Filtration / Drainage

Filtration / Drainage

Drainage and filtration layers are used in civil applications to remove moisture or fine particles from the system. Geosynthetics provide a widely accepted, effective and economic alternative to traditional aggregate & sand filtration layers. TYPAR® Geosynthetic materials are manufactured using a heat-bonded process to create consistent filtration characteristics utilized in a variety of markets, be it industrial filters, geocomposites, or underground drainage layers.


TYPAR Geosynthetics are used extensively in critical structural drainage applications such as basements, bridge abutments and retaining walls, replacing porous concrete blocks, no-fines concrete and other conventional materials.

Typical applications include:

  • AASHTO M288 
  • Subsurface Drains
  • Retaining Wall
  • Permeable Paving 
  • French Drains
  • Porous surface layers
  • Drainage Composites

The primary design requirement of a filtration layer for civil engineering applications is the development of a graded filter layer in the subgrade soil to maintain separation and eliminate the risk of soil mixing or ‘pumping'. TYPAR Geotextiles promote development of such filter layers because its uniquely bonded fibers create a pathway that resembles a well-graded aggregate filter. TYPAR Geotextiles provide an effective filter structure since it has both higher permeability rates than adjacent construction soils and the ability to retain fine soil particles, minimizing the piping of subgrade soils.

The process of manufacturing TYPAR fabrics heats the continuous PP fibers and bonds the strands together under pressure to create the geotextile fabric. Bonded fabrics have predictable water flow rates under compaction, eliminating any irregularity of performance when compaction in the field. TYPAR Geotextiles will provide the same flow rates in the lab or on the job site, eliminating future clogging and costly project damage.

Design Considerations

  • Soil conditions
  • Hydrology
  • Hydrogeology
  • Load conditions


TYPAR Geocomposite drains are manufactured by combining geotextiles, nets, and membranes in various combinations to maximize performance and optimize installation efficiency.  Fiberweb utilizes modern fabric technologies, resin additives, and manufacturing processes to maximize permittivity into the composite and increase laminar flow characteristics.  Advancements in our manufacturing processes allow for thinner composite materials with improved performance characteristics and new polymer mixtures to maximize key performance characteristics.

TYPAR Geocomposites Are:

• Durable for installation survivability

• Stable under compaction

• Resist Chemical Degradation

The Geotextile Filter:

• Optimizes AOS to allow porosity without releasing fine particles
• Provides sustained performance without clogging
• Incorporates modern technology to minimize restrictive elongation into the drainage net
• Utilizes modern polymeric additives to optimize performance characteristics

Our geocomposite drains have a proven track record to withstand the test of time, with over 40 years of proven performance across the globe. 

The benefits of using TYPAR Geocomposite drains include:

• high-volume flow for both gas and liquid
• lightweight and easy to install
• cost-effective replacement for traditional methods utilizing natural resources
• manufactured to the highest standards utilizing state-of-the-art technology
• Reduced footprint by minimizing the use of natural materials
• lower transportation, material costs, and installation costs



Typical applications for TYPAR geocomposite drains:

• Highways: vertical drains collect the lateral flow of surface and ground water.  Utilize FrostBarrier to stop the damaging freeze/thaw affect of water in pavements.

• SaltBarrier protects vegetation from the capillary rise of salt water into coastal planting areas.

• Retaining walls and structures: to avoid backfill saturation and reduce pore water pressure.

• Engineered landfills: transportation of moisture and gas to protect the liner system.

• Tunnels: seepage interception between the tunnel lining and rock face.

• Foundation Protection: vertical and horizontal drains.

• Roof gardens: lightweight geocomposites with high laminar flow


TYPAR Geotextiles
Grass & Ground Reinforcement
TYPAR C-Class Geotextiles
TYPAR Geotextile 3100T