18.104.22.168.2 Horizontal Openings in Rooftops
(a) The pedestrian path on a rooftop, when the door or cover is open, shall be such that it permits a minimum 1200 mm (48 in.) wide unobstructed path that is not normally accessible to vehicular traffic.
(b) Hoistways shall not be located either wholly or partially in front of any entrance to a building or openable window.
(c) The side of the door opening nearest to any building wall or other obstruction shall be 100 mm (4 in.) or less, or greater than 900 mm (36 in.), from the wall or obstruction.
(d) Horizontal openings in rooftops shall be protected by hinged metal doors or vertically lifting covers having a nonslip upper surface. Doors or covers shall be of sufficient strength to safely support a static load of not less than 14.4 kPa (300 lbf/ft2), uniformly distributed.
(e) When in the closed position, doors shall be flush with the landing sill.
(g) All openings between rooftop door panels and frames shall be provided with minimum 50 mm (2 in.) gutters to collect rainwater. The gutters shall be piped rigidly to a discharge point exterior to the hoistway and pit.