Mar 30, 2019 · Specifications of HDPE Waterproofing Membrane for Landfill Project in Philippines. Bottom Lining System Thickness: 2.0 mm HDPE Geomembrane Liner. Landfill Caps Thickness: 1.5 mm HDPE Geomembrane Liner. Total quantity: 80,000 square meters. Roll Size: 7m*100m.