For critical 90º and 270º corner intersections where joint movement often ruptures standard liquid membranes, Elastoproof Prefabricated Corners provide a continuous, waterproof, and vapour-barrier seal. These prefabricated sections maintain the central flexible zone across wall-to-floor junctions, eliminating the need for complex multi-layered membranes, reinforcing fabrics, bond-breaker tapes, or sealants at volatile corner junctions.
The corners are designed to integrate directly with Elastoproof Jointing Band applications, creating a highly elastic, unified waterproofing system. The central flexible zone enables 100% elastic recovery when exposed to structural movement, preventing tears at the weakest points of the wet area. The high-strength fabric edges embed directly into wet liquid membranes, providing high tear resistance and eliminating the risk of leaks caused by poorly lapped fabrics or hand-welded corners.
To ensure a secure bond and maintain system integrity, installers must adhere to the following sequence:
Prefabricated corners ensure a seamless, elastic seal at joint intersections, directly addressing water ingress risks. They eliminate common failure points associated with lapping, bonding fabrics, or using multiple reinforcement layers at volatile corner areas.
These corners are compatible with all Gripset membranes. However, they are not compatible with solvent-based materials such as solvent-based adhesives, sealants, or coatings, which can compromise product integrity.
Embed the corner profile into a liberal, wet bed of the Gripset membrane. Ensure the fabric edges are fully saturated and all air pockets are removed. Do not allow the membrane to skin or dry before bedding the corner.
Apply these corners only when the surface temperature is between 5°C and 30°C. Application outside this range can affect adhesion and long-term performance.
| Application | Key benefit | Primary trades |
|---|---|---|
| Waterproofing internal 90° corners | Ensures a seamless elastic seal and 100% elastic recovery for long-term protection against water ingress. | Waterproofers, Tilers |
| Waterproofing external 270° corners | Provides high strength and tear resistance at critical, volatile corner intersections. | Waterproofers, Builders |
Ensure substrate is clean, dry, and structurally sound. Remove dust, debris, oils, and loose materials. Check substrate suitability and adhesion of associated products before starting.
Use a stiff brush or vacuum to remove dust. Wipe with a damp cloth if required and allow to dry fully before membrane application.
Perform a small-area adhesion test with the chosen Gripset membrane to confirm compatibility and bond strength before large-scale application.
Apply a liberal, even coat of the selected Gripset membrane to the substrate at the corner location, covering 100% of the rear profile area.
Work membrane into the substrate with a brush to achieve full wetting. Apply thick enough to maintain a wet film until the corner is embedded.
Spread evenly with a roller or notched trowel to the recommended membrane thickness, ensuring no gaps or thin spots.
Position the Elastoproof corner into the wet membrane bed. Fully wet out fabric edges and press firmly to ensure adhesion without voids.
Smooth from the centre outwards to remove air pockets and creases. Work membrane through the fabric edges to ensure full contact.
Brush membrane over the corner face and onto the adjacent substrate to seal fibres and create a continuous barrier.
Overlap Elastoproof Jointing Bands by at least 40mm onto the corner piece using the same Gripset membrane for adhesion.
Apply membrane to the joint area, lay banding over the corner with the correct overlap, and press to integrate with the corner fabric.
Coat over the seam and corner face to create a continuous, watertight finish.
This product is not classified as hazardous according to Worksafe Australia criteria.
Store in original packaging. Dispose of in accordance with local, state, and federal regulations. Avoid contaminating waterways and sewers during disposal.
Proper surface and membrane preparation are critical for the long-term performance of corner details.
Surface prep: Ensure the surface is clean, dry, and stable, ready for the specific Gripset membrane application. Adhesion testing over a typical area is recommended before full application.
Primer: Follow the primer requirements for the specific Gripset membrane being used. The corner itself must be embedded into a wet film of the membrane.
| Property | Value |
|---|---|
| Product Family | Elastoproof Detailing System |
| Base Chemistry | NBR (Nitrile Butadiene Rubber) - Cured |
| Appearance | Rubber solid, Grey |
| Specific Gravity | 1.2 |
| Solubility in Water | Insoluble |
| Stability | Considered Stable |
| Hazardous Polymerisation | Will not occur |
| Materials to Avoid | Strong oxidising agents and bases, extreme heat, Solvent-based materials |
| Application Temperature Range | 5°C to 30°C (surface temperature) |
| Internal 90° Corner Dimensions | 200mm x 200mm with 120mm wall/floor returns |
| External 270° Corner Dimensions | 200mm x 200mm with 120mm wall/floor returns |
Here are some common examples on where Gripset Elastoproof Prefabricated Corners used by our customers.
