. It lets water flow through fast while keeping soil and fines out of your gravel, so French drains, dry wells and drainage trenches keep working for years.
- Double needle punched non woven polypropylene – strong, dimensionally stable and easy to cut.
- High water flow – filters soil while letting water through (140 gpm/ft²).
- Puncture resistant – 300 lb CBR puncture rating protects against rock and roots.
- Mildew & rot resistant – made to last up to 50 years when properly buried.
- Many sizes – from 3' wide drain rolls up to wide pieces for big jobs, plus a 1' x 1' sample.
Common uses
- French drains & drainage trenches
- Dry wells & downspout drains
- Under gravel paths & patios
- Retaining wall drainage
- General landscaping
Which non woven weight do I need?
| 4 oz | 6 oz | 8 oz | |
|---|---|---|---|
| Best for | French drains, drainage, light-duty landscaping | All-purpose: erosion control, under rock & rip-rap, pond underlayment | Heaviest duty: large rock, construction, roads, high puncture risk |
| Grab tensile (ASTM D4632) | 100 lbs | 160 lbs | 205 lbs |
| CBR puncture (ASTM D6241) | 300 lbs | 410 lbs | 535 lbs |
| Water flow (ASTM D4491) | 140 gpm/ft² | 110 gpm/ft² | 90 gpm/ft² |
Need separation and load support under a gravel driveway or road instead of drainage? Look at our woven geotextile. Stopping weeds in beds? Use our Pro Grade 5 oz weed barrier.
4 oz technical specifications
| Property | Test method | Value (MARV) |
|---|---|---|
| Grab Tensile Strength | ASTM D4632 | 100 lbs (0.445 kN) |
| Grab Elongation | ASTM D4632 | 50% |
| Trapezoid Tear Strength | ASTM D4533 | 45 lbs (0.20 kN) |
| CBR Puncture Resistance | ASTM D6241 | 300 lbs (1.33 kN) |
| Permittivity | ASTM D4491 | 2.0 sec-1 |
| Water Flow Rate | ASTM D4491 | 140 gpm/ft² |
| Apparent Opening Size (AOS) | ASTM D4751 | 70 U.S. Sieve (0.212 mm) |
| UV Resistance | ASTM D4355 | 70% strength retained at 500 hrs |
Download the full 4 oz spec sheet (PDF)
Installation tips
- Clear and smooth the area – remove sharp rocks, roots and debris.
- Roll the fabric out flat and snug, without wrinkles.
- Overlap seams 12–18 inches (more on soft ground or slopes).
- Pin the edges and seams to hold the fabric in place while you work.
- Place gravel or rock gently – don’t drop large rock from height onto the fabric.
Don’t forget the pins. Hold your fabric in place with our 6" galvanized circle top landscape pins or 11 gauge galvanized landscape staples.
FAQ
How do I figure out how much I need?
Multiply width x length for square feet, then add extra for seam overlaps and for wrapping up the sides of a trench. For a French drain, the fabric width should cover the bottom and both sides of the trench plus an overlap on top.
Woven or non woven?
Non woven is for drainage and filtration – water passes through quickly. Woven is for separation and stabilization under driveways and roads where water flow matters less.
Will this stop weeds?
It can help slow weed growth, but for planting beds our Pro Grade 5 oz weed barrier is the better choice.
Not sure which size?
Order a 1' x 1' sample first to see and feel the fabric.
