A linear drain allows for the use of larger format floor tile and the ability to pitch the floor in one direction. This offers an advantage from the traditional center drain installation, where the floor must slope in four directions in order to properly drain the water.Common Methods Using a Clamp Down Floor Drain PVC Membrane/Vinyl Liner (Polyvinyl Chloride)A plastic sheet available at most plumbing suppliers and sold in rolls of 4’, 5’ and 6’. The membrane is layered between mortar beds …