ACTFLEX 988 CWP 2 Part Cementitious Membrane

Sale price$214.00
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ACTFLEX 988 CWP is a top-tier waterproofing system designed for various applications, including internal and external wet areas such as bathrooms, balconies, podiums, courtyards, rooftops, and under pedestal systems. This two-part flexible cementitious modified acrylic polymer membrane serves multiple functions: it acts as an under-tile anti-efflorescence layer, provides a barrier for positive and negative hydrostatic pressure in above-ground water tanks, offers waterproofing for below-grade retaining walls, protects PVC panels, prevents rising damp, and shields cement screed areas. Compliant with AS4858 and AS4654.2:2012, it is classified as a Class 11 waterproofing membrane.

High-pressure waterproofing up to 350 kPa resistance High-pressure waterproofing up to 350 kPa resistance
Flexible cementitious formula with 217% elongation Flexible cementitious formula with 217% elongation
Suitable for positive and negative side applications Suitable for positive and negative side applications

Size: 20KG
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ACTFLEX 988 CWP CEMENTICIOUS WATERPROOFING

ACTFLEX 988 CWP 2 Part Cementitious Membrane

20KG

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517
$214.00
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High performance negative pressure waterproofing for below ground structures.

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Tank Waterproofing System

Potable water safe. Ideal for concrete water tanks and reservoirs.

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System Build-Up Guide

Correct application makes all the difference.

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Pool System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX HYDROPLUG
  • 5 ACTFLEX AT MESH
  • 6 ACTFLEX 988 CWP (2 Coats)
  • 7 Tile Adhesive
  • 8 Pool Finish
Pool System Build-Up

Retaining Wall System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX MS PRO
  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 CWP (2 Coats)
  • 6 Protection Board (Optional)
  • 7 Drainage System
  • 8 Backfill
Retaining Wall System Build-Up

Tank System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 WMP (2 Coats)
  • 6 Protective Coating (Optional)
  • 7 Water
Tank System Build-Up

Technical overview

ACTFLEX 988 CWP is a high-performance Class II two-part flexible cementitious acrylic polymer waterproofing membrane designed for internal and external wet areas, below-ground waterproofing, water-retaining structures and façade protection. Hydrostatic pressure resistant and compliant with AS4858-2004 and AS4654.1:2012.
Membrane Classification Class II (AS4654.1 / AS4858)
Chemical Base Cementitious polymer composite
Colour Khaki Green
Solid Contents 65% ± 2%
Density ~1.65 g/cm³ mixed
Elongation at Break 217% ± 5%
Tear Propagation Resistance High (Shore A 50A)
Compressive Strength 10 MPa (typical cementitious performance)
Hydrostatic Pressure Resistance up to 350 kPa (3.5 bar)
Chemical Resistance Excellent resistance to efflorescence, mild acids, and alkalis
Cure Mechanism Hydraulic cementitious reaction and acrylic coalescence
Tack Free Time 6 hours @ 25°C, 50% RH
Recoat Time 4–6 hours @ 25°C, 50% RH
Full Cure 48 hours (1.2 mm DFT), 7–10 days for water immersion
Waterproof Time 48 hours @ 25°C, 50% RH (non-submerged)
Pot Life Approx. 2 hours @ 23°C, 50% RH
Application Temperature 10°C–26°C
Recommended Thickness 1.2 mm (wet areas, PVC), 1.5 mm (underground / submersion)
Coverage 20 kg kit ≈ 8–10 m² @ 1.2 mm DFT (two coats)
Shelf Life 12 months (unopened, stored between 10–22°C, 50% RH)

Key applications

  • Internal & external wet areas
  • Below-ground waterproofing & basements
  • Water tanks & retaining walls (incl. PVC walls)
  • Swimming pools
  • Façade protection
  • Efflorescence control
  • Hydrostatic pressure applications

Surface suitability

  • Concrete (cured 7+ days)
  • Cement screed (smooth wood-trowel finish)
  • Rendered surfaces (min 7 days cure)
  • PVC panels & walls (sanded)
  • CFC sheeting
  • Plasterboard (with primer)

Not designed as a stand-alone UV-exposed or permanent trafficable membrane. Do not apply below 10°C or above 35°C.

Calculate your coverage

You will need:

ACTFLEX 988 CWP 2 Part Cementitious Membrane

ACTFLEX 988 CWP 2 Part Cementitious Membrane

20kg Kit

0 Kits

Total coverage: 0

This is an estimate only. Add 10% for wastage.

Technical Specifications

Membrane ClassificationClass II (AS4654.1 / AS4858)
Chemical BaseCementitious polymer composite
ColourKhaki Green
Solid Contents65% ± 2%
Density~1.65 g/cm³ mixed
Elongation at Break217% ± 5%
Tear Propagation ResistanceHigh (Shore A 50A)
Compressive Strength10 MPa (typical cementitious performance)
Hydrostatic Pressure Resistanceup to 350 kPa (3.5 bar)
Chemical ResistanceExcellent resistance to efflorescence, mild acids, and alkalis
Cure MechanismHydraulic cementitious reaction and acrylic coalescence
Tack Free Time6 hours @ 25°C, 50% RH
Recoat Time4–6 hours @ 25°C, 50% RH
Full Cure48 hours (1.2 mm DFT), 7–10 days for water immersion
Waterproof Time48 hours @ 25°C, 50% RH (non-submerged)
Pot LifeApprox. 2 hours @ 23°C, 50% RH
Application Temperature10°C–26°C
Recommended Thickness1.2 mm (wet areas, PVC), 1.5 mm (underground / submersion)
Coverage20 kg kit ≈ 8–10 m² @ 1.2 mm DFT (two coats)
Shelf Life12 months (unopened, stored between 10–22°C, 50% RH)

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How to install

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Step-by-step from prep to top coat. Filmed on the tools, not in a studio.

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Frequently asked questions

View all FAQs
  • What is ACTFLEX 988 CWP used for?
    Compatibility

    988 CWP is a 2-part cementitious membrane for below-ground tanking, retaining walls, swimming pools, water tanks, and wet areas. Handles both positive and negative hydrostatic pressure - ideal where water sits against the membrane.

  • What hydrostatic pressure can it resist?
    Performance

    988 CWP withstands hydrostatic pressure up to 350 kPa (3.5 bar) - equivalent to about 35 metres of water head. With 217% elongation, it bridges minor substrate movement.

  • How is it mixed and applied?
    Installation

    Two-part: blend the polymer liquid with the reactive powder per the TDS ratio. Apply two coats at 1.2mm DFT for wet areas, 1.5mm DFT for underground. 8-10 m² per 20kg kit at 1.2mm. Recoat at 4-6 hours, full cure 48 hours.

  • Standards compliance?
    Compliance

    Certified to AS4858-2004 (wet areas) and AS4654.1:2012 (external above-ground). The dual positive/negative-side approval is unique among standard waterproofing membranes.

  • Can I apply 988 CWP to damp surfaces?
    Performance

    Yes. The cementitious chemistry works on damp substrates - useful for retrofit waterproofing where the structure can't be fully dried. Resists efflorescence in below-grade applications.

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