Pre-Pitch is a unique, stay in place screeding tool designed for use underneath shower pan liners. Pre-Pitch creates the proper sub floor pitch needed to manipulate water flow towards the weep holes that are an integral part of shower floor drains. By having a pitch under the pan liner, water that passes through the mud bed is now directed to the weep holes instead of being trapped between the mud bed and the liner. This "ponding" or collection of water is where many mold and mildew related issues originate.