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
ACTFLEX 988 CWP 2 Part Cementitious Membrane
or 4 interest-free payments with
Class II under both standards, positive or negative side, hydrostatic pressure to 350 kPa.
ACTFLEX 988 CWP is a two-part cementitious acrylic membrane for below-ground and water-retaining work. It is independently certified Class II under both AS/NZS 4858 and AS 4654.1, with cyclic movement passed under both standards. It is approved for positive-side and negative-side systems, including PVC panel systems, and is normally primerless on sound concrete.
Where to use it
- Below-ground waterproofing: basements, retaining walls and lift pits, within approved systems
- Water tanks, swimming pools, reservoirs and other water-retaining structures
- Approved positive-side and negative-side systems, including PVC panel systems
- Internal and external wet areas
- Facade waterproofing and efflorescence control
Why waterproofers buy it
- Certified Class II under both AS/NZS 4858 and AS 4654.1, cyclic movement pass on both
- Hydrostatic pressure resistance 350 kPa
- Certified adhesion to prepared PVC, 1.44 MPa mean pull-off, complete PVC substrate failure in testing
- Normally primerless. Self-priming on sound, correctly prepared concrete
- Recoat 4 to 6 hours, light foot traffic 6 to 8 hours at 25C, 50% RH
- Certified VOC content 2 g/L
- Applies to cured damp surfaces, controls efflorescence, will not re-emulsify after curing
Coverage
20kg kit: approx. 8 to 10 m² at 1.2mm DFT, two coats.
20kg kit: approx. 6.4 to 8 m² at 1.5mm DFT, three coats, for below-ground and water-retaining work.
Not for
Not a stand-alone UV-exposed membrane, not a permanent trafficable surface. Negative-side PVC panel systems require project-specific Forspec approval.
All times at 25°C and 50% RH.
Certified Class II under both AS/NZS 4858 and AS 4654.1
Hydrostatic pressure resistance up to 350 kPa, positive and negative side
Normally primerless - certified bond test run with no primer
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ACTFLEX 988 CWP 2 Part Cementitious Membrane
20KG
The Waterproofing Shop
22/872 Canterbury Road
Roselands NSW 2196
Australia
Product Details
How to Use
Technical Specifications
ACTFLEX 988 CWP 2 Part Cementitious Membrane
Sale price$220.00
Frequently bought together
System Build-Up Guide
Correct application makes all the difference.
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
Key applications
- Below-ground waterproofing - basements, retaining walls and lift pits
- Water tanks, reservoirs and water-retaining structures
- Swimming pools
- Positive-side and negative-side systems including PVC panel systems
- Internal and external wet areas
- Facade waterproofing and efflorescence control
- Under-render and over-render within Forspec pool and tank systems
- Hydrostatic pressure applications up to 350 kPa
Surface suitability
- Concrete (newly poured, minimum 28 days cured)
- Cementitious render (minimum 7 days cured)
- Cement screed (minimum 48 hours cured, longer for thick screeds)
- Masonry and brickwork (misted with water and coated while damp)
- PVC panels (washed, lightly abraded, isopropyl alcohol wiped - no primer)
- CFC sheeting (with ACTFLEX EP250 where required by the approved system)
- Plasterboard (with ACTFLEX EP250 where required by the approved system)
Not a stand-alone UV-exposed membrane and not a permanent trafficable surface. Apply only between 10C and 35C ambient and substrate; never when rain is imminent or over condensation, standing water or active water ingress. Stop active ingress with ACTFLEX HYDROPLUG first. Never add solvent. Mechanical mixing only. Minimum 10 days cure before permanent water immersion. Negative-side PVC panel systems require project-specific Forspec approval.
Calculate your coverage
You will need:
ACTFLEX 988 CWP 2 Part Cementitious Membrane
20kg kit
0 Kits
Total coverage: 0 m²
This is an estimate only. Add 10% for wastage.
Technical Specifications
| Membrane Classification | Class II (AS/NZS 4858:2004 and AS 4654.1-2012) |
| Chemical Base | Two-part flexible cementitious acrylic |
| Colour | Khaki green |
| Mix Ratio | Part A liquid : Part B powder = 1 : 1.5 by weight |
| Kit Size | 20kg (8kg Part A liquid + 12kg Part B powder) |
| Solids Content | 65% (+/- 2%)* |
| Elongation at Break | 239% (AS/NZS 4858, Report 250-2); 220% (AS 4654.1, Report 250-3) |
| Tensile Strength | 2.31 MPa (AS/NZS 4858, Report 250-2); 1.74 MPa (AS 4654.1, Report 250-3) |
| Cyclic Movement | Pass, no failures observed - both standards |
| Bond Strength | 42.86 N (ASTM C794, unprimed concrete, Report 250-3) |
| Adhesion to Prepared PVC | 1.44 MPa mean pull-off (ASTM D4541-02) - complete PVC substrate failure |
| Water Absorption | 3.81% (Report 250-2) |
| Water Vapour Transmission | 1.99 g/m2/24h (Reports 250-2, 250-3) |
| Hydrostatic Pressure Resistance | 350 kPa (3.5 bar)* |
| Shore Hardness | 46 Shore A* |
| VOC Content | 2 g/L (ASTM D3960/D2369, FORAY NATA 1231 Certificate P23010038) |
| Cure Mechanism | Hydraulic cementitious reaction and acrylic coalescence |
| Pot Life | Approx. 2 hours @ 25C, 50% RH* |
| Tack Free Time | 6 hours @ 25C, 50% RH |
| Recoat Time | 4-6 hours @ 25C, 50% RH; confined underground areas minimum 24 hours |
| Light Foot Traffic | 6-8 hours @ 25C, 50% RH |
| Full Cure | Minimum 48 hours; confined or poorly ventilated areas minimum 7 days; minimum 10 days before permanent water immersion |
| Maximum Interval Before Next Approved Layer | 5 days |
| Application Temperature | 10-35C ambient and substrate |
| Recommended Thickness | 1.2mm DFT (2 coats, wet areas and PVC positive side); 1.5mm DFT (3 coats, below-ground and water-retaining) |
| Coverage | 20kg kit approx. 8-10m2 @ 1.2mm DFT; approx. 6.4-8m2 @ 1.5mm DFT |
| Shelf Life | 12 months unopened, stored as specified |
| * Typical Forspec R&D characteristic values | |
Real Projects. Real Results.
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Before
After
Pool Renovation
Gold Coast, QLD
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Before
After
Below Ground Retaining Wall
Sydney, NSW
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Before
After
Concrete Water Tank
Perth, WA
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Before
After
Commercial Podium
Melbourne, VIC
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Before After
Swimming Pool Construction
Brisbane, QLD
Watch the install
Step-by-step from prep to top coat. Filmed on the tools, not in a studio.
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Frequently asked questions
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What is ACTFLEX 988 CWP used for?
Compatibility988 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.
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What hydrostatic pressure can it resist?
Performance988 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.
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How is it mixed and applied?
InstallationTwo-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.
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Standards compliance?
ComplianceCertified to AS4858-2004 (wet areas) and AS4654.1:2012 (external above-ground). The dual positive/negative-side approval is unique among standard waterproofing membranes.
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Can I apply 988 CWP to damp surfaces?
PerformanceYes. 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.