Part G6 Occupiable outdoor areas
Introduction to this Part
Objectives, Functional Statements and Performance RequirementsThe Objectives and Functional Statements for Part G6 are contained in Sections C, D, E, F and G of this Guide. The Performance Requirements for Part G6 are contained in Sections C, D, E, F and G. Part G6 contains Deemed-to-Satisfy Provisions for occupiable outdoor areas in addition to those contained in Sections C, D, E, F and G.
A number of the Deemed-to-Satisfy Provisions in Part G6 qualify the application of the corresponding Deemed-to-Satisfy Provisions contained in Sections C, D, E, F and G which are considered necessary for occupiable outdoor areas.
Specific comments regarding Specification 5C1.1 (fire-resisting construction provisions) and Specification 20E2.2a (smoke hazard management provisions) are found in those sections of this Guide.
Application of Part
To clarify that Part G6 applies only to buildings containing an occupiable outdoor area and its provisions override Sections C, D, E, F and G of the BCA if there is a difference.
G6D1(1) indicates that the Deemed-to-Satisfy Provisions of Part G6 apply to buildings containing an occupiable outdoor area. These provisions are additional to other Deemed-to-Satisfy Provisions of the BCA that apply to occupiable outdoor areas, for example the relevant provisions of Part D4 relating to access for people with a disability.
G6D1(2) provides a rule for resolving inconsistencies between the requirements in Part G6 and those in the remainder of the BCA, by providing that the Deemed-to-Satisfy Provisions of Part G6 take precedence where there is a difference.
G6D2(3) requires that certain provisions are not applied to private residential balconies or smaller balconies found in commercial buildings.
Fire hazard properties
To specify fire hazard property requirements for an occupiable outdoor area.
G6D2 is included to ensure that materials and assemblies in occupiable outdoor areas restrict the spread of fire and heat to maintain tenability to permit egress. As a result, the fire hazard properties relating to flammability and flame propagation apply to occupiable outdoor spaces.
A concession has been applied to the smoke hazard management requirements of C2D11 because occupiable outdoor spaces, being unenclosed, are unlikely to be affected by a build-up of smoke.
To specify fire-resistance and separation requirements for an occupiable outdoor area.
An occupiable outdoor area may have a different classification to other parts of the building located alongside it or on an adjacent level. Further, an occupiable outdoor area may be fire-separated from other parts of a building. G6D3 therefore applies the requirements of C3D8, C3D9 and C3D10 to occupiable outdoor areas.
Provision for escape
To specify requirements to allow occupants to escape from an occupiable outdoor area in the event of an emergency.
G6D4 is included to ensure that requirements which allow occupants to escape are applied to occupiable outdoor areas as for an internal, occupied part of the building. G6D4 in addition clarifies that a reference to a storey or room includes an occupiable outdoor area. This may require the inclusion of a fire-isolated exit stair for a building that would otherwise not require one if it did not have a rooftop occupiable outdoor area.
This is in recognition that occupants of an occupiable outdoor area are constrained by the building, and therefore require a means of evacuation in an emergency.
Consequently, the provisions from Part D2 as applied under G6D4 are considered the minimum necessary to enable safe egress.
Construction of exits
To specify requirements for the construction of exits in an occupiable outdoor area.
Fire fighting equipment
To specify requirements for fire fighting equipment in an occupiable outdoor area.
G6D6 outlines the appropriate requirements for fire fighting equipment for an occupiable outdoor area and clarifies that a reference to a storey includes an occupiable outdoor area. This is in recognition that an occupiable outdoor area is considered to represent a level of hazard that justifies the installation of fire fighting equipment.
To specify requirements for lift installations in an occupiable outdoor area.
G6D7 outlines that an occupiable outdoor area is considered as a storey for the purposes of Part E3.
This requirement ensures, among other things, that where an emergency lift is installed it serves an occupiable outdoor area.
Visibility in an emergency, exit signs and warning systems
To specify requirements to minimise the risk of death or injury to occupants during an emergency because of
• an inability to see their way along an exit path of travel
• an inability to find an exit; and
• a lack of knowledge that an emergency exists or an evacuation is required.
The effect of G6D8 is to apply the requirements of Part E4 to occupiable outdoor areas as for an internal, occupied part of the building.
Consequently, the provisions from Part E4 as applied under G6D8 are considered the minimum necessary to enable safe evacuation of occupants in case of an emergency.
Light and ventilation
To specify requirements for light and ventilation in an occupiable outdoor area.
There are a wide variety of occupiable outdoor areas. G6D9 is provided in recognition that various occupiable outdoor areas may have periods of occupation that require the provision of artificial lighting.
To enable occupants to evacuate an occupiable outdoor area in an alpine area in an emergency without being impeded by lack of knowledge of the fire safety system, egress routes or evacuation procedures.