Membranes > WPA 100 >  WPA 100 - Technical Data Sheet

WPA 100 - Technical Data Sheet

Product Description

WPA 100 is a single component, fibre reinforced, rapid drying, cementitious waterproofing membrane. It is based on special cements, modified with polymers and selected graded aggregates and special waterproofing additives to produce a flexible waterproofing compound.


WPA 100 is suitable for both positive and negative side waterproofing applications and is capable of withstanding significant strain.


WPM 100 has excellent adhesion to concrete, cement render and most F/C sheets and may be used in conjunction with WPA Elastoband for maximum performance and ease of use.


Recommended for:

  • Swimming Pools

  • Planter Boxes

  • Retaining Walls

  • Balconies

  • Rooftops

  • Lift Pits

  • Tanks



  • Class I membrane in accordance with AS 4858 & AS 4654.1;

  • Fast curing;

  • Suitable for both positive and negative hydrostatic water pressure applications;

  • Permanently flexible;

  • Completely resistant to re-emulsification;

  • Excellent adhesion to a wide variety of substrates;

  • Suitable for spray applications.





WPA 100 is suitable for concrete, render, screeds, block work and fibre-cement sheeting.


Always contact the manufacturer if there is any doubt about the suitability of substrates.



All surfaces to be waterproofed must be firm, clean, dry, sound and smooth. All laitance, grease, oil, wax, curing compounds, loose material, paint and any other contaminants which may reduce or prevent adhesion must be mechanically removed. Masonry surfaces must be pointed flush and surface defects repaired.


New concrete and render must have cured for a minimum 28 days. Sand & cement screeds and renders must have cured for a minimum 7 days.


Fibre cement sheeting and Scyon sheeting must be installed in accordance with the manufacturers’ installation requirements.


WPA 100 is suitable for use in concrete and masonry swimming pools, spas and ponds, provided they are rendered prior to the application of WPA 100 and the membrane is covered by suitable tile finishes installed with TPA Lite tile adhesive. Cementitious swimming pool finishes may also be applied to WPA 100. A bond coat may be required, refer to coating manufacturer.


Crack Treatment

WPA 100 cannot span gaps. For dynamic cracks/expansion joints and control joints, the use of the WPA Elastoband system is recommended. Contact the WPA Technical Department for further advice.



Porous substrates must be adequately dampened prior to application of WPA 100.


Dense substrates, such as metals or PVC must be primed with WPA 360 Concentrate.


Apply the primer to the prepared substrate using a brush or roller in accordance with the relevant product’s Technical Data Sheet. Allow primers to fully dry prior to commencing the application of WPA 100.



WPA 100 is mixed with water according to the intended application method. Add the appropriate amount of water into a bucket and slowly add the WPA 100 powder while slowly stirring with a mechanical mixer. Continue to stir until homogenous, lump free mixture is obtained. Do not mix by hand.


Mixing ratios may be adjusted as follows:

Roller or Spray application: 6-7l water / 20kg bag

Brush application: 5-6l water / 20kg bag

Trowel application: 4.2 – 4.5l water / 20kg bag


Product that has been mixed and allowed to stand for longer than 2 hours, or has become very thick, should be discarded.



WPA 100 requires a suitable bond breaker/fillet at all horizontal and vertical transitions. For optimal performance incorporate WPA Elastoband at all transitions. WPA 100 must be applied in accordance with AS3740 and AS 4654.2, as applicable.


Using a brush, roller or spray equipment, apply the first coat of WPA 100 after the substrate has been properly prepared. Apply an even and consistent coat of a minimum 1mm and a maximum 2mm wet film thickness.


Once the first coat has dried, apply a second of WPA 100 at right angles to the first coat. Apply an even and consistent coat of minimum 1mm and a maximum 2mm wet film thickness. Allow the final coat to cure for 48 hours prior to installing tiles. Allow the membrane to cure for 4 days in swimming pools and 14 days in water tanks.


On retaining walls and in all planter box application, allow the final coat to cure for 48 hours prior to installation of WPA Drainage Cell and backfilling. WPA Drainage Cell must be installed to the entire waterproofed area, once the membrane has fully cured.


The final dry film thickness for applications subject to positive hydrostatic pressure must be no less than 2.0mm and 3.0 mm for applications subject to negative hydrostatic pressure.


Note: Avoid contact with skin and eyes. Wear splash proof goggles and rubber or PVC gloves at all times.


Performance Data and Physical Properties @22°C & 50% RH


Do not apply WPA 100:

  • Over wet (standing water) or contaminated substrates;

  • If it is raining or if rain is imminent;

  • Directly over any existing coatings;

  • As a high wear surface for foot or vehicle traffic;

  • Where ambient or surface temperatures are below 10°C or greater than 35°C;


To reduce the possibility of surface contamination, it is recommended that tiling be carried out as soon as the membrane has cured.


Clean Up

Tools and minor spills can be cleaned with water while product is still wet. Cured WPA 100 can only be cleaned by mechanical means.



WPA 100 is available in 20 kg bags.



1.2 kg per m² at 1mm dry film


The coverage figures are theoretical due to wastage and depending on the porosity and profile of the substrate, coverage figures may be reduced.


Shelf Life

Unopened pails can be stored for up to 12 months in a cool, dry and weatherproof environment. If stored at high temperatures, the shelf life may be reduced.


First Aid

If poisoning occurs, contact a doctor or Poisons Information Centre (Phone Australia 131 126).



Remove victim from exposure - avoid becoming a casualty. Remove contaminated clothing and loosen remaining clothing. Allow patient to assume most comfortable position and keep warm. Keep at rest until fully recovered. Seek medical advice if effects persist.


Skin Contact

If skin or hair contact occurs, remove contaminated clothing and flush skin and hair with running water.


If swelling, redness, blistering or irritation occurs seek medical assistance.


Eye Contact

If in eyes, wash out immediately with water. In all cases of eye contamination it is a sensible precaution to seek medical advice.



Rinse mouth with water. If swallowed, do NOT induce vomiting. Give a glass of water to drink. Never give anything by the mouth to an unconscious patient. If vomiting occurs give further water. Seek medical advice.


Notes to Physician

Treat symptomatically.



Prevent from entering drains or waterways. Absorb with sand, earth or spill control material. Collect in properly labelled containers for disposal in accordance with local statuary requirements.



Waterproofing Products Australia warrant this product for 15 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. WPA P/L terms and conditions of sale apply.



The technical information and application advice given in this WPA P/L 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 WPA P/L either orally or in writing may be followed, modified or rejected by the owner, engineer or contractor since they, and not WPA P/L, are responsible for carrying out procedures appropriate to a specific application.






Last updated March 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.