Waterproofing Systems
- Cavity Drain Membranes
- Platon Component Calculator
- Concrete Waterproofing,
Cementitious & Epoxy Systems - The Triton Drainage System
Cavity Drain Membranes

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
Platon Multi
Cavity Drain Membrane for internal use


- BBA approved
- 5mm PP cavity drain membrane
- fast track solution for walls or floors
- suitable for use above or below ground
- impermeable to water, gas and water vapour
Platon Multi can be dry lined on walls, screeded, or finished with a dry board system on floors. Particularly suitable for floors in industrial buildings, as it will transfer loading through screed layers to the underlying concrete floor. Allows contaminated floors to be upgraded.
Platon Multi can be used in conjunction with other Platon membranes and the Triton Aqua Channel and Pump system.
| Technical Data: | |
|---|---|
| Roll size: | 2.05 x 20m x 5mm |
| Sheet thickness: | nominal 0.50mm |
| Stud height (net): | approx. 5.0 mm |
| Unit weight: | 0.45 kg/m2 |
| Softening temperature: | +160ºC |
| Life expectancy: | at least 50 years |
| Air gap volume: | 3.3 litre/m2 |
| Drainage capacity: | max. 2.95 litre/m2 |
| Colour: | clear |
Platon Plaster Base
Cavity Drain Membrane for internal use


- BBA approved
- HDPE cavity drain membrane for direct plastering
- single component, no mesh or fabric layer
- unique undercut stud design creates mechanical key for plaster
- easy to cut, fix and seal
- impermeable to water, gas and water vapour
- compatible with other Platon membranes
Platon Plaster Base 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.
| Technical Data: | |
|---|---|
| Roll size: | 2.0m x 20m x 5mm |
| Sheet thickness: | nominal 0.50mm |
| Stud height (net): | approx. 5.0 mm |
| Unit weight: | 0.48 kg/m2 |
| Softening temperature: | +125ºC |
| Air gap volume: | 3.2 litre/m2 |
| Drainage capacity: | max. 1.84 litre/m2 |
| Life expectancy: | at least 50 years |
| Colour: | natural |
Platon Plaster Mesh

- HDPE membrane with integrated mesh layer for direct plastering
- For internal application on walls above or below ground level
- Compatible with other Platon membranes
Platon Plaster Mesh is a double layered cavity drain membrane comprising a studded HDPE layer bonded to an 'HDPE twist' mesh layer which forms a key for most common plasters and renders. As with other Platon membranes, Platon Mesh can be fixed directly to existing wall finishes without the need for extensive hacking off or preparation.
| Technical Data: | |
|---|---|
| Roll size | 2.0m x 20m x 8mm |
| Studded sheet thickness | 0.7mm |
| Stud height (net) | 8mm |
| Unit weight | 70g/m2 |
| Compressive strength | 150 kN/m2 (15t/m2) |
| Service temperature range | -40ºC to +80ºC |
| Life expectancy | at least 50 years |
| Air gap volume | 5.5 litre/m2 |
| Colour (both layers) | Clear |
Platon P5
Cavity Drain Membrane for internal use

- Economical 5mm HDPE cavity drain membrane
- Suitable for both walls and floors, above or below ground
- Impermeable to water, gas and water vapour
- Compatible with other Platon membranes
P5 is a tough and economical membrane for both remedial and new build construction. It is suitable for sub-ground tanking and also for use above ground to isolate walls which are damp or contaminated with salts.
P5 can be dry lined on walls and screeded or a floating dry board system fitted on floors.
| Technical Data: | |
|---|---|
| Roll size: | 2.07m x 20m x 5mm 2.47m x 20m x 5mm |
| Sheet thickness: | nominal 0.50mm |
| Stud height (net): | approx. 5mm |
| Unit weight: | 0.48 kg/m2 |
| Max. compressive strength: | 180 kN/m2 |
| Softening temperature: | +125ºC |
| Air gap volume: | 3.25 litre/m2 |
| Drainage capacity: | max. 2.4 litre/m2 |
| Life expectancy: | at least 50 years |
| Colour: | black or clear |
Platon P20
Cavity Drain Membrane for internal use


P20 specified to waterproof new basement floor![]()
- BBA approved
- heavy duty, deep studded HDPE cavity drain membrane
- principally used on floors
- for areas subject to high volume water penetration
- impermeable to water, gas and water vapour
P20 is a 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.
| Technical Data: | |
|---|---|
| Roll size: | 2.0m x 20m x 20mm |
| Sheet thickness: | nominal 1.00 mm |
| Stud height (net): | approx. 20mm |
| Unit weight: | 0.95 kg/m2 |
| Max. compressive strength: | 150 kN/m2 |
| Softening temperature: | +125ºC |
| Air gap volume: | 14 litre/m2 |
| Drainage capacity: | max. 13 litre/m2 |
| Life expectancy: | at least 50 years |
| Colour: | black |
Platon Double Drain
Cavity Drain Membrane for External Use

- a membrane system for external basement walls
- which protects underlying waterproofing from backfill damage
- filter fabric layer ensures soil cannot enter membrane cavities
- to impede drainage
Double Drain is installed with the filter fabric facing the backfill. It is fixed mechanically along its top edge using Platon-Cramp, which provides tear resistant fixing points. The Platon Moulding Profile prevents entry of soil and stones between the wall and membrane or into the drainage layer.
| Technical Data: | |
|---|---|
| Roll size: | 2.0m x 15m x 7mm |
| Sheet thickness: | nominal 0.50mm |
| Drainage layer thickness: | approx. 8mm |
| Unit weight: | 0.58 kg/m2 |
| Max. compressive strength: | 200 kN/m2 |
| Softening temperature: | +125ºC |
| Air gap volume: | 4.0 litre/m2 |
| Drainage capacity: | max. 2.3 litre/m2 |
| Life expectancy: | at least 50 years |
| Colour: | black |
Platon Stop
Damp proof underlay for wood and laminate floors laid on concrete



- No need to wait for concrete slab to dry
- Offers 3 times more water vapour resistance than film membranes
- Fast, single application
- Suitable for use under all wood and laminate floors including glue-free systems
Platon Stop provides an effective, single application damp proof underlay for wood and laminate floors laid on concrete. It's equally effective for renovation or new build projects and the tough polypropylene membrane can be laid directly onto a new concrete slab as soon as it is dry enough to walk on. With three times the water vapour resistance than film membranes, it eliminates the need to install a foam underlay. Construction height is only 2.5mm.
Depending upon the moisture content of the floor, Platon Stop is either fixed with damp resistant adhesive tape or a butyl rubber strip. The wooden flooring material can then be installed immediately.
| Technical Data: | |
|---|---|
| Roll size: | 1.25 x 15m x 2.0mm 2.05 x 2.0m x 2.0mm |
| Construction height: | approx. 2.5mm |
| Raw material: | PP (polypropylene) |
| Colour: | Blue |
| Material thickness: | 0.5mm |
| Weight: | 450g/m2 |
| Water vapour resistance: | 1500 m2.s.GPa/kg, or 300 m equivalent air layer |
| Impact sound deadening: | approx. 17dB (with 14 mm parquet) approx. 19dB (with 7mm laminate) |
| Shock cushioning: | approx. 20% (DIN 18032 part 2) |
| Thermal conductivity: | approx. 0.22 W/m.K |
| Flammability: | B2 (DIN 4102) |
Platon Accessories
The following fixings are available for Platon Membrane Installations - please see Platon Product Calculator to estimate quantities required for full roll applications:
| Product Description | Size | Qty/Box |
|---|---|---|
| Platon Plug Seal | 100 per pack | |
| Platon Brick Plugs | 10mm x 75mm | 100 per box |
| Platon Plaster Plugs | 8mm x 70mm | 500 per box |
| Platon Sealing Tape | 2mm x 30mm x 20m | 5 per box |
| Platon Sealing Rope | 10mm x 5m | 10 per box |
| Platon Overtape | 115mm x 1mm x 25m | |
| Platon Corner strip | 150mm x 1.5mm x 10m | |
| Platon Wall/Floor Junction (Black) | 2m strip | 10 per pack |
| Platon Ventilated Wall/Floor Junction (Blue) | 1.3m strip | 12 per pack |
| Platon X Cramps | 60 per box | |
| Platon Top Edge Mould | 2m | |
| Platon Dab Collars | 50 per box | |
| Platon DPC Plain | 400mm x 20m | |
| Platon Sealer | 300ml cartridge | |
| Cotton Fleece Overseal Tape | 1.5mm X 115mm x 25m |

Platon Plug Seal