Commercial Tanking

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Cavity drain membranes provide an alternative to conventional cementitious tanking systems, which work by holding the water back. Cavity drain membranes work on the principle of allowing water to continue to penetrate the structure but control it in the air gap and divert it to a suitable drainage point.

They do not allow pressure to build up against the internal construction and the air gap behind the membrane allows the structure to breathe and to some extent to dry out. The membranes are lose laid on floors and fixed to walls using special plugs and sealing materials, with little or no preparation required to the substrate. Once the membrane has been fitted, wall surfaces can be dry lined or plastered directly and floors can be screeded or a floating dry board system installed.

Typical areas of use:

• Barn conversions

• Existing basement waterproofing

• Cellar conversions

• Structural waterproofing

• Retrofit

• New Build

• Damp proof membranes

• Gas barriers


Isola is the original inventor of studded membrane and was founded in 1940. The Isola Group has since grown to become one of the world leaders in the field of waterproofing membranes for the construction industry. Isola has also produced many millions of square meters of membrane products worldwide and through their research and development, continues to be at the cutting edge of innovation and technology in this field.

Triton Systems has been historically linked with Isola Platon since 1995 and in 1998 took over the U.K and Ireland operations to become the sole distributor and promoter of Isola Platon membranes and components. Platon membranes, together with Triton’s own extensive range of water proofing and damp proofing products and water drainage systems give the specifier and installation contractor the complete basement and above ground waterproofing system that is unique within our construction industry.

Isola Platon Cavity Drain Membranes

Platon Cavity Drain membranes “System Platon” are made of high-density studded polyethylene sheets (HDPE) and Polypropolene (PP), which are impervious to water and are vapour proof. When placed against structures the studs form permanent cavities between the structure and the internal shell. They can be used internally or externally to drain and control water and damp ingress.

“System Platon” is not a tanking system. The term “tanking” originates from the industrial process of lining structures with a waterproof material, which were applied either externally (on the positive side) or internally (on the negative side).

Tanking materials such as multi-coat renders, cementitious waterproofing slurries, asphalts and liquid applied bitumen coatings, rely on either a mechanical or chemical bond directly on to the substrate and work by holding water back. The majority of these are vapour permeable.

Walls in the majority of circumstances are not engineered to withstand the bending stresses applied when a negative pressure barrier tanking system is used to hold back water pressure. Brick is very strong in compression but weak in tension.

Traditionally in the United Kingdom cementitious tanking systems are applied to below ground structures, but if the structure is subjected to hydrostatic water pressure, the resulting bending stresses are often far too great for the barrier system to cope with and therefore de-bonding or cracking, resulting in failure, will occur.

The installation of Platon membrane doesn’t change the status quo and therefore Platon Cavity membranes are ideally the most suitable and economical method of providing an effective and long lasting waterproofing system that is also sympathetic towards building structures. For those seeking maximum assurance ‘System Platon’ is considered to be the most trouble free.

What is Tanking? Read More