Tanking: Geo-Drain Quattro
Structures that are earth retaining can be damaged by moisture penetration from the outside or by the water under hydrostatic pressure. Tanking and membranes from Delta Membrane Systems are available as geocomposites to deal with such problems. They act as a waterproof drainage layer, and quickly remove the water to suitable drainage around the structure. They prevent the build-up of hydrostatic pressure on the structure and filter the water via an internal polypropylene filter layer. This prevents the fine ground particles from blocking the drainage facility and avoids destabilising the soil.
Delta Geo-Drain Quattro can also be applied over the primary external waterproofing layer on certain types of structure, prior to back filling. The membrane is only fixed along the top edge, and the flange on the edge of the roll is used to lap onto the next section and is sealed using the pre-applied adhesive tape.
The Geo-Drain Quattro has a very high compression strength, 400Kn/M2, and acts as a protection layer over flexible waterproofing. It can be used up to depths of 10m.