Four big advantages about using plastic tubes are: step security, less thermal bridges, the price and the fact that you can recycle them.
Guardian tubes can be used in combination with bituminous and synthetic roofing systems. High performance tube RB 48 is specially designed for synthetic roofing systems, with unique high design load values. High performance tube RBS 50 is specially designed for bituminous roofing systems, also with unique high design load values.
Guardian tubes are available separately or in combination with screws / fasteners, what you prefer. Guardian tubes can be applied on steel decks, concrete roofs, light weight concrete and wooden roof constructions. Telescopic tube ASTL is specialy designed for fastening of tapered insulation.