When stone is placed on top of a soft subgrade, the load often causes intermixing of the two layers. This results in the contamination of the stone layer which can lead to a loss of bearing strength, causing the surface to rut and deformation at the sub-base/subgrade interface to occur. Terram geotextiles provide an effective solution to this problem allowing the construction of a stable granular layer over soft foundation soils.

The product comes in several models with different physical characteristics to meet projects various technical conditions, the models are T700, T900, T1000, T1300, T1500, T2000, T3000, T4000 and T4500.

Standard Terram geotextiles are perfect for preventing fines entering into granular or geosynthetic drains, such as open geocellular units.

Terram filters/separators are used extensively in the construction of:

• Paved and unpaved roads

• Railways

• Car parks and hardstandings

• Cycleways and footpaths

• SuDS installations

• Green roofs

For more detail please see the following product literature.