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Ardex WPM 908 :

ARDEX WPM 908 - Water Based Acrylic Trafficable Membrane  


Abrasion resistant - excellent slip resistance properties

Single component - ready to use, no mixing required

UV resistant - suitable for exposed applications

Water based - safe to use, low odour

Green Star - meets the benchmark for VOC credit in the Green Building Council of Australia's Rating Tools  




ARDEX WPM 908 is a water based single part acrylic trafficable waterproof membrane. It has specifically been developed for use as a hard wearing trafficable membrane on various substrates. ARDEX WPM 908 has been formulated to give anti-slip properties without the use of additional broadcast sand or fillers.  




Waterbased - safe to use, low odour

Abrasion resistant- excellent slip resistance properties

Single component- ready to use, no mixing required

UV resistant - suitable for exposed applications

Green Star - meets the benchmark for VOC credit in the Green Building Council of Australia's Rating Tools  


Range of Applications  


Pedestrian traffic podiums



Roof decks

Plant and mechanical room floors

Swimming pool surrounds

Trafficable box gutters





Surface Preparation  


Concrete - the preferred surface texture for concrete floors in preparation for the application of ARDEX products is a wood float finish. Steel trowel finished concrete must be roughened mechanically as necessary to remove laitance and provide a good key for product application. All surfaces must be dry and cleaned free from dirt, grease, oil, curing compounds, loose particulates and other surface contaminants.  

Existing membranes or coatings on concrete - all existing membranes, adhesives and other surface coatings shall be removed by mechanical means and the surface treated to open the pores. All surfaces shall then be cleaned free from all loosely bound materials and all other surface contaminants and allowed to dry thoroughly.  

Compressed Fibre Cement sheets must be fixed strictly in accordance with the manufacturer's instructions. Mechanical fixings such as screws shall be countersunk, filled and sanded to a smooth substrate surface finish. All surfaces shall then be sanded to a smooth to plane finish and vacuumed to remove all loose particles. All surfaces should be dry, clean, and free of dust, grease and all loose contaminating materials. Joints between sheets and perimeter joints should be sealed with a neutral cure silicone and a 30mm bondbreaker tape (PVC duct tape or masking tape) shall be installed equidistantly across each joint.  





Cured for minimum 28 days, wet concrete should be allowed to dry thoroughly or sealed with one coat of ARDEX WPM 300 at coverage rate of 3.0m2 per litre.  

Renders and screeds  

Cured for min 7 days. Wet render should be allowed to dry thoroughly or sealed with one coat of WPM 300 at coverage rate of 3.0m2 per litre and allowed to cure overnight.  

Compressed fibre cement sheets  

Wet area grades only.  




Prepared substrates must be primed with ARDEX WPM 300 (HydrEpoxy) prior to the application of ARDEX WPM 908 Trafficable Membrane.  


Typical Applications


External decks and floors, rooftops (new and existing), podiums, parapets.

External timber decks should be waterproofed with ARDEX Butynol membrane.  


Apply ARDEX WPM 908 with a brush or paint roller. Stir ARDEX WPM 908 thoroughly prior to each application. Apply at a wet film thickness rate of 400μm per coat (three coat system) to ensure full coverage with brush or roller. Apply ARDEX WPM 908 at a minimum of three coats ensuring a uniform coverage is achieved at an approximate wet film thickness of 0.4mm per coat to achieve an overall dry film thickness of 0.6mm. Anti slip properties may be enhanced on application by using a textured roller. ARDEX WPM 908 has been formulated to provide anti-slip properties. For superior anti slip properties, use of alumina grit is recommended. This should be broadcast over the first coat of ARDEX WPM 300 prior to application of ARDEX WPM 908 Trafficable Membrane.  


Coverage Guide

1) Prime Coat        ARDEX WPM 300    (WFT)        0.3mm

2) First Coat         ARDEX WPM 908    (WFT)        0.4mm

3) Second Coat     ARDEX WPM 908    (WFT)        0.4mm

4) Third Coat        ARDEX WPM 908    (WFT)        0.4mm


Approximately 12.5 m2 per pail (three coat system).  


Drying Time  

Recoat time is 2 - 4 hours in between first and second coats. Drying time on flat surfaces under standard conditions is around 4 hours. However, dry through time will be slowest in areas where ARDEX WPM 908 is applied over silicone bond breaker, or is reinforced. Make sure these areas are dry. In some cases, this can vary from 24 hours to 48 hours. Full cure of the product is 3 days after application at 23oC. Drying times will vary depending on humidity, surface temperature and porosity of substrates.  



15L (17.3kg) pail, 12 months when stored in the original unopened packaging in a dry place at 23oC.  

Clean up and Disposal  

Wash hands, brushes, rollers, etc, with water while the membrane is still fresh. Remove cured material with mineral turpentine. Remove any food or drink stains immediately with warm water and a mild household detergent. Dispose of containers in compliance with all relevant local, state, and federal regulations.  



All surfaces must be structurally sound, dry and free from all surface contaminants.  


Areas subject to negative hydrostatic pressure or rising damp.

Wet substrates or green screeds/concrete - need to be sealed with one coat ARDEX WPM 300 as described earlier.

Surface temperatures below 10oC or greater than 35oC  


Technical Data  


ARDEX WPM 908 meets the criteria for AS 4654.2 - 2009

Above Ground Level - Materials

Above Ground Level - Design and Installation  



Medium viscosity liquid


Grey, white base

Specific gravity


Application temperature


Surface temperature

10 - 30oC

Service temperature

0 - 80oC

Elongation at break


Abrasion resistance mean wear index (ASTM D 4060-07)

61.5 (H22 wheel)

Accelerated wear slip test ARDEX WPM 908

Class W Wet pendulum test (as made)

Accelerated wear slip test ARDEX WPM 908  (with Aluminium Oxide Grit No.16)

Class V Wet pendulum test (after 5000 wear cycle)

Dry floor friction test

Class F

VOC content



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