In general, the construction of the geotechnical membrane is mainly by welding, and the lap?width is confined to the requirements of the specification. According to the requirements of "the lap width of the sanitary landfill field seepage systems engineering and technical specifications CJJ113-2007 ", lap?width of geomembrane: sweat soldering: 100±20（mm） squeezing welding 75±20(mm). According to our factory's experience, in general, the overlap loss of the geomembrane is between the 5%-8%, that is, for each1000 square meters of geomembrane, the loss is 80 square meters to 50 square meters. Construction site whose environment is relatively simple can calculate the loss according to 5%, complex construction site can calculate the loss according to 8%.
