Schluter-KERDI-KERECK-F is a pliable waterproofing membrane strip designed to waterproof corners in bath and shower installations. It is covered in an anchoring fleece on both sides, allowing it to be set in place with thin-set mortar. Product Features Vapor Retardant The Schluter-KERDI waterproofing membrane has a very low water vapor permeance, making it an excellent waterproofing membrane for shower, bath, and steam room installations. Shaped to Corners The Schluter-KERDI-KERECK-F waterproofing membrane fits seamlessly into corners, eliminating the need to cut standard KERDI membrane to fit tedious areas.