For wet area tiling, structural joints, and commercial projects where building movement splits liquid membranes, Elastoproof B10 / B50 provides a high-elasticity physical barrier. This approved bondbreaker system conforms to AS 3740, protecting critical wall and floor junctions without the need for sealant backing or bond-breaking tapes.
The system consists of an acrylonitrile butadiene rubber (NBR) band with a 20mm central stretch zone, flanked by a polyester fleece carrier edging. When embedded into a wet liquid membrane, the fleece edges bond to the substrate while the central rubber span remains unbonded. This creates a defined slip zone over control joints, substrate abutments, and expansion joints. By preventing the liquid membrane from bonding directly to the moving joint, the band redistributes localized stress across its 70mm rubber width, accommodating multi-directional movement with up to 100% elastic recovery without tearing.
This joint band is suitable for residential, commercial, and industrial waterproofing applications. Use it at:
It is compatible with Gripset Class I, Class II, and Class III waterproofing membranes.
Measure and cut the Elastoproof B10 / B50 Joint Band to suit the joint layout. Apply a first coat of compatible Gripset liquid membrane approximately 150mm wide, extending up the wall and onto the floor. Embed the band into the wet membrane bed, ensuring the fleece carrier edges are fully wet out and no air bubbles are trapped behind the fabric. The rear central rubber section must remain unbonded to the substrate. Overlap adjoining lengths by a minimum of 50mm. Use Elastoproof Prefabricated Corners at 90° internal and 270° external junctions. If prefabricated corners are not used, cut and fold the bottom leg of the band, ensuring the fabric is completely bonded with the liquid membrane.
What is Elastoproof B10/B50 used for?
It acts as a flexible joint band and bondbreaker at waterproofing junctions and movement-prone joints.
What water pressure resistance is stated?
3 bar in the current product evidence.
How much overlap is required between lengths?
At least 50mm.
Can solvent-based materials be applied over it?
No. Solvent-based adhesives, sealants and coatings are excluded.
| Property | Value |
|---|---|
| Base Chemistry | NBR (Acrylonitrile Butadiene Rubber) |
| Carrier Edge | Polyester fleece with lateral flexibility |
| Dimensions | 120 mm |
| Thickness | 0.6–0.8 mm |
| Rubber Width | 70 mm span with 20 mm central stretch zone |
| Weight | 50 g/m |
| Shore A Hardness | 65 |
| Temperature Resistance | -20°C to 90°C |
| Tensile Strength (Lateral) | >1.0 N/mm² |
| Tensile Strength | >7.0 N/mm² |
| Elongation | >208% |
| Rupture Strain (Longitudinal) | >48% |
| Moisture Vapour Transmission Resistance (μ) | 8.4 |
| Equivalent Air Thickness (sd) | 5.0 |
| Water Resistance | 3 bar |
| Fire Performance | B3, F |
| Chemical Resistance | Lactic acid 5%; Acetic acid 5%; Hydrochloric acid 3%; Chloric acid 3%; Sulphuric acid 35%; Citric acid 10%; Potassium hydroxide 20%; Sodium hypochlorite 0.3 g/L; Sea water (sea salt 20 g/L); Lime milk pH 12.5; Sodium hydroxide solution pH 14; Diesel oil; Grease; Oil; Paraffin |
| Maximum Starting Joint Width | 20 mm |
| Movement Capability | Up to 50% of starting joint width |
| Standards Compliance | AS 3740 |
| Packaging Options | 120 mm × 50 m roll; 120 mm × 10 m roll |
| System Compatibility | Compatible with Gripset Class I, II and III liquid membranes |
| Material | NBR (acrylonitrile butadiene rubber) |
| Water Vapour Transmission | 8.4 |
| Joint Width | 20mm (maximum) |
Here are some common examples on where Gripset Elastoproof B10 / B50 used by our customers.
