Cavity Drain Membranes (Type C Systems)

A ‘Type C’ Waterproofing System is a maintainable basement waterproofing solution for new-build basements, refurbishment and retrofit projects. The Type C System comprises of a Cavity Drain Membrane, Drainage system, Package Pump and Control System.

Benefits of a Cavity Drain System

In principle a cavity drain membrane system allows moisture or running water to travel behind the membrane within a controlled drainage system.  A cavity drain system requires minimal preparation and disturbance to an existing substrate.

‘Type C’ Waterproofing – British Standard 8102:2009

British Standard 8102:2009 (BS8102:2009) ‘Code of practice for protection of below ground structures against water from the ground’ defines ‘Type C’ waterproofing as “drained protection”.  where the structure itself provides primary resistance against water penetration and incorporates a drained cavity system within the basement structure.

Delta Cavity Drain Membranes

Our extensive range of cavity drain membranes protect your property against the damage of water ingress caused by hydrostatic pressure (groundwater pressure). Our membranes can also be used as protection against rising damp as well as being gas proof.

Internal Cavity Drain Membranes

Our 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 our Polysil TG500 anti-lime treatment.

30 Year Product Guarantee

Our membrane systems can come with a thirty year product guarantee as long as it is installed by one of our registered installers. The guarantee covers the membrane and ancillary components, (With the exception of sump pumps), which should be covered by a separate service agreement. Based on experience, accelerated ageing tests and a quality manufacturing system to ISO 9001, the DELTA® range can also be guaranteed with confidence.

They can also provide installation guarantees, which can be further supported by insurance cover if required. The period of guarantee offered is normally up to 10 years and there is a small premium required for this facility.

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