ACTFLEX 989 CWP Cementitious Membrane
- Regular price
- $210.00 AUD
- Sale price
- $210.00 AUD
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ACTFLEX 989 CWP is a two-part flexible cementitious waterproofing membrane designed for internal and external wet areas where hydrostatic tolerance and movement accommodation are required. Ideal for bathrooms, balconies, podiums, swimming pools, planter boxes and below-grade retaining walls, it forms a seamless anti-efflorescence barrier suitable for tiling and screeding.
Designed to meet AS 4858 and AS 4654.1 as a Class III membrane, it provides up to 250kPa hydrostatic resistance when applied directly to the substrate. Minimum two-coat system for wet areas, with three coats required for underground or constant water contact applications. Not suitable as a permanently exposed UV or trafficable finish.
- Class III membrane to AS4858
- Two-component cementitious acrylic system
- Hydrostatic resistance up to 250 kPa
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Overview & Features
- Fast drying tiling in 6–8 hours
- Suitable for damp cured substrates
- Compatible with most tile adhesives
- Low VOC water clean-up formulation
- Strong cured flexible finish
Application Guide
- Mix liquid and powder at a 1:1.2 ratio until homogeneous
- Apply a minimum of two coats for wet-area applications
- Apply three coats for underground or constant water-contact applications
- Achieve a minimum 1.2mm dry film thickness in wet areas
- Achieve a minimum 1.5mm dry film thickness underground or in immersion areas
- Allow 4–6 hours between coats at 25°C
- Allow 6–8 hours before tiling or foot traffic
- Allow 72 hours for full cure at 25°C
Specifications & Standards
- Membrane classification Class III
- Hydrostatic resistance 250kPa
- Elongation at break approx 389 percent
- Tensile strength 2.31MPa
- Mixing ratio 1:1.2 liquid to powder
- Minimum DFT 1.2mm wet areas
- 1.5mm DFT underground or immersion
- 18kg kit covers approx 8m² at 1.2mm
- Recoat 4–6 hours at 25°C
- Foot trafficable 6–8 hours
- Full cure 72 hours at 25°C

