By using cold process, all the hazards of the kettle-heated asphalts are eliminated: no fires, limited fumes and odors, and no skin and muscle burns.
Some 30 years ago, cold process waterproofing mastics and adhesives were developed and offered to the commercial roofing marketplace.
Again, using felts or layers, the traditional built-up roofs could now be installed using cold process bitumen instead of the hot kettle fired bitumen. These cold process products were solvent-based and acted as the bonding glue and waterproofing of the built-up roof system. Over the years, the cold process materials have been enhanced via new asphalt polymer chemistry. Therefore, cold process materials now are available in economy grades up to high-performing rubberized versions meeting demands of 21st century light-weight roofing construction.