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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 2.8 NS in HS Tower

TRHS 2023

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2.8.1 Aggregate Wall Heights of NS

a. Several NS can be stacked one on top of the other within an HS tower, without the need for NS floor slab to be connected to external floor slab, provided that the aggregate wall height of the NS does not exceed 12m. See FIGURE 2.8.1(a).

b. Aggregate wall height of NS refers to the sum of the height(s) of NS between two levels of the HS tower where the full external perimeters of the HS tower at those levels are structurally connected by floor slabs or tie beams to the structural frame of the building. The tie beams shall be designed with at least equivalent stiffness to the floor slab.

c. The minimum thickness of the intermediate slabs between 2 NS shall be 175mm.

2.8.2 Shielded and Unshielded NS Walls/Columns

The relevant architectural technical requirements of the shielded and unshielded NS Columns/ Walls as stipulated in Clause 3.3 shall be complied with.