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Walking along the glass floor of the CN Tower: 342 m/1,122 ft up. The glass floor has an area of 24 square metres (258 sq ft) and can withstand a pressure of 4,100 kilopascals (595 psi). It is designed to bear 5x the standard commercial floor. The floor's thermal glass units are 64 millimetres (2.5 in) thick, consisting of a pane of 25-millimetre (1.0 in) laminated glass, 25 millimetres (1.0 in) airspace and a pane of 13-millimetre (0.5 in) laminated glass. http://en.wikipedia.org/wiki/CN_Tower http://www.cntower.ca