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3.10 EXIT STAIRCASES
3.10.1 Non-combustibility of structure
Every exit staircase, including the treads/ risers and landing, shall be constructed of non-combustible materials.
3.10.2 Structure separating exit staircase
The exit staircase shall be separated from other parts of the station by a masonry structure or dry wall complying with Cl.3.8.7c.. which shall have fire resistance for not less than the period required by Cl.3.3 for Fire Resistance Elements of Structure.
3.10.3 Exit doors
Doors opening into the exit staircase shall have fire resistance of at least ½-hr and fitted with automatic self-closing device.
3.10.4 Finishes
Finishes to the ceilings/ walls and floors of exit staircase shall be of non-combustible materials.