For under-tile wet areas, balconies, and decks requiring a compliant moisture barrier, Everflex WPM Elastomeric Waterproof Membrane provides a seamless, Class III high-elasticity seal. It is formulated specifically for under-tile installations and is tested to AS-4858:2004 and AS4654.1 to ensure compliance with the National Construction Code (NCC) for both internal and external applications.
Everflex WPM Elastomeric Waterproof Membrane is a single-component, water-based liquid membrane reinforced with microfibres. It cures to form a fully bonded, seamless barrier that resists water immersion without re-emulsifying. It has a Class III elongation rating of 391% under AS 4858, which provides the high elasticity needed to accommodate structural movement on timber floors and joint connections without cracking. The formulation is low-permeability, non-toxic, contains less than 1g/L VOCs to meet Green Star environmental criteria, and actively inhibits mould and biological growth.
Suitable for internal and external under-tile applications over the following substrates:
All substrates must be dry, clean, and free of dust, oils, grease, curing compounds, or release agents. Non-structural cracks, holes, and deformities must be rectified before application.
The use of a primer is always recommended. Use Everflex WBP for internal areas. For external roof decks and balconies, use Everflex VBS. Apply the primer, and once touch-dry, apply the membrane within 2 to 24 hours.
Mix Everflex WPM thoroughly before use. Apply in a minimum of two coats using a brush or roller. Apply the first coat at approximately 0.75mm wet film thickness (WFT). Once dry, apply the second coat at a right angle to the first at 0.75mm WFT. Verify the thickness during application with a wet film thickness gauge. For internal areas, a minimum of two coats must achieve a 1mm dry film thickness (DFT), typically requiring 1.5 litres per square metre. For external applications, a minimum of two coats must achieve a 1.3mm DFT. Recoat window is 2 to 4 hours after touch-dry and within 24 hours at 25°C and 50% humidity.
Yes, Everflex WPM is certified for external under-tile applications like balconies. It forms a durable, seamless barrier when correctly installed and tiled over to prevent UV exposure.
No, Everflex WPM has limited UV resistance and must be tiled or topped. It is not designed for long-term direct sunlight exposure as an exposed membrane.
Yes, it is tested to NCC, AS-4858:2004 (Class III), and AS4654.1:2012 standards. This confirms compliance for both internal and external under-tile applications.
A primer is always recommended for adhesion, particularly on porous and warm surfaces. Use Everflex WBP for internal applications or Everflex VBS for external areas like roof decks and balconies. Always refer to the primer's TDS for specific application instructions.
| Application | Key benefit | Primary trades |
|---|---|---|
| Shower recesses & internal wet areas | Certified to AS4858 Class III (391% elongation), forming a seamless, flexible barrier that does not re-emulsify. | Tilers, Waterproofers, Builders |
| External balconies & patios (under tile) | Complies with AS4654.1 for external under-tile use, providing reliable protection against water ingress. | Waterproofers, Builders |
| Waterproofing over timber floors | Low permeability protects structural timber from moisture, while Class III flexibility accommodates substrate movement. | Tilers, Waterproofers |
| Commercial kitchens & laundries (under tile) | Inhibits mould, low VOC (<1g/L) supports Green Star criteria, durable against water exposure for demanding environments. | Builders, Waterproofers |
| Under-tile application requiring fast turnaround | Rapid drying time (48 hours before tiling at 25°C/50% humidity) allows for quicker project completion. | Tilers, Builders |
Application
Surface preparation:
All surfaces must be structurally sound, stable, dry, clean, and free of dust, loose, flaking, friable material and free from oils, grease, form release agents, curing compounds, and any other surface contamination that may hinder adhesion. Ensure that surfaces are free of protrusions to achieve a continuous, even film build. Removal of sharp edges and ridges, chamfer external corners 12mm. Non-structural cracks, holes, and deformities are to be rectified. Substrate must be free from surface water and continual dampness. Concrete must be allowed to cure for at least 28 days.
Screed and render:
A 3:1 ratio sand and cement screed, or Gripset C-Bed engineered screed is recommended if falls need to be created prior to membrane application. Sand cement screeds and cement render must be allowed to cure for at least 4 days prior to the application of primers. Failure to do so may result in poor adhesion and subsequent delamination.
Priming:
The use of a primer is always recommended, particularly on porous and warm surfaces. For internal applications, Everflex WBP is typically sufficient, while for external applications like Roof Terraces and Balconies, Everflex VBS is advised. Refer to the primer Technical Data Sheet (TDS) to ensure you have the appropriate primer for your application and apply it in accordance with the primer’s TDS. Once the primer is touch-dry, apply Everflex WPM within 24 hours; times vary depending on atmospheric conditions. Metal surfaces: a metal etch with either VBS or OP primer. For other non-porous surfaces, OP primer is normally sufficient.
Everflex WPM Installation:
Please note that installation of the WPM waterproof system must be strictly in accordance with the requirements as detailed in the National Construction Code.
Before use, mix Everflex WPM thoroughly. Using a brush and or roller, apply the first coat of product to achieve an even and consistent coat of approximately 0.75mm wet film thickness. Once the first coat has dried, apply a second coat at a right angle to the first coat at 0.75mm wet film thickness. Verify wet film thickness with a film thickness gauge. Everflex WPM must be applied with a minimum of two coats, achieving a minimum dry film thickness (DFT) of 1mm. The average recoat time is 2-4 hours after being dry to the touch, and within 24 hours, at 25˚C and 50% humidity. These times vary depending on atmospheric conditions. If more than 2 coats are required to achieve the minimum DFT, apply additional coats at right angles to the previous until the correct DFT is achieved.
Waste Outlets, Penetrations and Angles
Waste Outlets:
Floor wastes and puddle flanges should be rebated into the floor to allow water to readily drain. Fill all gaps and perimeters with Adheseal PU or Hi-Flex MS sealant.
Waterstops:
Where required by the NCC, including door barriers, balcony edge trims or shower waterstops, they should be sealed and secured with Adheseal PU or Hi-Flex MS sealant.
Gaps, Joints and Transitions:
Apply a fillet forming a cove, with Adheseal PU, Hi-Flex MS sealant or suitable bond breaker to internal corners and over sheet joints, bond breaker to be 12mm for wet areas, 38mm for external above-ground gaps, joints and internal corners. For additional protection, apply polyester reinforcing fabric to the corners and joints saturated into the first coat of membrane. For dynamic cracks/expansion joints and control joints, the use of Adheseal Elastoproof is recommended. For any further guidance, please contact the Adheseal Technical Department.
Wear overalls, safety shoes, safety glasses, and impervious gloves. Nitrile rubber gloves are suggested for intermittent contact.
Use only in well-ventilated areas. Natural ventilation is adequate under normal conditions. Keep containers closed when not in use.
Store in a cool, dry, well-ventilated place out of direct sunlight, between +10°C and +35°C. Keep containers closed. Shelf life is a minimum of 12 months from the date of manufacture. Dispose of according to State/Territory Land Waste Management Authority regulations.
Proper surface preparation is crucial for Everflex WPM adhesion and long-term performance. All surfaces must be structurally sound, dry, and free of contaminants.
Surface prep: Ensure concrete has cured for at least 28 days. The surface must be clean, dry, free from form release agents, curing compounds, and any other surface contamination. Rectify non-structural cracks and deformities.
Primer: Recommended. For internal use, Everflex WBP is typically suitable. For external applications, Everflex VBS is recommended. Apply according to the primer's TDS.
Surface prep: Sand cement screeds should be a 3:1 ratio. Render must cure for at least 4 days. Surfaces must be dry, stable, and free of dust or friable material.
Primer: Recommended. For internal use, Everflex WBP is typically suitable. For external applications, Everflex VBS is recommended. Apply according to the primer's TDS.
Surface prep: Ensure the timber flooring is structurally sound, stable, and dry. All surfaces must be clean and free of oils, grease, or other adhesion-hindering contaminants. Rectify any defects.
Primer: Recommended. For internal use, Everflex WBP is typically suitable. For external applications, Everflex VBS is recommended. Apply according to the primer's TDS.
Surface prep: Ensure boards are securely fastened and structurally sound. Surfaces must be clean, dry, and free from dust or other contaminants that could hinder adhesion.
Primer: Recommended. Everflex WBP is typically suitable for internal applications. Apply according to the primer's TDS.
| Property | Value |
|---|---|
| Type Of Product | Elastomeric Waterproof Membrane |
| Density | 1.3 g/cm3 |
| Consistency | Thick Liquid |
| Tested In Accordance With To AS | AS4858:2004, AS4654.1:2012 |
| Elongation AS 4858 | Class III, 391% |
| VOC | <1gm/lt (Greenstar Compliant) |
| Water Absorption AS 3558.1 | 0.75% |
| Resistance To Cracking AS 3848 | Pass: No fatigue cracking exhibited |
| Durability | Pass all (Deionised water, Bleach, Detergent & Heat Aged) |
| Clean Up | Water while wet |
| Storage | Between +10oc & +35oc (Cool Dry) |
| Application Temperature | Between +10oc & +35oc |
| Service Temperature | Between - 40oc & +80oc |
| Consumption | 1.5 lt/mt2 (Internal) |
| Recoat Time @ 25C | 2-4 Hours after touch-dry & within 24 hours |
| Final Drying Time @ 25C & 50% Humidity | 48 hours |
| Shelf Life | Minimum 12 month from DOM |
| Colours | Grey, Blue |
| Elongation AS4654.1:2012 | Class II |
| Permeability ASTM E96 | 3.92g/m2/24h |
Here are some common examples on where Everflex WPM Elastomeric Waterproof Membrane used by our customers.
