Schluter Kerdi-Kereck Inside Corner 90° Preformed Waterproofing – 10 Pack | KERECK/FI10

Overview

The Schluter Kerdi-Kereck inside corner is a purpose-built, preformed element designed to deliver a clean, continuous waterproof transition at 90-degree shower junctions. Engineered to integrate with the Schluter Shower System, it helps streamline installation and reduce the risk of uneven edges where tiles meet the shower pan and walls.

Each piece is shaped for a precise fit, ensuring a robust, water-tight seal at inside corners. The ultra-thin 4-mil profile minimizes tile buildup in tight junctions, helping you maintain a flat, uniform surface for tile setting. When paired with compatible Schluter components, Kerdi-Kereck contributes to a cohesive waterproofing strategy across the entire shower enclosure.

In real-world use, installers report that the preformed corner simplifies alignment, speeds up workflows, and creates predictable corners that tile neatly against. The product is suitable for 90-degree configurations and can adapt to varying shower layouts, alcoves, and niche designs, reducing the need for improvised patches or cut corners.

Key benefits

• Preformed precision shapes that align with inside corner junctions for a reliable seal.
• 90-degree versatility makes it compatible with common shower layouts.
• Ultra-thin 4-mil thickness minimizes buildup and preserves a flat tiling surface.
• Full compatibility with Schluter Shower System products for integrated protection.
• 10-year limited warranty when installed per the Schluter Installation Handbook and Technical Data Sheet.

Installation and use cases

Best practices emphasize following the installation guidelines to maximize performance. Ensure clean, dry substrates, proper bonding, and correct placement before tile setting. This approach helps maintain long-term protection against water intrusion while supporting a durable finish for years to come.

The Kerdi-Kereck piece is a practical choice for renovators and builders focused on consistent results, efficient workflows, and dependable performance in wet environments. While results depend on correct installation and site conditions, the product offers a clear pathway toward a professional, seamless interior corner solution that fits within Schluter's broader waterproofing ecosystem.