These are fire escapes with supporting structure made by 2, 4 or 6 hot sectional steel HEA columns. These hot galvanized (UNI 5744/66) sections are of the opportune size and are fixed on the foundation with plates and lag bolts. The hot sectional steel thigh straps are made with FeE 320 hot galvanized steel cold sections according to the Sendzimir method (UNI 5753/84). This hot sectional steels have an hardened section with continuous sequence of profiling and are cut by shearing and pierced in line with punching and then are fixed in the structure with 8.8 class bolting (UNI EN 20898/1). The grilled slip steps and landings 15*76 have 25 mm of thickness. Parapet with a minimum of height of 1000 mm are made by double little jambs and two hollow profiled rectangular parallel. The structure is made moreover of a bent skirting and of a tubular handrail which have a thickness of 42 mm that is assembled with bolting and plates on the thigh straps.