a. The minimum internal floor area and minimum internal volume of a SS or S/C SS shall be based on gross floor area (GFA) of dwelling unit and nominal occupancy of dwelling unit in accordance with TABLE 2.2.1.

b. The maximum internal floor area of a SS or S/C SS shall be 32m².

c. For the S/C SS, the aggregate planar area of the staircase entrance landing, intermediate landing and the staircase treads (excluding the over-lapping tread at each riser and area taken up by the internal SS door) of each storey is taken as its internal floor area.

d. The product of the internal floor area of the S/C SS and its clear height, measured from the finished floor level (FFL) to the soffit of the ceiling staircase slab, is taken as the internal volume of the S/C SS.

e. The maximum internal length of any floor and roof slab of a SS shall be 10000mm. The minimum internal width of a SS or S/C SS shall be 1200mm. Refer to FIGURE 2.2.1(a) and 2.2.1(b).

f. For S/C SS, the minimum internal width of staircase flight shall be at least 1150mm. See FIGURE 2.12.1(f).

Figures & Tables

FIGURE 2.12.1(f): TYPICAL PLAN OF S/C SS COMPARTMENT

g. The ratio of the internal length to the internal width shall not exceed 3:1.

a. The minimum SS clear height shall be 2400mm. Refer to FIGURE 2.2.1(a). The minimum NS clear height shall be 2400mm

b. The minimum S/C SS or scissor S/C SS clear height shall be 2400mm. Within the S/C SS or scissor S/C SS tower, where the storey height deviated from the typical storey height, the minimum clear height of NS in S/C SS or scissor S/C tower shall be 2000mm. Refer to FIGURE 2.2.2(a).

Figures & Tables

FIGURE 2.2.2(a): SECTION OF S/C SS TOWER SHOWING S/C SS AND NS CLEAR HEIGHT

c. The maximum clear height of a SS, S/C SS, scissor S/C SS and NS shall be 3900mm. Refer to FIGURE 2.2.1(a), 2.2.2(a) and TABLE 2.3.1.