Knauf Waterproofing Muscle is a high quality insulation element designed to ensure 140x140 mm for internal angle - bathroom, kitchen, shower cabin and other wet areas. This cuff made of elastic and firm material prevents water leaking with perfectly adaptation with hydroisolation covers. Thanks to sizes, installation is easy and provides maximum protection in corner areas. It is steady for longevity, moisture, mildew and temperature changes, but also ideal for use in new buildings and repair work.