Gripset Xpress Multi Pro: A Technical Overview
Gripset Xpress Multi Pro is a water-based, solvent-free waterproofing membrane designed for speed-critical external and internal applications. Forming a rain-resistant skin in just 3 hours, it enables early exposure to ponding water and eliminates washout risks. The elastomeric formulation delivers >300% elongation for dynamic substrates, while UV-stabilised polymers ensure long-term resistance in exposed environments. Low vapour transmission and water absorption ratings make it ideal for concrete, fibre cement, and green/damp surfaces when used with Xpress H2O Plus primer. Whether under tiles or exposed as a trafficable finish, Xpress Multi Pro delivers consistent, compliant results under AS 4858 and AS 4654.2.
Core Features & Specifications
- Ultra-fast rain resistance within 3 hours of application
- Solvent-free and non-hazardous for safer application
- >300% elongation for flexible and dynamic substrate movement
- Low vapour transmission (6g/m²/24h) and water absorption (3%)
- UV and weather-resistant finish for exposed applications
- Compliant with AS 4858 and AS 4654.2 waterproofing standards
- Available in 15L pails with coverage up to 10m² for 2 coats
- Light trafficable surface once cured
The Gripset Xpress Multi Pro Advantage
- Accelerates job completion timelines—ideal for tight schedules and unpredictable weather
- Eliminates rework risks with early ponding water resistance
- Supports safe working environments with a solvent-free formulation
- Handles thermally active joints without blistering or delamination
- Performs reliably across Australia’s varied climates and UV zones
Proactive Troubleshooting
Scenario: Applying to damp or green concrete without correct primer
Potential Outcome: Reduced adhesion, blistering, or eventual membrane failure due to moisture entrapment.
Adheseal Best Practice: Always use Xpress H2O Plus or Gripset E60 on damp/mineral surfaces. Check RH with ASTM F2170 or MC with ASTM F2659 if in doubt.
Scenario: Inadequate film thickness during application
Potential Outcome: Waterproofing system fails to meet AS4654.2 compliance and lacks ponding resistance.
Adheseal Best Practice: Use a wet film gauge to verify 750 microns per coat. Minimum of 1.5L/m² for internal wet areas and 2L/m² for exposed finishes.
Applications in Practice: Trade Scenarios
For Waterproofers (Specifier/Engineer): External Rooftop Waterproofing with Ponding Risk
The Professional's Challenge
External rooftops exposed to weather before screed installation often fail due to re-emulsification after rain or dew. Compliance with AS 4654.2 can be compromised if ponding occurs within 24 hours.
The Adheseal Solution: Engineered Certainty in Practice
Gripset Xpress Multi Pro becomes ponding-resistant within 3 hours. Applied in 3 coats (2L/m²), it delivers a 1.0mm dry film thickness and can withstand early weather exposure. Use with Gripset E60 for rising damp.
Best Practice Note
Stagger coats in perpendicular directions for consistent film coverage. Check ambient temp (10–35°C) to ensure cure rate aligns with scheduling.
For Tilers (On-Site Applicator): Balcony or Wet Area Under-Tile Waterproofing
The Professional's Challenge
Balcony jobs often get delayed due to long membrane cure times or incompatibility with tile adhesives, especially under time pressure from other trades.
The Adheseal Solution: Engineered Certainty in Practice
Xpress Multi Pro cures in 24 hours and accepts polymer-modified adhesives like Gripset C-LITE or C-RUBBER for same-week tiling. Two coats (1.5L/m²) ensure 0.8mm dry film compliance with AS 4858.
Best Practice Note
Use Elastoproof B50 Joint Band at wall/floor junctions for compliant bond breaking and enhanced crack-bridging durability.
Frequently Asked Questions
Can I apply Gripset Xpress Multi Pro on green or damp concrete?
Yes, provided the correct primer is used. For green or damp substrates with residual moisture, use Xpress H2O Plus or Gripset E60 to ensure proper adhesion and avoid moisture entrapment or blistering.
Is Gripset Xpress Multi Pro trafficable once cured?
Yes, it is suitable for light foot traffic after full cure (approximately 24 hours at 23°C, 50% RH). For exposed applications, apply 3 coats to achieve a 1.0 mm dry film thickness for durable, walkable performance.
What adhesives are compatible for tiling over Xpress Multi Pro?
Use only polymer-modified cement-based adhesives such as Gripset C-LITE, C-MASTIC, or C-RUBBER. Always allow 24 hours curing time before tiling to ensure proper membrane integrity and bond strength.
Can I screed over the membrane?
Yes. Use Gripset 11Y as a bonding agent and water-resistant additive when screeding over Xpress Multi Pro. Alternatively, consider Gripset C-BED engineered screed system for maximum performance.
Is the membrane UV resistant and suitable for exposed roofs?
Yes. Xpress Multi Pro is UV-stabilised and designed for exposed applications such as roofs, terraces, balconies, and parapets. Apply 3 coats to meet outdoor traffic and weather resistance requirements.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Exposed Roof Membrane | UV and weather resistant finish with light trafficability after curing | Waterproofers, Builders |
| Balconies, Terraces, Podiums | Fast cure for tiling or screeding; flexible membrane for joint movement | Tilers, Builders |
| Internal Wet Areas (Bathrooms, Laundries) | AS 4858 compliance with low vapour transmission and early recoat time | Tilers, Waterproofers |
| Green Concrete or Damp Substrates | Compatible with Xpress H2O Plus primer to enable application over early-age concrete | Remedial Contractors, Waterproofers |
| Parapets, External Vertical Surfaces | Brushable membrane with excellent vertical hold and UV durability | Builders, Remedial Contractors |
| Tiled Areas with Moisture Ingress Risk | Acts as a full moisture barrier under tile adhesives | Tilers |
Applying Gripset Xpress Multi Pro: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure all surfaces are clean, dry (or appropriately primed for moisture), sound, and free of laitance, dust, grease, coatings, moss, or contaminants that could impair adhesion.
Dry Surfaces
Mechanically clean with vacuum or pressure air. Prime with Gripset GP Primer.
Damp / Green Concrete
Use Xpress H2O Plus primer or Gripset E60 for surfaces exceeding 80% RH or 5% MC. Perform ASTM F2170 or F2659 tests as required.
Timing: Allow primers to dry as per their respective datasheets before membrane application.Pro Tip: For high-absorption surfaces, apply a second primer coat to prevent membrane under-bonding and pinholing. -
Joint Detailing & Bond Breakers
All joints, transitions, penetrations, and drainage points must be correctly sealed before membrane application using suitable detailing materials.
Option A: Elastoproof B50 Joint Band
Embed band into wet coat of membrane, press out air pockets, and top-coat immediately.
Option B: BRW PF Tape
Apply dry tape over joints, remove release liner, press firmly using a roller or spatula, then apply membrane over the top.
Timing: Detail all critical areas before beginning main membrane coats.Pro Tip: Use preformed Elastoproof Corners for neat, compliant 90° and 270° transitions. -
Membrane Application
Apply Gripset Xpress Multi Pro in multiple coats to achieve required film build for the exposure and service conditions.
Internal Wet Areas
Apply 2 coats at 750 microns wet film per coat (1.5L/m² total) for a minimum 0.8mm dry film thickness.
Exposed or Trafficable Surfaces
Apply 3 coats at 750/750/500 microns wet film (2L/m² total) to achieve 1.0mm dry film. Use perpendicular strokes per coat.
Timing: Recoat after 1–2 hours. Membrane is ponding-resistant after 3 hours. Full cure in 24 hours.Pro Tip: Use a wet film gauge to verify coat thickness. Apply coats in alternating directions for even coverage. -
Tiling, Screeding & Finishing
After full membrane cure, tiling or screeding can be performed using compatible adhesives or screed systems.
Tiling
Use polymer-modified cement adhesives such as Gripset C-LITE, C-RUBBER, or C-MASTIC.
Screeding
Incorporate Gripset 11Y or use Gripset C-BED screed system for enhanced bond to membrane.
Timing: Allow a minimum of 24 hours cure before installing tiles, screed, or toppings.Pro Tip: Always verify dry film thickness meets AS 4858 and AS 4654.2 standards before tiling or handover.
Limitations & Safety
Product Limitations
Not suitable for areas exposed to negative hydrostatic pressure. Use alternative systems for below-grade or pressurised water applications.
Do not apply when rain is imminent or when surface temperature is below 5°C or above 30°C.
Not resistant to solvent or petroleum-based chemical spills. Avoid use in environments with fuel, oil, or hydrocarbon exposure.
All topcoats or finishes must be solvent-free to avoid compromising membrane integrity.
Safety & Handling Requirements
Personal Protective Equipment
Wear safety gloves (nitrile or chemical resistant), safety goggles, and protective clothing to avoid skin and eye contact. Use barrier cream if handling for extended periods.
Ventilation Requirements
Use in well-ventilated areas. Although solvent-free, avoid prolonged inhalation of vapour or mist in enclosed spaces.
Fire & Handling Precautions
Non-flammable. However, store away from heat sources and avoid freezing conditions. Do not store in direct sunlight or on cold floors.
Emergency First Aid
Eyes:
Rinse immediately with clean water for at least 15 minutes. Seek medical advice if irritation persists.
Skin:
Wash thoroughly with soap and water. Do not use solvents. Remove contaminated clothing.
Inhaled:
Move to fresh air. Seek medical attention if symptoms persist or if breathing difficulty occurs.
Swallowed:
Do not induce vomiting. Rinse mouth with water. Seek immediate medical attention.
Seek medical attention immediately in all cases of serious exposure.
Gripset Xpress Multi Pro Application Guide
Concrete & Render
Surface Preparation
Allow concrete to cure for a minimum of 28 days. Render or screeds require at least 7 days. Remove laitance, dust, oils, curing agents, and contaminants. Level pitted areas using Gripset 11Y or RLA repair mortars.
Primer Requirements
Primer required for critical applications
Use Gripset GP Primer on dry, porous surfaces. For high moisture substrates, use Xpress H2O Plus or Gripset E60.
Gripset GP Primer / Xpress H2O Plus / Gripset E60Compressed Fibre Cement Sheeting
Surface Preparation
Ensure sheets are securely fixed and flush-jointed. Clean of dust and oil residues. Tape all joints and transitions with Elastoproof B50 Joint Band or BRW PF Tape.
Primer Requirements
Primer required for critical applications
Apply Gripset GP Primer for general use or Gripset OP Primer for dense, non-absorbent surfaces.
Gripset GP Primer / Gripset OP PrimerWet Area Timber Sheeting / External Grade Plywood
Surface Preparation
Ensure sheets are moisture resistant, stable, and fixed with staggered joints. Sand if surface is glossy. Remove contaminants and loose fibres.
Primer Requirements
Primer required for critical applications
Use Gripset GP Primer for porous grades or Gripset OP Primer for denser boards. Ensure thorough edge sealing with banding.
Gripset GP Primer / Gripset OP PrimerAerated Concrete Panels & Blocks
Surface Preparation
Remove dust, laitance, and loose material. Repair surface voids using compatible mortar. Sponge off excess dust after mechanical abrasion if needed.
Primer Requirements
Primer required for high absorption substrates
Apply a generous coat of Gripset GP Primer to stabilise porosity and ensure full membrane adhesion.
Gripset GP PrimerPlasterboard (Internal Only)
Surface Preparation
Ensure plasterboard is compliant with wet area standards. Remove dust and surface chalking. Tape joints as per AS3740 using Elastoproof B50 Band.
Primer Requirements
Primer required for paper-faced board
Use Gripset GP Primer to seal and protect the surface against over-absorption and paper delamination.
Gripset GP Primer
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