Forspec Actflex 929SL Moisture Cured Polyurethane Waterproofing Membrane 20kg for internal and external waterproofing applications, providing a seamless, high-strength, Class III waterproof membrane for balconies, bathrooms, rooftops, and wet areas
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ACTFLEX 929 SL - Self-Levelling Polyurethane Waterproofing Membrane

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ACTFLEX 929 SL is a high-performance, high-solid polyurethane liquid waterproofing membrane designed for both horizontal and vertical applications. Its unique formulation combines self-levelling properties with medium non-sag characteristics, ensuring superior coverage and thickness in critical areas. Ideal for rooftops, external wet areas, and internal wet areas, it provides a seamless finish with consistent thickness throughout the application.

Self-levelling formula for smooth, seamless finishes Self-levelling formula for smooth, seamless finishes
Highly flexible with 750% elongation at break Highly flexible with 750% elongation at break
Single-component, moisture-cured waterproofing membrane Single-component, moisture-cured waterproofing membrane
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Forspec Actflex 929SL Moisture Cured Polyurethane Waterproofing Membrane 20kg for internal and external waterproofing applications, providing a seamless, high-strength, Class III waterproof membrane for balconies, bathrooms, rooftops, and wet areas

ACTFLEX 929 SL - Self-Levelling Polyurethane Waterproofing Membrane

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517
ACTFLEX 929 SL - Self-Levelling Polyurethane Waterproofing Membrane
$193.00
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Potable water safe. Ideal for concrete water tanks and reservoirs.

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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
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 929 SL is a Class III self-levelling, single-component moisture-cured polyurethane waterproofing membrane designed for internal and external under-tile applications including non-exposed wet areas. The self-levelling formula delivers a smooth, seamless flat finish. Tough, highly flexible and root-resistant. Compliant with AS3740:2021 and AS4654.1:2012.
Membrane Classification Class III
Chemical Base Moisture-cured polyurethane
Cure Mechanism Chemical reaction with atmospheric moisture
Colour Grey
Density 1.1–1.3 g/cm³
Tensile Strength 4.09 MPa
Elongation at Break 750%
Tear Propagation Resistance No fatigue cracking – Pass
Tack Free Time 12 hours @ 25°C, 50% RH
Recoat Time 24 hours (max 48 hours) @ 25°C, 50% RH
Full Cure 48 hours @ 25°C, 50% RH
Waterproof Time After full cure (48 hours @ 25°C / 50% RH)
Foot Traffic Light foot traffic after cure
Vapor Pressure @ 25°C ASTM E96 – Pass
Application Temperature 10°C–30°C
Recommended Thickness 1.2 mm
Coverage 8–10 m² per 20 kg at 1.2 mm DFT
Application Method Self-levelling viscous liquid
Chemical Resistance Yes
Shelf Life 12 months in unopened containers

Key applications

  • Internal and external wet areas
  • Foundations, basements, ground floors & suspended slabs
  • Roof terraces and roofs (non-exposed), balconies & patios
  • Planter boxes & above-ground pits
  • Bridges, walkways, sub stations & parking decks
  • Industrial floors and warehouse surfaces
  • Concrete and metal surfaces
  • General maintenance and repairs

Surface suitability

  • Concrete (cured 28+ days, wood-trowel finish, primed)
  • Renders & screeds (cured 7+ days, primed)
  • Fibre cement sheets — walls (min. 6mm, wet area grade)
  • Compressed fibre cement (min. 15mm, wet area grade)
  • Brickwork, blockwork & masonry (primed)
  • Asbestos, sycon & cement surfaces (primed)
  • Timber, metal & PVC surfaces (with appropriate primer)

Not suitable for sunlight/UV exposure — must be UV top-coated after curing. Not for direct tile adhesion (requires cement screed over the membrane). Not for swimming pools, ponds or chlorine environments. May slump on vertical surfaces or flow toward drains, potentially blocking drainage points. Limited root resistance — not for aggressive or deep-rooted species. Not a vapour barrier; not for negative-side pressure.

Calculate your coverage

You will need:

ACTFLEX 929 SL - Self-Levelling Polyurethane Waterproofing Membrane

ACTFLEX 929 SL - Self-Levelling Polyurethane Waterproofing Membrane

20kg Kit

0 Kits

Total coverage: 0 m²

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

Technical Specifications

Membrane ClassificationClass III
Chemical BaseMoisture-cured polyurethane
Cure MechanismChemical reaction with atmospheric moisture
ColourGrey
Density1.1–1.3 g/cm³
Tensile Strength4.09 MPa
Elongation at Break750%
Tear Propagation ResistanceNo fatigue cracking – Pass
Tack Free Time12 hours @ 25°C, 50% RH
Recoat Time24 hours (max 48 hours) @ 25°C, 50% RH
Full Cure48 hours @ 25°C, 50% RH
Waterproof TimeAfter full cure (48 hours @ 25°C / 50% RH)
Foot TrafficLight foot traffic after cure
Vapor Pressure @ 25°CASTM E96 – Pass
Application Temperature10°C–30°C
Recommended Thickness1.2 mm
Coverage8–10 m² per 20 kg at 1.2 mm DFT
Application MethodSelf-levelling viscous liquid
Chemical ResistanceYes
Shelf Life12 months in unopened containers

Downloads

Real Projects. Real Results.

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  • Pool Renovation Pool Renovation Before After

    Pool Renovation

    Gold Coast, QLD

  • Below Ground Retaining Wall Below Ground Retaining Wall Before After

    Below Ground Retaining Wall

    Sydney, NSW

  • Concrete Water Tank Concrete Water Tank Before After

    Concrete Water Tank

    Perth, WA

  • Commercial Podium Commercial Podium Before After

    Commercial Podium

    Melbourne, VIC

  • Before After

    Swimming Pool Construction

    Brisbane, QLD

How to install

Watch the install

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

Watch the install poster

Why Choose

The Waterproofing Shop?

We supply premium waterproofing products backed by expert advice, fast service and real-world experience.

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Owned & Operated
30+ Years in the Waterproofing Industry 30+ Years in the
Waterproofing Industry
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Frequently asked questions

View all FAQs
  • What is 929 SL and how is it different from 929 HV?
    Compatibility

    929 SL (Self-Levelling) flows out to a smooth seamless finish on horizontal surfaces. 929 HV (High Viscosity) stays put on verticals. Both are single-component moisture-cured polyurethane membranes - use SL on floors, HV on walls and upstands.

  • What's the elongation rating?
    Performance

    929 SL achieves a remarkable 750% elongation at break with tensile strength of 4.09 MPa. The high flexibility accommodates substrate movement and minor cracking without rupture.

  • How is it applied?
    Installation

    Pour the product onto the substrate and let it self-level. Spread with a notched squeegee if needed for uniform thickness. 8-10 m² per 20kg pail at 1.2mm DFT. Application temperature 10-30°C.

  • Where is 929 SL ideal?
    Compatibility

    Ideal for horizontal floor applications where seamless finish matters: large planter floors, plant rooms, wet area floors needing smooth substrate before tiling, and any flat surface where roller marks are unacceptable.

  • Standards compliance?
    Compliance

    Class III waterproofing membrane. Root-resistant cured film makes it suitable for planter boxes and green roofs alongside the standard 929 HV system. Tack-free 12hr, recoat 24-48hr, full cure 48hr.

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