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WPA Drainage Cell - Technical Data Sheet

Product Description

WPA Drainage Cell is a two-core drainage sheet consisting of a non-woven geotextile filter layer thermally welded to a water impermeable, recycled HDPE (High Density Polyethylene) drainage membrane. Newton 408 EcoDrain provides outstanding drainage and protection to the outside face of basement walls, preventing the build-up of water pressure and protecting the structure from aggressive water, chemicals and toxins.


Recommended for:

  • As the drainage layer of an externally applied waterproofing system when used in conjunction with sheet applied or liquid applied external tanking membrane to BS8102:2009

  • Protection of the structure from aggressive chemicals in the ground water

  • To prevent the build-up of ground water to retaining walls


Features and Benefits

  • Recycled and recyclable HDPE core

  • Prevents water pressure from bearing against the structure

  • Resistant to all chemicals normally found in the ground

  • Withstands stresses and movement acting as a slip membrane as the backfill settles

  • Extremely strong material, minimising the risk of damage when backfilling even when no protection board is used

  • Very high compressive strength

  • ECO manufactured with no production waste

  • Suspended soil particles (fines) are filtered out by the geotextile layer

  • Quick and easy to install with a range of ancillary fixing and installation products


New-Build Waterproofing design

  • Build new structures to the requirements of BS8102:2009. Further guidance is available in CIRIA Report 139 – Water Resisting Basements.

  • Use WPA Waterstop at construction joints as part of an effective multi-staged approach to the waterproofing.

  • Carry out a geotechnical survey to evaluate soil characteristics and groundwater conditions. Great care should be taken when considering waterproofing that requires the permanent removal of the ground water to be effective. See BS8102:2009 Section 5. for further guidance.

  • The slotted or perforated drainage pipe to the base of an externally applied drainage membrane should be maintainable and graded to an open outlet below the level of the lowest slab. If risk of surcharge exists a pumped back flow protection device should be used. See BS8102:2009 Section 6.4 for further information.

  • Slotted or perforated drainage pipes should be maintainable.

  • Include accessible jetting ports at regular intervals with at least one jetting port to each elevation.


Installation Procedure

  • Apply a WPA/Bayset waterproofing membrane to walls in accordance with the product data sheets.

  • WPA Drainage Cell is supplied in 2m wide sheets. If the foundation wall is less than 2m in height it is possible to fix Newton 408 EcoDrain horizontally with no laps. For walls over 2m fix Newton 408 EcoDrain in vertical sheets with the Geotextile fabric layer facing the operative and the black drainage layer against the wall being treated. Ensure that the membrane is fitted level.

  • Overlap subsequent sheets of Newton 408 EcoDrain ensuring that the filter fabric of the next sheet overlaps the previous studded core - a section of filter fabric is separated from the drainage core for this purpose.

  • Place slotted or perforated drainage pipe to the base of the foundation so that the top of the drain is below the top of the internal slab level. Place the drain within a bed of clean graded 20mm stone surrounded by a sheet of Geotextile filter fabric ensuring that enough Geotextile is available to lap to the WPA Drainage Cell to give continuity of the filter fabric.

  • Ensure the slotted or perforated drainage pipe drains freely to a safe collection point. If gravity drainage is to be used ensure that the drainage terminates below the level of the internal slab so that drainage surcharge cannot prevent the

  • removal of water from the system. If gravity drainage is not available, discharge the drainage pipe to a sump system - a full range is available with chambers of 1.2m to 4.5m depth.

  • Carefully place the filter fabric to the face of the WPA Drainage Cell so that it is held in place by the back fill.

  • Use Bayset Pressure Seal to the top edge of the membrane to prevent debris and back-fill from entering the cavity between the drainage core and the filter fabric.

  • Carefully backfill the excavation. If graded stone is used, a protection board is not required but the stone should be placed in controlled layers of no more than 600mm to prevent slump to the membrane. If the removed soil is re-used, ensure that it does not contain sharp stones and ensure that the soil is compacted every 600mm. If sharp stones exist within the re-used soil a protection board will be required.


Performance Data and Physical Properties @23°C & 55% RH

  • Appearance

  • Material

  • Colour

  • Thickness

  • Vertical water flow

  • Compressive Strength

  • Life expectancy

  • Crack Bridging

  • Service Temperature



Do not use WPA Drainage Cell:

  • As a primary waterproofing membrane. Primary waterproofing of the structure should be achieved with a WPA/Bayset membrane suitable for the waterproofing of foundation walls;

  • To de-water permanently high-water levels. See BS8102-2009 for further guidance;

  • As stand-alone product if water or damp and vapour control is required by the specification.



WPA Drainage Cell is available in 2m x 20m rolls.



One roll of WPA Drainage Cell covers 40 m².


Shelf Life

Newton 408 EcoDrain should be stored away from direct

sunlight. Rolls should be stored in the upright position.



Waterproofing Products Australia warrant this product for 10 years provided the application is in accordance with our written directions for use and the relevant Australian Standards have been followed. The representations and recommendations regarding this product are based on tests which we believe to be reliable. However, no guarantee of their accuracy can be made due to the great range of field conditions and variations encountered in raw materials, manufacturing equipment and methods. Thus, this product is sold with a limited warranty only, and on the condition that purchasers will carry out their own tests to determine the suitability of the product for their particular purposes. Under no circumstances will Waterproofing Products Australia be liable to anyone except for replacement.



The information provided in this technical bulletin is as correct in detail as possible and is intended to give a fair description of the product and its capabilities. In practice, the substrate and environmental conditions vary widely, making it essential for the user to determine the products suitability for a particular application and that the product is not used beyond its physical limitations. The product is guaranteed provided it is applied in accordance with our instructions as stated in this data sheet and any relevant Standard or Code, and provided the building and installation is structurally sound. Waterproofing Products Australia terms and conditions of sale apply.



The technical information and application advice given in this Waterproofing Products Australia publication is based on the present state of our best scientific and practical knowledge. As the information contained herein is of a general nature, no assumption can be made as to a product’s suitability for a particular use or application and no warranty as to its accuracy, reliability or completeness, either expressed or implied, is given other than those required by law. The user is responsible for checking the suitability of products for their intended use.



Field service where provided does not constitute supervisory responsibility. Suggestions made by Waterproofing Products Australia either orally or in writing may be followed, modified or rejected by the owner, engineer or contractor since they, and not Waterproofing Products Australia, are responsible for carrying out procedures appropriate to a specific application.

Last updated February 2019.  


The publication of this Data Sheet invalidates all previous Product Information. Data Sheets are subject to change without notice.  Please visit regularly to view up to date information.  This is a CONTROLLED document under WPA’s Quality System.