Everflex Aqua-Ban Elastomeric Waterproof Membrane

Everflex Aqua-Ban is a single-component, water-based SBR Class III membrane for under-tile bathrooms, showers, balconies and decks. Its micro-fibre reinforcement and anti-microbial formulation create a flexible seamless barrier for wet-area systems that will be covered by compatible finishes.

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Best fit in the Everflex range

Choose Aqua-Ban when you want the SBR, anti-microbial under-tile option for bathrooms, showers and covered external areas. For projects specifically nominated around Everflex WPM, use Everflex WPM. For roofs, balconies or pedestal systems that will remain UV exposed, use Everflex WPUV or Everflex HVUV.

How it works

Everflex Aqua-Ban is a single-component, water-based styrene-butadiene rubber (SBR) membrane. It is self-reinforced with micro-fibres to build tensile strength across joints and transitions without requiring full-sheet reinforcing canvas in standard installations. Once cured, the membrane achieves Class III elongation (391% under AS 4858), accommodating structural movement in timber floors and multi-storey framing without cracking or delaminating. Its low permeability (3.92g/m²/24h under ASTM E96) prevents moisture transmission through engineered timber and structural plywood substrates, protecting underlying framing from rot.

Numbers that matter

• 391% elongation (AS 4858 Class III): High elasticity to absorb structural movement in timber floors and sheet joins without rupturing.
• 1.0mm minimum dry film thickness (DFT): The minimum thickness required for internal installations, typically achieved at a consumption rate of 1.5 litres per square metre.
• 1.3mm minimum dry film thickness (DFT): The minimum thickness specification required for all external installations, including decks and balconies.
• 48-hour final cure: The required drying window at 25°C and 50% relative humidity before tiling or screeding can begin.
• <1g/L VOC: Certified low-emitting compound meeting Green Star environmental criteria for indoor air quality.

Where to use it

Everflex Aqua-Ban is suitable for internal and external under-tile applications on both residential and commercial projects. Acceptable substrates include:

• Concrete cured for a minimum of 28 days
• Sand cement screeds or engineered screeds (such as Gripset C-Bed) cured for at least 4 days
• Masonry, brickwork, render, and Hebel aggregate blocks
• Cement sheeting, underlay, external weatherboard, and blue board
• Wet area plasterboard and Villaboard
• Timber flooring, including structural plywood Type A (PAA JAS-ANZ)
• Pre-cast concrete with all release agents fully removed or dissipated

Installation limits

• Temperature boundaries: Do not apply when substrate or ambient temperatures are below 10°C or above 35°C.
• Hydrostatic limits: Not suitable for areas subject to negative hydrostatic pressure, rising damp, or continuous rising moisture.
• UV exposure: Everflex Aqua-Ban has limited UV resistance. It is not designed as an exposed trafficable membrane and must be tiled, paved, or covered with a protective top coat.
• Substrate condition: Do not apply over damp, wet, or contaminated substrates, or if rain is imminent.
• Foot traffic: Avoid foot traffic on the uncured membrane to prevent film damage.

Application and system integration

To ensure compliance with the National Construction Code (NCC) and AS-4858/AS4654.1 standards, follow these application requirements:

Preparation and Priming: All surfaces must be clean, dry, and free of laitance or release agents. Chamfer external corners to 12mm. Priming is always recommended. For internal jobs, use Everflex WBP; for external applications like balconies, use Everflex VBS moisture barrier. Apply Everflex Aqua-Ban within 24 hours of the primer becoming touch-dry.

Joints and Transitions: Apply an elastic fillet to internal corners and sheet joints using Adheseal PU or Hi-Flex MS sealant. Use a 12mm bond breaker tape for internal wet areas and a 38mm bond breaker for external joints. For dynamic expansion or control joints, integrate Adheseal Elastoproof tape.

Membrane Application: Stir thoroughly before use. Apply a minimum of two coats at right angles to each other using a brush or roller. Each coat must be applied at approximately 0.75mm wet film thickness (WFT) to ensure the system achieves the target dry film thickness. Verify your wet film thickness during application using a WFT gauge. Recoat after 2 to 4 hours once the first coat is dry to the touch, and within 24 hours.

Tile Adhesive Compatibility: Everflex Aqua-Ban is compatible with cementitious and solvent-free tile adhesives, including Gripset C-Lite, C-Mastic, C-Rubber, and RLA Unigrip and Mastic adhesives. For other adhesive brands, confirm compatibility with the manufacturer prior to tiling.