Cavity drain membrane
The Type C cavity drain system comprises a cavity drain membrane, drainage system, package pump and control system. It is a maintainable basement waterproofing solution for new-build basements, refurbishment and retrofit projects.
Type C waterproofing is defined as “drained protection”, where the structure itself provides primary resistance against water penetration and incorporates a drained cavity system within the basement structure.
Delta's internal membranes are used as a Type C waterproofing system forming a waterproof barrier as well as adequately draining the water to a suitable outlet, in most cases a sump pump drainage system.
Before a cavity drain membrane is laid or fitted on walls and floors constructed of new concrete, the concrete surface should be treated to reduce the risk of leaching of free lime and/or mineral salts and to avoid the obstruction of the drainage system. This can be achieved by using Delta's Polysil TG500 anti-lime treatment.