the DELTA system can cope. The DELTA membrane has an elongation break of greater than 50%. Speed As there is little or no preparation required the system is by comparison quick to install. When dry finishes are used the system is a ‘fast track’ solution. Decoration does not need to be delayed as there is no drying process. DELTA Membrane Systems is the U.K. arm of the world’s largest producer of cavity drain systems. The market leading DELTA brand has a track record approaching three decades. The DELTA systems have been used successfully in many situations in the U.K, from small domestic basements up to major waterproofing projects such

as London Underground stations. There is rarely a dampness or water ingress problem that falls outside the scope of the capabilities of the DELTA system.

What are DELTA Systems

With the introduction of British Standard BS.8102:2009 ‘Protection of below ground structures against water from the ground’, the use of


cavity membranes has been generally accepted in the U.K. DELTA Systems are a complete range of products which are used together to solve many of today’s problems in both new and old construction. DELTA Systems can easily deal with aggressive ground water conditions, where basements are liable to flooding, or indeed where simple dampness, contamination or salting problems are prevalent. Other more diverse applications include turf covered roofs, barn conversions, tunnel linings or even as a barrier against radon gas.

The main components of the system are the membranes themselves. These are manufactured from virgin high density polyethylene which is thermally and alkaline stabilised. The stud heights vary from 3mm for DELTA-FM, 8mm for DELTA MS 500 & DELTA PT to 20mm for DELTA MS 20. The cavity created by the membrane contains between 2.1 and 10 litres of space respectively. This is known as either the ‘Air Gap’ or the ‘Drained Cavity’, in wet situations.

The Membranes


DELTA-MS 500 This is used for walls and floors, and is supplied in 2.4, & 2m x 20m rolls. This membrane can be used for light water ingress situations, and is available yellow (DELTA-FM), and clear. The MS 500 clear aids the selection of good fixing points in more difficult application i.e. random stone and friable brickwork. The sealed DELTAPlug or Qwik Seal Plug is used to secure System 500, the centre shank of this fixing is also used for subsequent dry lining applications.

DELTA PT LATH This membrane has a mesh incorporated on the internal face which is attached by a thermic welding process at the time of manufacture. The sealed PT fixing plug is used to secure the