Elastoproof B50 Joint Band System: A Technical Overview
Built around a high-strength NBR rubber core with polyester-fleece edging, the B50 bridges and decouples membrane stress at movement zones. The 20 mm central stretch zone accommodates multi-directional movement with up to 100% elastic recovery. Fleece edges are embedded into a fresh, wet liquid membrane to achieve intimate contact, eliminating air pockets and ensuring durable, watertight detailing at the most failure-prone points of a waterproofing system.
Core Features & Specifications
- Approved bond breaker for domestic wet areas to AS 3740.
- Movement parameters: max starting joint width 20 mm; movement capacity up to 50% of starting width.
- Temperature resistance −20 °C to 90 °C for broad climate resilience.
- Water pressure resistance 3 bar; µ (moisture vapour resistance) = 8.4; equivalent air thickness sd = 5.0.
- Chemically resistant (acids/alkalis/chlorinated/saline water) for demanding environments.
- Roll sizes: 120 mm × 10 m and 120 mm × 50 m; prefabricated internal (90°) & external (270°) corners available.
The Elastoproof B50 Advantage
- Replaces traditional sealant bond breakers and tapes—faster, cleaner detailing.
- Minimises stress transfer into the membrane at joints and corners, reducing call-backs.
- Factory corners help maintain continuity through complex intersections.
- Consistent, repeatable results across commercial, industrial, and residential sites.
Proactive Troubleshooting
Scenario: Bedding into a skinned or dry membrane
Potential Outcome: Poor wet-out and local adhesion loss leading to leaks.
Adheseal Best Practice: Always embed B50 into a fresh, wet membrane layer and brush/roll to expel air from fleece edges.
Scenario: Exceeding movement capacity
Potential Outcome: Central zone fatigue and premature failure.
Adheseal Best Practice: Keep starting joint width ≤ 20 mm and design for ≤ 50% movement of that width.
Applications in Practice: Trade Scenarios
For Waterproofers (Specifier/Engineer): Wet-area junctions to AS 3740
The Professional's Challenge
Achieve compliant detailing at wall/floor junctions where movement concentrates and membranes typically fail.
The Adheseal Solution: Engineered Certainty in Practice
B50’s fleece edges embed into wet membrane for uniform adhesion, while the central Flexible Zone decouples movement—maintaining seal integrity at these critical points.
Best Practice Note
Overlap band lengths by ≥ 50 mm and use factory corners at 90°/270° intersections to maintain continuity.
For Builders (Business Owner/Operator): Control & expansion joints
The Professional's Challenge
Movement at slab joints can telegraph through membranes, causing cracks or leaks.
The Adheseal Solution: Engineered Certainty in Practice
By bridging the joint and isolating the membrane from direct substrate movement, B50 preserves the waterproofing layer and reduces remediation risk.
Best Practice Note
Confirm joint widths and expected movement; select a suitably elastic membrane over the band to match site conditions.
Frequently Asked Questions
What joint movement can B50 accommodate?
B50 is designed for a maximum starting joint width of 20 mm and accommodates up to 50% movement of that width, with up to 100% elastic recovery in the central zone.
Do I embed the band into wet or dry membrane?
Always embed the fleece edges into a fresh, wet liquid membrane to ensure complete wet-out and adhesion. Apply a second coat to fully encapsulate the band.
Can I use prefabricated corners?
Yes. Prefabricated internal (90°) and external (270°) corners are available and recommended to maintain continuity through junctions and reduce on-site fabrication errors.
Is long-term UV exposure acceptable?
No. B50 is not intended as an exposed, UV-resistant joint seal. It should be encapsulated within the waterproofing system.
What temperature range can B50 handle in service?
The specified temperature resistance is −20 °C to 90 °C, suitable for a wide range of Australian conditions.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Wall/Floor Junctions | Seamless, flexible transition minimises membrane stress and leaks. | Waterproofers, Tilers |
| Substrate Abutments | Isolates differential movement to protect the membrane. | Waterproofers, Builders |
| Control Joints | Accommodates movement up to 50% of starting joint width. | Waterproofers, Concrete Contractors |
| Movement & Expansion Joints | Decouples structural movement from the membrane layer. | Builders, Waterproofers |
| Corner Intersections (90°/270°) | Factory corners improve continuity and reduce on-site errors. | Waterproofers, Builders |
| Crack Bridging (Non-structural) | Flexible bridging layer to prevent localised leakage. | Remedial Contractors, Waterproofers |
Applying Elastoproof B50 Joint Band System: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure substrates are clean, dry, sound and smooth; remove contaminants; repair defects; comply with relevant standards for wet areas.
Mechanical Conditioning
Grind/abrade to remove weak layers and provide a clean surface; vacuum dust before priming.
Moisture & Temperature
Apply only when surfaces are dry and between 5 °C and 30 °C (surface temperature).
Timing: Prime and apply membrane immediately before embedding the band.Pro Tip: Confirm joint width ≤ 20 mm to remain within the movement envelope. -
Measure, Cut & Dry Fit
Pre-cut lengths to suit each run and corner; allow for ≥ 50 mm overlaps at joins; use factory corners where possible.
Straight Runs
Cut slightly long for final trim; check alignment over the joint centreline.
Custom Corners
If not using factory corners, create a foldable corner by a vertical incision on a short length, then form and bed into wet membrane.
Timing: Prepare lengths before opening/rolling membrane to avoid skinning.Pro Tip: Keep pre-cut pieces clean and dust-free for optimal adhesion. -
Embed into Wet Membrane
Apply the first coat of liquid membrane in a ~150 mm band centred over the joint. Embed B50 into the fresh membrane and press firmly.
Brush-in
Use a firm brush to wet-out fleece edges and remove trapped air.
Roll-in
Light rolling ensures intimate contact without stressing the central flexible zone.
Timing: Embed while the membrane is wet; do not allow skinning.Pro Tip: Maintain central alignment of the flexible zone over the joint line. -
Overlap, Cornering & Encapsulation
Overlap band lengths by ≥ 50 mm. Use prefabricated internal/external corners where possible. Apply a second coat to fully encapsulate.
Second Coat
Brush/roll to seal the fleece completely and achieve the membrane’s specified film build.
Cure & Protect
Observe the membrane manufacturer’s recoat and cure times; protect from traffic until cured.
Timing: Follow the membrane’s schedule for recoats and service readiness.Pro Tip: Document joints and overlaps for QA and warranty records.
Limitations & Safety
Product Limitations
Not compatible with solvent-based adhesives, sealants or coatings.
Not intended as an exposed, UV-resistant joint seal in external applications.
Apply only when surface temperature is between 5 °C and 30 °C.
Design joints to remain within the stated movement envelope (≤ 20 mm starting width; ≤ 50% movement).
Safety & Handling Requirements
Personal Protective Equipment
Wear gloves, long sleeves and safety glasses during cutting/handling and membrane application.
Ventilation Requirements
Ensure adequate ventilation when using primers and liquid membranes; follow their SDS.
Fire & Handling Precautions
Store away from ignition sources. Check the selected primer/membrane SDS for flammability and handling advice.
Emergency First Aid
Eyes:
Flush with clean water for at least 15 minutes. Seek medical advice if irritation persists.
Skin:
Wash with soap and water; remove contaminated clothing.
Inhaled:
Move to fresh air; seek medical attention if symptoms occur.
Swallowed:
Do not induce vomiting. Rinse mouth and seek medical attention immediately.
Seek medical attention immediately in cases of serious exposure.
Elastoproof B50 Joint Band System Application Guide
Concrete (New/Existing)
Surface Preparation
Clean, sound, smooth and dry; remove laitance, release agents and contaminants by mechanical means. Repair voids and non-structural cracks; ensure formed joints are clean and dry.
Primer Requirements
Primer required per liquid membrane system
Apply the membrane manufacturer’s nominated primer, then a 150 mm wet membrane strip. Embed B50 centrally and brush firmly to wet-out fleece.
Use primer specified by the chosen membrane systemMasonry / Render
Surface Preparation
Remove loose sand/friable material; make joints flush and repair defects. Ensure junctions are even for uniform band bedding.
Primer Requirements
Primer required per liquid membrane system
Prime as directed. Embed B50 into wet membrane and fully encapsulate with a second coat.
System-compatible masonry primerFibre Cement & Wet-Area Plasterboard
Surface Preparation
Install linings to manufacturer standards; ensure fasteners are flush, joints treated, and surfaces clean and dry.
Primer Requirements
Primer recommended for optimal adhesion
Follow membrane system guidance. Apply wet membrane (150 mm) and embed B50; overcoat to encapsulate.
Membrane-system primerTimber & Plywood
Surface Preparation
Structurally sound, firmly fixed sheets with adequate support; sand high spots; remove dust/oils; seal exposed edges where required.
Primer Requirements
Primer required for critical applications
Prime per membrane system; bed B50 into wet membrane and roll/brush to expel air.
System-nominated timber primerMetals (Aluminium, Galvanised, Stainless, Mild Steel)
Surface Preparation
Degrease; lightly abrade; remove rust and sharp edges; clean and dry before priming.
Primer Requirements
Primer required for non-porous substrates
Apply the membrane system’s metal/non-porous primer. Embed B50 into wet membrane; fully encapsulate.
Approved non-porous/metal primerExisting Membranes
Surface Preparation
Ensure the existing membrane is sound, clean and compatible. Lightly abrade if advised by the membrane manufacturer.
Primer Requirements
Primer may be required subject to compatibility
Follow the re-coat/overlay protocol of the selected membrane. Maintain ≥ 50 mm overlaps between band lengths and at corners.
Compatibility primer as directed
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