What is ACTFLEX 988 CWP used for?

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?

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?

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?

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?

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.

Forspec ACTFLEX 988 CWP two-part flexible cementitious waterproofing membrane

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ACTFLEX 988 CWP 2 Part Cementitious Membrane

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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

Flexible cementitious formula with 217% elongation

Suitable for positive and negative side applications

Size: 20KG

20KG$220.0010KG$154.00Sold out

Quantity: 1

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ACTFLEX 988 CWP 2 Part Cementitious Membrane

20KG

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Pickup available, usually ready in 24 hours

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Product Details

FORSPEC 988 CWP offers a comprehensive solution to moisture-related challenges with its advanced features and versatile applications:

Anti-Efflorescence Membrane
Hydrostatic Pressure Resistance up to 350 KPa or 35-meter head of water
Exceptional Adhesion to PVC Panels (such as Dincel and AFs Walls)
Effective Rising Damp Prevention
Suitable for a range of environments including Bathrooms, Balconies, Podiums, Retaining walls, and Basements
Superior Swimming Pool Waterproofing Membrane

ACTFLEX 988 CWP stands out as a specialized waterproofing agent engineered to safeguard various substrates against water infiltration. Whether it's protecting structures from efflorescence, withstanding high hydrostatic pressures, or ensuring adhesion to PVC panels, this product delivers reliable performance and peace of mind.

How to Use

Apply by brush, roller or trowel in two coats

Technical Specifications

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)

Product Files

ACTFLEX 988 CWP 2 Part Cementitious Membrane20KG

$220.00

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System Build-Up Guide

Correct application makes all the difference.

View All Details

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

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

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

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.

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.

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ACTFLEX 988 CWP 2 Part Cementitious Membrane

20kg kit

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Technical Specifications

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)

Downloads

Real Projects. Real Results.

View All Projects

Before After
Pool Renovation
Gold Coast, QLD
Before After
Below Ground Retaining Wall
Sydney, NSW
Before After
Concrete Water Tank
Perth, WA
Before After
Commercial Podium
Melbourne, VIC
Before After
Swimming Pool Construction
Brisbane, QLD

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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.

ACTFLEX 988 CWP 2 Part Cementitious Membrane

Frequently bought together

Pool System Build-Up

Retaining Wall System Build-Up

Tank System Build-Up

Technical overview

Key applications

Surface suitability

Calculate your coverage

Technical Specifications

Downloads

Pool Renovation

Below Ground Retaining Wall

Concrete Water Tank

Commercial Podium

Swimming Pool Construction

The Waterproofing Shop?

Frequently asked questions

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