The prominent underground structures around the globe require a proficient and economical waterproofing solution to resist any unintended entry of water or moisture into the underground structure, irrespective of it is a basement or a pit for equipments. Basements are immersed in differing levels of groundwater, and aggressive influences including damp soil contact, percolating water, water under hydrostatic pressure plus aggressive chemicals in solution, different soil, gravel and rock, etc. These all require different and often specific waterproofing treatments to be applied to the structure. The technologies and systems used in this arena are generally fully adhered FPO membranes (SikaProof A+), PVC based membrane systems (Sikaplan), 2ply (layer) modified bitumen membranes (SikaBit T) and single ply bitumen membranes (SikaBit T). Various sections below would outline one of these technologies which is based on modified bitumen membrane based on atactic polypropylene polymer generally called as APP membranes.