Schluter Inside/outside corners orcasupply 7 years ago Schluter®-KERDI-KERECK/-KERS-B are preformed, seamless corners made for waterproofing inside and outside corners of KERDI, KERDI-BOARD, and DITRA assemblies to prevent leaks and mold-growth. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook