The brand name Transite sold asbestos containing siding that has a unique and distinctive appearance and texture. This cement-based product is very rigid and non-friable building material that was used from 1929 up until the 1980’s when it was phased out after the hazards of asbestos became apparent. The use of asbestos provided tensile strength and heat resistance, it was inexpensive and widely mined in places like Montana and Quebec. Modern Transite products do not contain any asbestos. Use qualified professionals to properly identify and remove asbestos siding these products.