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Clause 2.1 HS or NS Form Clause 2.2 Size of HS Clause 2.3 Wall and Slab Thickness of HS and NS Clause 2.4 Location of HS Clause 2.5 HS Door Clause 2.6 Precast Hollow Core Household Shelters (Precast HS) Clause 2.7 Fixtures in HS Clause 2.8 NS in HS Tower Clause 2.9 Transfer Structure Supporting HS Tower Clause 2.10 HS Beneath An Internal Staircase Clause 2.11 Finishes in HS Clause 2.12 Exit Staircase Clause 2.13 Door Recess on HS Wall

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Clause 2.10 HS Beneath An Internal Staircase

TRHS 2023

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If a HS is located beneath an internal staircase, the following requirements shall apply. See Figure 2.10.

a. For the purpose of determining the minimum internal floor area of the HS in accordance with TABLE 2.2.1 (b) and TABLE 2.2.1 (c), only the portion of the space with clear height of at least 1500mm shall be taken into account.

b. For the purpose of determining the minimum internal volume of the HS in accordance with TABLE 2.2.1 (b) and TABLE 2.2.1 (c), the entire enclosed space may be used.

c. The minimum thickness of the HS ceiling slab and waist of the staircase shall be 300mm.

d. The minimum unobstructed distance from the HS wall with ventilation sleeve opening to the nearest face of any other internal structural element shall be at least 700mm. This is to facilitate the installation of a gas filtration unit when required during a National Emergency.