Class 9b buildings are typically buildings considered assembly buildings. These include public halls, theatres, churches, schools, clubs, nightclubs, sporting complexes and transport buildings.
Sound transmission and Insulation
The objective of providing insulation to reduce sound transmission is to prevent loss of amenity due to undue sound being transmitted between accommodation units, or to a unit from other parts of the building such as plant rooms, lift shaft, common corridors, or from a different classification in the same building for example, car park, shops, commercial premises.
Building requirements
As Class 9b buildings do not contain accommodation, the acoustic requirements of Part F5 of the BCA do not apply unless the Class 9b portion adjoins one of the following building classifications within the same building:
- Class 2 – residential units
- Class 3 - boarding houses, motels and residential parts of hotels
- Class 9c – aged care buildings
Should a class 9b building share a wall, floor or ceiling with one of the above building classifications, the corresponding acoustic requirements for the adjoining classification should be used in designing that building element.
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