For external roof decks, balconies, and internal wet areas complying with AS-4858:2004 and AS4654.1:2012, Everflex HVUV Elastomeric Waterproof Membrane is a single-component, micro-fibre reinforced membrane formulated for exposed UV applications. It cures to form a seamless, fully bonded barrier that resists biological growth and does not re-emulsify when subjected to continuous water immersion.
Everflex HVUV uses a single-pack, water-based acrylic-styrene and polyurethane co-polymer chemistry reinforced with micro-fibres to achieve Class III high permanent flexibility. This high elasticity allows the cured membrane to accommodate structural movement without cracking. The formulation is self-reinforced, meaning it can span standard transitions without fabric reinforcement, though WPUV cannot span open gaps and requires a neutral-cure sealant fillet or joint band over active joints. Once cured, it is stable under continuous exposure to UV light and weathering, and it can withstand maintenance foot traffic without an additional protective screed.
Suitable for installation over the following prepared substrates:
Common applications include exposed roofs, pedestal system sub-floors, shower recesses, laundries, toilets, kitchens, patios, terraces, decks, balconies, and under-tile installations.
All surfaces must be clean, dry, and free from protrusions, release agents, curing compounds, or dust. Non-structural cracks and holes must be filled prior to application. Apply a fillet of Adheseal Hi-Flex MS sealant to all internal corners and sheet joints. Floor wastes and puddle flanges must be rebated into the floor and sealed with Hi-Flex MS sealant.
For internal priming, use Everflex WBP. For external balconies and roof decks, prime with Everflex VBS. Apply the membrane within 2 to 24 hours of the primer becoming touch-dry.
Mix Everflex HVUV thoroughly before application. Apply the first coat with a brush or roller 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 wet film thickness during application using a WFT gauge to ensure the target dry film thickness (1.0mm internal / 1.3mm external) is achieved. For additional UV and mechanical protection, the membrane can be coated with LS slip-resistant UV protective coating.
Yes, Everflex WPUV is specifically formulated for UV exposed applications. It is tested to AS4654.1 and AS4858 standards, making it suitable for exposed roofs, decks, and balconies, and will not re-emulsify.
A minimum dry film thickness (DFT) of 1mm is required for internal areas. For external applications, a minimum DFT of 1.3mm is necessary to ensure adequate waterproofing performance.
No, do not apply Everflex WPUV on damp, wet, or contaminated substrates. The substrate must be free from surface water and continual dampness to ensure proper adhesion and long-term performance.
Priming is always recommended, especially on porous or warm surfaces. For internal applications, Everflex WBP is typically used, while Everflex VBS is recommended for external areas like roof decks and balconies.
| Application | Key benefit | Primary trades |
|---|---|---|
| Exposed roofs and under pedestal systems | UV stability and Class 3 flexibility for long-term outdoor performance, resists re-emulsification | Waterproofers, Roofers, Builders |
| Balconies, patios, decks, and terraces | Compliant to AS4654.1 for external exposed areas, withstands maintenance foot traffic, tile-friendly | Tilers, Waterproofers, Builders |
| Internal wet areas like showers, laundries, toilets, kitchens | AS4858 compliant Class 3 membrane, rapid drying for earlier tiling, low VOC for Green Star projects | Tilers, Waterproofers, Plumbers |
| Waterproofing various building materials (concrete, timber, cement sheet) | High permanent flexibility and strong adhesion across common building substrates, forms a seamless barrier | Builders, Waterproofers, Renovators |
Ensure all surfaces are structurally sound, dry, clean, and free from oils, form release agents, laitance, and any contaminants. Fill holes and non-structural cracks with Hi-Flex MS or suitable filler.
Allow concrete to cure for 28 days minimum. Screeds must cure for at least 4 days. Surface must be dust-free and level.
Timber and sheeting must be securely fixed with no movement. Joints should be sealed and internal corners filleted with Hi-Flex MS.
Select the correct primer based on the substrate type and environmental exposure. Apply using brush or roller.
Recommended for internal applications and timber surfaces. Allow to dry until touch-dry before applying membrane.
Required for external areas like balconies, roof decks, and pedestal systems. Provides superior bond and vapour barrier.
Mix Everflex HVUV thoroughly before use. Apply with brush or roller in two coats — each perpendicular to the last — to achieve the correct film build.
Apply at 0.75mm wet film thickness. Use a wet film gauge to verify. Allow to dry before recoating.
Apply at right angles to first coat, also at 0.75mm wet film. Ensure minimum dry film thickness of 1.3mm is achieved for external use.
Seal penetrations, puddle flanges, and terminations with Hi-Flex MS. For enhanced protection, especially in exposed areas, apply an optional UV slip-resistant topcoat (e.g., LS UV Coat).
Use Hi-Flex MS sealant and install fillet beads where required. Ensure all outlets are recessed and membrane-lapped correctly.
Apply LS UV Slip Coat for long-term durability and added resistance to wear from maintenance traffic or harsh weather.
Causes mild skin irritation. Causes eye irritation.
Wear gloves (Nitrile Rubber is suggested for intermittent contact), apron, safety glasses, and a respirator. If an inhalation risk exists, wear an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 requirements.
Ensure adequate ventilation to maintain air concentrations below exposure standards. Use in well-ventilated areas with local exhaust ventilation.
Store in a cool, dry, well-ventilated place, out of direct sunlight, between +10°C and +35°C. Keep containers upright and closed. Minimum shelf life is 12 months from date of manufacture. Dispose of material and containers in accordance with local regulations.
Proper surface preparation and priming are critical for the long-term adhesion and performance of any waterproofing membrane. This guide outlines requirements for common substrates.
Surface prep: Concrete must be structurally sound, dry, and clean. Allow a minimum 28-day curing period. Ensure surfaces are free from dust, loose material, oils, grease, form release agents, curing compounds, and any protrusions.
Primer: Recommended. Use Everflex WBP for internal areas or Everflex VBS for external applications. Apply once touch-dry and within 2-24 hours.
Surface prep: Screeds must be a 3:1 ratio and structurally sound, dry, and clean. Ensure surfaces are free from dust, loose material, oils, grease, and any protrusions.
Primer: Recommended. Use Everflex WBP for internal areas or Everflex VBS for external applications. Apply once touch-dry and within 2-24 hours.
Surface prep: Masonry and render must be structurally sound, dry, and clean. Allow a minimum 4-day curing period for render. Ensure surfaces are free from dust, loose material, oils, grease, and any protrusions.
Primer: Recommended. Use Everflex WBP for internal areas or Everflex VBS for external applications. Apply once touch-dry and within 2-24 hours.
Surface prep: Substrates must be structurally sound, dry, and clean. Ensure surfaces are free from dust, loose material, and any protrusions. Rectify non-structural cracks or deformities.
Primer: Recommended. Use Everflex WBP for internal areas or Everflex VBS for external applications. Apply once touch-dry and within 2-24 hours.
| Property | Value |
|---|---|
| Type Of Product | Elastomeric Waterproof Membrane |
| Density | 1.24 g/cm³ |
| Consistency | Thick Liquid |
| Class | Class III Elastomeric liquid applied membrane |
| VOC | <2 g/L (Greenstar Compliant) |
| Clean Up | Water while wet |
| Storage Temperature Range | +10°C to +35°C |
| Application Temperature Range | +10°C to +35°C |
| Service Temperature Range | -40°C to +80°C |
| Coverage Internal (1mm DFT) | 1.5 L/m² |
| Minimum Dry Film Thickness Internal | 1mm |
| Minimum Dry Film Thickness External | 1.3mm |
| Recoat Time At 25°C | 2-4 hours after touch dry |
| Final Drying Time At 25°C | 48 hours |
| Shelf Life | Minimum 12 months from DOM |
| Colours | Light Grey |
| Test Certificates | AS4858:2004, AS4654.1:2012 |
| Permeability | 2.2 g/m²/24h |
| pH | 8-9 |
Here are some common examples on where Everflex HVUV Elastomeric Waterproof Membrane used by our customers.
