The wedi Corner Putty Knife is a must-have tool for any professional or DIY installer working with wedi waterproofing systems. Specially engineered for forming clean, seamless 90-degree inside corners between wedi building panels, this lightweight plastic tool helps ensure every joint is watertight, smooth, and ready for tile.

Designed to work in tandem with wedi Joint Sealant, the putty knife glides effortlessly over foam panels to create crisp seams in wet room areas like showers, steam rooms, and tub surrounds. Its compact form fits easily into corners without damaging the surrounding panel structure, while the ergonomic shape makes sealant application fast, consistent, and mess-free.

Unlike makeshift tools or metal putty knives that can gouge the panel surface, the wedi Corner Putty Knife is purpose-built for wedi installations and offers superior control with less cleanup. Use it when building curbless showers, niches, benches, or sealing wall-to-floor transitions—this tool streamlines waterproofing for a more professional finish.

Ideal for use in residential, commercial, and ADA-compliant wet room construction, the wedi Corner Putty Knife is reusable, easy to clean, and essential for forming a long-lasting waterproof seal in every wedi install.

wedi is a family-owned German company that invented the original wedi Building Panel in 1983—the first inherently waterproof tile backer board. Today, wedi engineers complete waterproof shower and wet-room systems, including building panels, shower bases with integrated drainage, niches, curbs, sealants, and accessories designed to work together as a modular system. wedi manufactures in Germany and Batavia, Illinois, and backs its systems with a 10-year warranty (with longer coverage available for registered projects installed by wedi PRO certified installers).