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Everflex WPUV is a polyurethane-fortified, water-based elastomeric waterproofing membrane engineered for high-exposure external environments and critical internal wet areas. This Class III membrane utilizes integrated micro-fibre reinforcement to bridge structural movement while its specific non-re-emulsifying chemistry maintains watertight integrity even under pedestal systems or areas of ponding water.
Certified to AS-4858 and AS-4654.1, it ensures strict NCC compliance for professional contractors requiring a UV-stable, rapid-drying barrier on concrete, FC sheet, and masonry substrates. To prevent adhesion failure or re-emulsification, surface preparation must include substrate moisture testing and the application of Everflex VBS primer for external balcony use.
Frequently Asked Questions
Is Everflex WPUV suitable for exposed roofs?
Yes — WPUV is UV stable and designed for fully exposed external use on rooftops, balconies, podiums, and other horizontal surfaces subject to sun, rain, and ponding water.
Can it be used under tiles?
Yes. WPUV can be used as a membrane under tiled systems in external areas. It must be fully cured and protected with suitable adhesive or topping layers. Compatible with most water-based tile adhesives.
Does it require a primer?
In most cases, no primer is required on clean, sound concrete, masonry, or FC sheet. For highly porous or dusty surfaces, a diluted first coat (as a primer) or bonding primer may be recommended.
Is it resistant to ponding water?
Yes. Everflex WPUV is designed to resist ponded water on horizontal surfaces once fully cured. Minimum fall is always recommended for drainage, but the membrane will not degrade from standing water.
What is the recoat time and full cure time?
At 23°C and 50% RH, recoat time is approx. 2–4 hours, and full cure occurs after 5–7 days depending on film thickness and weather conditions.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Exposed concrete rooftops and podium slabs | UV-stable, Class 3 flexibility, and ponding water resistance | Waterproofers, Builders, Roofing Contractors |
| Balconies and verandas with trafficable toppings | Tough elastomeric film compatible with screed and tile beds | Tilers, Membrane Applicators |
| Planter boxes and podium garden beds (with drainage) | Resists microbial growth, root moisture, and standing water | Landscapers, Waterproofers |
| Retaining walls (protected) | Low VOC and non-flammable – safe for below-ground installations with board protection | Structural Contractors, Landscapers |
| FC sheet façades and blockwork walls | Forms a paintable barrier against weather and surface moisture ingress | Facade Applicators, Builders |
How to Apply Everflex WPUV
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1. Prepare the Surface
All surfaces must be clean, dry, and structurally sound. Remove dust, oil, laitance, curing agents, and other contaminants. Light grinding or acid etching may be required on smooth concrete. -
2. Prime (if required)
On porous or absorbent substrates, use a diluted first coat of WPUV (1 part WPUV : 1 part water) as a primer. Allow to dry before applying full-strength membrane. -
3. Apply First Coat
Apply the first full coat using a roller, brush, or airless spray. Aim for an even, continuous film without pinholes. Allow to dry for 2–4 hours (at 23°C) before recoating. -
4. Apply Second Coat
Apply the second coat perpendicular to the first to ensure complete coverage and build-up of membrane thickness. Total dry film thickness should reach 1.0–1.5mm depending on exposure and specification. -
5. Cure and Protect
Allow membrane to cure for 5–7 days before permanent water exposure. Protect from foot traffic, rain, or UV topcoats during initial cure. Always refer to project-specific specifications for protection layers (tiles, screed, etc.).
Limitations & Safety
Product Limitations
- Do not apply to wet or saturated surfaces – substrate must be visibly dry and stable
- Not suitable for negative pressure waterproofing (e.g. rising damp, below-grade hydrostatic pressure)
- Not recommended for direct use over metal or plastic surfaces
- Must be topcoated if exposed to prolonged UV – though UV stable, protective coating enhances longevity
- Not trafficable without additional topping system – not designed as a wear surface
Safe Handling & PPE
- Wear gloves and eye protection during application
- Ensure adequate ventilation in enclosed areas
- Avoid contact with eyes or prolonged skin exposure
- Store sealed containers below 30°C; protect from freezing
- Refer to SDS for full safety, first aid, and disposal instructions
Adhesion & Surface Compatibility
✅ Excellent Adhesion – No Primer Required
- Concrete (cured, clean, and sound)
- Masonry block and render
- Fibre cement sheet (FC sheet)
- Cement screed or topping slabs
- Compressed sheet sheathing
Everflex WPUV adheres directly to most clean, dry porous substrates without priming. Surfaces must be structurally sound, free from laitance, dust, oil, or release agents.
⚠️ Surface Testing Recommended
- FC sheet with pre-sealers or coatings
- Old membranes or coatings (acrylic, bitumen)
- Painted or sealed concrete
- Timber sheathing (only if approved and sealed)
On non-porous or coated surfaces, adhesion should be confirmed by site testing or using a diluted first coat as a primer.
❌ Not Suitable
- Plastic and PVC surfaces
- Metal substrates (zinc, aluminium, steel)
- Wet or ponded substrates
- Bituminous membranes or tar-based systems
WPUV is not formulated for adhesion to metal, plastic, or oily substrates. Do not apply to surfaces with active leaks or standing water.
Downloads & technical resources
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