BS Specialist Products is an approved supplier for Triton’s comprehensive range of Platon cavity drainage products. Cavity drain membranes provide an alternative to conventional cementitious tanking systems, which work by holding the water back.

The Platon cavity drainage membranes are easy to apply and 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.

BS Specialist Products focus on finding the right waterproofing systems suitable for the project. The product range they supply include pumps, sumps, drainage channels and alarms. All products come with fully-accredited BBA approval.

Typical areas of use for cavity drainage systems include:

  • Barn conversions
  • Existing basement waterproofing
  • Cellar conversions
  • Structural waterproofing
  • Retrofit
  • New Build
  • Damp proof membranes
  • Gas barriers

Platon P20

High capacity drainage membrane recommended for use on all floor applications below ground, due to its ability to control free flowing water. The deep stud profile is designed to resist blockages caused by lime deposits. Product features include:

  • Heavy duty, deep studded (20mm) HDPE cavity drain membrane.
  • Principally used on floors.
  • For areas subject to high volume water penetration.
  • Impermeable to water, gas and water vapour.


Platon Plaster Base

Provides a cavity drainage solution that allows plaster to be applied directly to the exposed membrane. It can be installed on internal walls and vaulted ceilings above or below ground level. The substrate remains visible through the clear membrane for precise fixing. It is suitable for use with sand and cement renders and most lightweight and renovating plasters. Product features include:

  • 5mm HDPE cavity drain membrane for direct plastering.
  • Unique undercut stud design creates mechanical key for plastering.
  • Single component, no mesh or fabric layer.
  • Impermeable to water, gas and water vapour.


Platon Plaster Mesh

Double-layered cavity drain membrane comprising a studded HDPE layer bonded to an ‘HDPE twist’ mesh layer which forms a mechanical key for most common plasters and renders.
Product features:

  • 8mm HDPE cavity drain membrane with integrated mesh layers for direct plastering.
  • For internal application on walls above or below ground level.
  • Compatible with other Platon membranes.
  • Can be fixed directly to existing wall finishes without the need for extensive hacking off or preparation.


Platon Double Drain

Vertical drainage layer for external basement walls and a protection board to primary membranes. It consists of an impermeable studded sheet, manufactured from high-density polyethylene with a polyethylene filter fabric bonded to the top of the surface of the studs. Channels between the studs form an air gap against the underlying structure. Platon Double Drain forms drainage layers on both sides of the studded core sheet. The filter fabric facing the backfill material ensures the drainage channels are not blocked or obstructed.

  • Can be fixed vertically or horizontally to suit the application.
  • Must be installed over a primary membrane, such as brushed on Bitumen coatings, and fixed to the top edge above the primary membrane, with Platon Double Drain Cramps.
  • Ensure adequate drainage to drainage pipes.


Platon P5

Tough and economical membrane for both remedial and new build construction. Platon P5 is suitable for sub-ground tanking and also for use above ground to isolate walls which are damp or contaminated with salts.
Product features include:

  • Economical 5mm HDPE cavity drain membrane.
  • Suitable for both walls and floors, above or below ground.
  • Impermeable to water, gas and water vapour.


Platon P8

Tough but pliable membrane that can be bent around corners without risk of breaking, even at very low temperatures.
Product features include:

  • Economical 6.5mm HDPE cavity drain membrane.
  • Suitable for both walls and floors.
  • Suitable for use as a Radon barrier.
  • Impermeable to water, gas and water vapour.

Platon Cavity Drain Membranes – Ancillaries

To complement the Platon range of cavity drain membranes, BS Specialist Products stock an extensive range of ancillary products including;

  • Triton fixing plugs and butyl sealing tapes and rope.
  • Triton aqua channel and fittings
  • Triton aqua pumps – aqua pump pro, aqua pump pro plus & with battery back up.
  • Platon overtape and corner strip.
  • Platon top edge mould.