One way of ensuring reliable waterproofing in shower areas, especially in the corners of KERDI-SHOWER, is by adding a KERDI product. KERDI-KERS is a completely seam sealed, prefabricated part for installation on both the left and right side. This clever prefabricated internal corner is available to order in 20 mm and 28 mm heights for uniform waterproofing of showers with side lengths from 80 to 110 cm (KERDI-KERS 20) and from 110 to 150 cm (KERDI-KERS 28).