Techdrain geocomposite drainage is comprised of a cuspated HDPE core offering high strengths and high flow rates and a geotextile filter layer on one or both sides. Techdrain can also be manufactured with a full geotextile wrap with core thicknesses available from 6mm up to 40mm. The polypropylene geotextile is bonded to the core and acts as a filter to ensure that backfill fines do not clog the core area and therefore a continuous drainage void is maintained.
Compared with the traditional stone drainage layers, Techdrain geocomposites are much thinner whilst maintaining excellent flow capacity. This offers huge cost and environmental savings on importing and placing expensive fill. Reductions in excavation can be achieved against traditional construction methods and easy and quick manual installation offers further savings on plant & labour.
Block paving drainage
Techdrain geocomposite drainage can be installed horizontally beneath block paving to enhance drainage and prevent the sand layer from becoming too saturated. This is especially important when heavy loads are applied above the block paving and the foundation layer is relatively impermeable (e.g.concrete, roof decks etc.).