What is geotextile? It is often described as filter fabric, geo fabric, landscape cloth or roading fabric. On our website and in our shop you’ll see products listed as either woven or nonwoven geotextile.
Geotextile is indeed a fabric and is manufactured in a variety of ways. We supply both woven and nonwoven geotextiles. Our nonwovens are manufactured in polypropylene using staple fibres. In the production process needle punching which involves entangling short fibres together using a needle board followed by rolling and heat bonding.
Specifically a geotextile is best described as a permeable fabric used for soil. Applications can include drainage, separation and reinforcement. They are excellent products for these applications but each type or grade can be quite specific.
A nonwoven geotextile in 120 – 150 grams per metre square is best for drainage. This is so the fabric maintains a high flow rate to allow water to pass through without clogging. These light grades are used for trench drains especially. Many years ago woven fabrics were used for drainage but have been replaced by nonwovens for this application.
A nonwoven geotextile in 140 grams per metre square and higher are used for separation and ground reinforcement and also environmental applications such as cushioning between a geomembrane (liner) and earth or rock. Nonwoven geotextiles are often used in erosion control applications and placed between rock and soil. Due to the nature of a heavy weight nonwoven water can be distributed evenly and effectively without creating erosion which would normally take place beneath rock without a nonwoven geotextile in place.
Nonwoven geotextiles are not particularly effective in long-term UV exposure unless very heavy weights and with addition of UV stabilizers. Our general black roading grade nonwoven geotextiles have approximately 12 months of UV protection.
A woven geotextile is manufactured by weaving flat polymers made from either polypropylene or polyethylene. We supply only woven polypropylene geotextiles. Depending upon the weight they are used either as reinforcement or as separation between the earth and aggregate in unpaved roads. These types of fabrics typically do not have great drainage qualities.
Another type of woven geotextile fabric is high strength woven geotextile. These are very heavy grades with good filtration characteristics and are usually measured by strength rather than weight. A high strength woven geotextile can be used to strengthen embankments, retaining walls, under roads between soft soils and pavement. A high strength geotextile provides a combination of high filtration, high strength and separation.
Difference between nonwoven and woven geotextile.