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Ardex WPM 157         :



One part moisture cured polyurethane membrane.

Good adhesion to a wide range of substrates.

Excellent chemical resistance.

Can be applied as a single coat finish.

Ideal for planter box internals and retaining walls.  




ARDEX WPM 157 (Polyurethane Membrane) is a single component moisture cured polyurethane system for waterproofing.  


Excellent flexibility.

One component.

Good adhesion to a wide range of substrates.

Excellent chemical resistance.

Decrease in construction cost and time.

Can be applied as a single coat finish at 1mm thickness.  


Typical Application


Planter box internals and retaining walls.

Roof and Deck areas that are to be paved over with a sand bed, ballasted or otherwise covered without bonding.

Landscaped decks.  




Application by brush or roller (spray application only with adequate protective gear). Ardex WPM 157 must be applied to dry surfaces with a moisture content of less than 7%. If doubt exists regarding the moisture content of the substrate, surface should be primed with ARDEX WPM 300 (HydrEpoxy 300) and allowed to cure for a minimum of 3 days before application of the ARDEX WPM 157. ARDEX WPM 157 should be applied at the required coverage rate. In the event that this coverage rate is not achieved in one coat a second coat must be applied within a maximum of 16 hours to achieve an intercoat bond.  




Prime wet or damp surfaces and concrete less than 28 days old with ARDEX WPM 300 (HydrEpoxy 300) at a coverage rate of not more than 3.0 square metres per litre. Prime dry porous surfaces with ARDEX WPM 270 (Solvent Based Primer) at a coverage rate of approximately 6 square metres per litre.  


Application method  


It is preferred that ARDEX WPM 157 is applied over a primed surface. Apply the ARDEX WPM 157 in one application to achieve an overall dry film thickness of 1.0mm for non-trafficable surfaces. Application using a roller or brush (multiple coating in two direction application) is recommended. Subsequent coats must be applied within 16 hours of the preceding coat. During application full suitable protective clothing should be employed. If using in areas of low ventilation full external breathing apparatus should be used.  




Direct bonding of ceramic tiles or other hard coverings is not recommended. Topping screeds should be self- supporting (i.e. reinforced), should be at least 40mm thick and applied over a suitable slip sheet. ARDEX WPM 157 must be applied to completely dry surfaces. ARDEX WPM 157 should not be applied without the necessary protective clothing - refer safety data. This product is very sensitive to air, therefore containers cannot be resealed for future use once they have been opened. ARDEX WPM 157 is not UV stable and not resistant to foot traffic.  


Thinning and clean up  


Thinning of ARDEX WPM 157 is not required since this will inhibit the ability to achieve the correct dry film thickness. If thinning is required the addition of up to 10% of xylene should be used. Roller sleeves and brushes should be considered as consumables and disposed of following application. Other clean up may be done using xylene or other high aromatic hydrocarbon solvent.  


Safety Precautions  


ARDEX WPM 157 is a hazardous and non-dangerous good. Keep container in a well-ventilated place. Do not empty into drains. Appropriate protective clothing must be worn during application. In case of contact with eyes, rinse with plenty of water and contact a doctor or Poisons Information Centre. If swallowed, IMMEDIATELY contact a doctor or Poisons Information Centre (show the container or label).  


Handling and storage  


ARDEX WPM 157 can be stored for 9 months at below 25oC. Avoid prolonged exposure to humidity or temperature above 50oC. Avoid contamination with water or alcohols.


20kgs (nominal 15 litres).  





Single pack moisture curing polyurethane


Green viscous liquid


1.4 +/- 0.1 kg/L

Solid content (%)

92 +/- 2

Tack free time (hrs at 25 degree/ 60%RH)

max 3

Curing time (hrs at 25 degree/ 60%RH):


Coating thickness 1.0mm

max 24hr

Coverage rate:

approx. 13m2 at 1mm dry film thickness

Proper hardness (Shore A)


Tensile strength MPa

2 MPa

Elongation (%)


VOC content



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