CERTA The CERTA training program is ideal for contractors whose work involves torch applications. The full day program trains experienced roof system installers on the safe use of roofing torches used to apply polymer modified bitumen roofing products..The torch on roof, also known as the torch down roof, is one of the common roofing types used on flat roofs. When installed correctly, it can last from years..Description. Introducing the CXS Series of durable Head Torches from Coleman! The CXS is a lumen head torch utilising innovative REAX Auto Adjusting Technology, for best performance the torch’s beam pattern is able to change depending on your surroundings and your needs!.How to Install Torch Down Roofing. Torch down roofing is a type of roofing that consists of levels of modified bitumen similar to asphalt heat adhered to layers of fibergl .