Tensar® Biaxial (SS) Geogrids

Biaxial geogrids: then and now

Invented and developed by Tensar over many decades, biaxial geogrids are still in use on a variety of civil engineering projects around the world – particularly in locations where weak soil needs stabilising. Tensar SS20 and SS30 geogrids remain popular geosynthetic products to this day.

How it works

Tensar biaxial geogrids reinforce the soil beneath heavy loads, like slabs or trucks. Geogrids are made from strong, durable materials, forming a grid structure to help distribute weight easily. Placing it under materials like soil and gravel interlocks the surrounding aggregates.

By using a biaxial geogrid, it prevents the ground from shifting, sinking or rutting underneath heavy traffic. The grid's strength spreads the load across a wider surface, reducing maintenance needs while enhancing the bearing capacity of the soil. Biaxial geogrids can also be used to separate aggregates from the geotextile, preventing soil types with a high moisture mixing.

For more information on this, check out our guide ‘what is rutting in the roads’.

Subgrade preparation

Preparing the soil subgrade and levelling it according to standards before installing the biaxial geogrid is key to ensuring it’s been done efficiently. When laying the geogrid, it needs to be placed parallel to your project, with a geotextile membrane laid first if applicable.

Depending on the subgrade and fill, the biaxial geogrid rolls need to overlap between 300mm to 600mm. To hold down this overlap, it can be held down with an aggregate. The filling material should be placed in small layers to avoid damaging the geogrid.