Recommended Add-Ons
At a Glance
Why Choose This Product
Eliminates field-folding membrane at 90° corner transitions
Protects internal and external corners throughout the waterproofing assembly
Reinforces critical changes of plane to help prevent moisture intrusion
Integrates with GURU WATER-STOP membrane systems
Suitable for showers, wet rooms, balconies, terraces, and other tiled areas
Meets ANSI A118.10 and ANSI A118.12 requirements
Product Information
GURU® Water-Stop Corners reinforce the vulnerable 90° transitions where waterproofing membranes can be difficult to form consistently. These pre-formed waterproofing corners create dependable coverage at shower and wet-area corners, helping maintain a continuous waterproof barrier beneath tile without folding flat membrane material on site.
Inside corners are shaped for recessed wall-to-wall and wall-to-floor junctions, while outside corners protect projecting 90° edges. Each option is made from flexible 20 mil WATER-STOP membrane material, allowing it to conform closely to the transition and integrate with the surrounding waterproofing system.
Designed for residential and commercial waterproofing, these shower waterproofing corners help protect changes of plane in showers, steam showers, wet rooms, balconies, terraces, and other tiled areas. Their ready-shaped construction saves time, supports consistent coverage, and meets ANSI A118.10 and ANSI A118.12 requirements.
Common Questions
GURU Water-Stop Corners reinforce 90° changes of plane where waterproofing membranes meet at inside or outside corners. Their pre-formed shape helps maintain continuous waterproof protection beneath tile while eliminating the need to cut and fold flat membrane material around difficult shower and wet-area transitions.
Inside corners are shaped for internal 90° junctions, such as wall-to-wall or wall-to-floor connections. Outside corners are formed for projecting 90° edges. Selecting the configuration that matches the corner allows the accessory to sit correctly and integrate smoothly with the surrounding WATER-STOP membrane.
No. These waterproofing corners arrive pre-formed for their intended 90° transition, so installers do not need to create a corner by folding a flat membrane sheet. The ready-shaped design helps produce consistent coverage at a detail that can otherwise be difficult to waterproof cleanly.
GURU Water-Stop Corners are designed to integrate with GURU WATER-STOP bonded waterproofing membrane systems. They use compatible membrane construction to reinforce the corner while connecting with the surrounding sheet membrane. Follow GURU’s current system instructions and use the specified bonding material for the complete assembly.
The corners are bonded at the required transition with the thin-set mortar specified for the WATER-STOP system. The substrate should be properly prepared, and the corner should receive complete contact without trapped air or gaps. Follow GURU’s current instructions for membrane overlap, bonding, and curing before installing tile.
Water-Stop Corners can be used at appropriate 90° transitions in showers, steam showers, bathrooms, wet rooms, balconies, terraces, and other tiled waterproofing applications. They are suitable for residential and commercial projects and may be incorporated into approved interior or exterior WATER-STOP assemblies.
The corners are manufactured from flexible, multilayer WATER-STOP membrane material with an approximate thickness of 20 mils. This construction allows each pre-formed corner to conform to its intended transition while providing the waterproofness, low permeability, and bonding surface needed within the surrounding membrane assembly.
GURU identifies W-S DIN and W-S DEX corners as compliant with ANSI A118.10 and ANSI A118.12 requirements. The technical data also references the TCNA Handbook, Uniform Plumbing Code, and National Plumbing Code of Canada. Always confirm current local code requirements and follow the latest GURU installation instructions.
