Gripset Elastoproof Prefabricated Corners

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.

How it works

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.

Compatibility and limitations

• Not compatible with solvent-based materials, including solvent-based adhesives, sealants, or coatings.
• Do not apply when the surface temperature is below 5°C or above 30°C.
• Compatible with all Gripset water-based membranes.

Sizing and packaging

• Internal 90º corners (CN90): 200mm x 200mm with 120mm wall/floor returns
• External 270º corners (CN270): 200mm x 200mm with 120mm wall/floor returns

Installation requirements

To ensure a secure bond and maintain system integrity, installers must adhere to the following sequence:

• Apply a liberal coat of the selected Gripset membrane to the substrate, ensuring full coverage to receive 100% of the rear corner profile.
• Embed the corner profile directly into the wet membrane bed. The fabric edges must be wetted through completely. Do not allow the membrane to skin or dry before bedding the corner.
• Use a flat spatula or brush to smooth out all creases and push out any trapped air pockets behind the fabric edges. Under-applying the membrane behind the corner will prevent proper adhesion.
• Remove excess membrane from the top surface by brushing it over the face or onto the adjacent wall and floor surfaces.
• Overlap and adhere connecting lengths of Elastoproof Jointing Bands a minimum of 40mm onto the prefabricated corner sections using the wet membrane.