H ( homogeneous polyvinyl chloride plastic waterproofing sheets ) is the principal material used on exposed roof applications, in vacuum or mechanically attached systems. These roofing systems are suitable for new build and refurbishment applications, flat and pitched roofs. It is reliable, and convenient for construction. L ( polyvinyl chloride plastic waterproofing sheets backed with fabric ) is manufactured from pliable PVC with a reinforcement of nonwoven polyester. The PVC contains stabilizers, which make the product resistant to high and low temperatures, UV-resistant and makes it flame retardant. P (polyvinyl chloride plastic waterproofing sheets internally reinforced with fabric ) is a with a laminated polyester fleece (or glass fiber fleece) on its interlayer and can be installed directly on old roofing underlay. We recommend that all roofs have an inclination of minimum 1:40 to provide positive drainage. G Polyvinyl chloride plastic waterproofing sheets internally reinforced with glass fiber.Add the Short cut glass fiberor Glass fiber nonwoven fabrics in the sheet, on the mechanical properties such as tensile properties had no significant effect, only improve dimensional stability. GL Polyvinyl chloride plastic waterproofing sheets internally reinforced with glass fibers and backed with fabric.Add the Short cut glass fiber or Glass fiber non-woven fabrics in the sheet, and non-woven fabrics such as polyester composite membrane under the polyvinyl chloride plastic waterproofing sheet surface.