Wrimco Drainage Sheet is a dimpled plastic sheet that provides effective drainage and waterproof membrane protection on foundation walls and other underground structures. It is a protection board for waterproofing sheet membrane and waterproofing liquid membrane.
The integrated non-woven geotextile covering the dimples prevents soil particles blocking the drainage sheet, creates an air gap for reliable ventilation and allows inflow and with its dimple structure effectively captures and transports high water volumes and resists high loads from earth and formwork.
It performs a multi-faceted role by providing protection for waterproofing systems and managing sub-surface water around building foundations. Soil backfill is retained by a filter fabric while allowing water to pass into the drainage core providing hydrostatic relief. Collected water is then conveyed to a proper collection system.
It consists of an impermeable polymeric sheet cuspated under heat and pressure to form a high flow dimpled drainage core. Cuspation/dimples can be on one side giving a flat surface on the opposite side or cuspated/dimpled on both sides. The core is then bonded to a layer of non woven filter fabric. The filter fabric retains soil or sand particles as well as freshly placed concrete or grout, allowing filtered water to pass into the drainage core.
The 18mm drainage sheet provides an additional void space between the wall/wall membrane and Drainage Composite for air and water to circulate. In addition it maintains a very high flow rate while providing a higher compresive strength for greater depths.
Installed either vertically or horizontally.
Held in place by either taping, nailing, gluing or simply overhanging over the wall while back-filling takes place.
Installed with the geo-textile facing the back-fill.
Joined by simply butting edge to edge and overlapping the geotextile overhang and securing with reinforced canvas tape. Alternatively overlap the cuspate core by 50mm and secure geo-textile as previous.
Backfill with free draining fill taking care not to disturb or damage the drainage sheet.