NCC 2022 Volume Two - Building Code of Australia Class 1 and 10 buildings
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H7
Part H7 Ancillary provisions and additional construction requirementsThis Part contains requirements which operate alongside the requirements of other Parts of NCC Volume Two, to address specific types of ancillary structures such as swimming pools, heating appliances and fireplaces, and private bushfire shelters. This Part also includes additional requirements for construction in alpine areas and designated bushfire prone areas.
The Objective is to—
A swimming pool is to be provided with—
H7F1 only applies to a swimming pool with a depth of water more than 300 mm.
A heating appliance using controlled combustion located in a building is to be installed in a way which reduces the likelihood of—
A building in an alpine area is to be provided with additional measures in view of the increased difficulties in fighting fire and maintaining access and means of egress in snow conditions.
A Class 1 building or a Class 10a building or deck associated with a Class 1 building constructed in a designated bushfire prone area is to provide resistance to bushfires in order to reduce the danger to life and reduce the risk of the loss of the building.
A structure designed for emergency occupation during a bushfire event must provide shelter to occupants from direct and indirect actions of a bushfire.
H7F5 only applies to a Class 10c building.
A barrier must be provided to a swimming pool and must—
H7P1 only applies to a swimming pool with a depth of water more than 300 mm, in conjunction with the Swimming Pools Act 1992 and the Swimming Pools Regulation 2018.
H7P1 only applies to a swimming pool with a depth of water more than 300 mm.
TAS H7P2(1) only applies to a swimming pool with a depth of water more than 300 mm.
TAS H7P2(2) does not apply to a swimming pool associated with a Class 1 building if the depth of water is less than 300 mm and the volume of the pool does not exceed 15 m3.
A swimming pool water recirculation system must incorporate safety measures to avoid entrapment of, or injury to, a person.
H7P2 only applies to a swimming pool with a depth of water more than 300 mm.
A heating appliance and its associated components within a building, including an open fire-place, chimney, or the like, must be installed—
A heating appliance and its associated components within a building, including an open fire-place, chimney, or the like, must be installed—
H7P3 is not intended to apply to inserted fireplaces fuelled by gas. Insert gas fireplaces may be regulated by relevant authorities responsible for gas installations in each State or Territory jurisdiction and may be required to comply with AS/NZS 5601 – Gas installations.
A Class 1 building or a Class 10a building or deck associated with a Class 1 building that is constructed in a designated bushfire prone area must, to the degree necessary, be—
For additional requirements relating to bushfire prone areas, refer to the Director’s Determinations on Bushfire Hazard Areas – current versions available at www.cbos.tas.gov.au
A Class 1 building or a Class 10a building or deck associated with a Class 1 building that is constructed in a designated bushfire prone area must be designed and constructed to—
A private bushfire shelter must be designed and constructed to provide a tenable environment for occupants during a design bushfire with an annual probability of exceedance not more than 1:200 years, appropriate to the—
H7P6 only applies to a Class 10c building.
NCC Volume Two and the ABCB Housing Provisions do not contain any Deemed-to-Satisfy Provisions for H7P6, however the ABCB Performance Standard for Private Bushfire Shelters contains guidance for H7P6.
Compliance with H7P3(a) and (b) is verified when—
Under H7V1, it needs to be demonstrated that the proposed appliance will not deteriorate under standard operating conditions. Examples of deterioration may include deformation or failure of components that would render the appliance unsafe to use.
For the purposes of demonstrating compliance with (a), the typical operating temperature of a combustion device can be established by testing.
For the purposes of demonstrating compliance with (b), materials used for building elements (walls, floors and ceiling) in the areas surrounding an appliance can be appropriately selected and/or designed to align with the quantified values as determined by (a). This could either be achieved by using Expert Judgement or by adhering to manufacturer's specifications. Certification in accordance with CodeMark Australia would also be a possibility in demonstrating compliance using the Verification Method.
Full range of thermal movements relates to both the appliance and materials when exposed to both the heated and ambient conditions.
Benefits to industry derived from the application of this Verification Method includes the potential use of non-standard national or internationally manufactured appliances. For example, test reports from appliances complying with various ISO Standards and various British Standards could be used to demonstrate compliance with the Verification Method. The Verification Method also allows for in situ testing of unique combustion appliances, which would not easily be tested in accordance with the Australian Standard. Such testing would need to be verified by a suitably qualified practitioner and be supported by appropriate documentation.
Importance Level | Complex analysis APE for bushfire exposure | Simple analysis APE for weather conditions (design bushfire) |
---|---|---|
1 | No requirement | No requirement |
2 | 1:500 | 1:50 |
3 | N/A for Class 1 and 10 buildings | N/A for Class 1 and 10 buildings |
4 | 1:2000 | 1:200 |
Complex analysis must consider the probability of ignition, fire spread to the urban interface and penetration of the urban interface coincident with fire weather conditions.
NCC Volume Two does not apply to buildings that are Importance Level 3, therefore this Importance Level is not included under (3).
There are no Deemed-to-Satisfy Provisions for H7P6.
NSW H7D2(1) applies in New South Wales to the technical construction requirements for barriers to restrict access to swimming pools, subject to—
The Swimming Pools Act 1992 and the Swimming Pool Regulation 2018, applicable to swimming pools with a depth of water of more than 300 mm, regulate the circumstances in which a barrier is required and prevail in the case of any inconsistency.
Definition of ‘swimming pool’
The NCC definition of swimming pools is specific in including a bathing or wading pool and a spa. The requirements of AS 1926.3 apply to all types of pools defined as swimming pools under the NCC, irrespective of the definition in the Standard.
Water recirculation systems
The swimming pool water recirculation system requirements seek to minimise the risk of entrapment or injury of people using the swimming pool and provide for the safe operation of skimmer boxes and outlet systems.
Additional requirements
In addition to the requirements of this Part, a swimming pool must comply with the structural requirements of other Parts of NCC Volume Two and the ABCB Housing Provisions. The structural requirements refer to the swimming pool being designed and constructed to withstand any combinations of loads and other actions to which it may reasonably be subjected and the structural resistance of the materials and forms of construction used in the swimming pool.
Cross-volume considerations
Part C2 of NCC Volume Three sets out the requirements for pumped discharge from swimming pools.
Restriction of access to swimming pools in Queensland is regulated under the Building Act 1975.
Restriction of access to swimming pools in the Northern Territory is regulated under the Swimming Pool Safety Act.
The NCC definition of swimming pool is specific in including a bathing or wading pool and a spa. The requirements of AS 1926.3 apply to all types of pools defined as swimming pools under the NCC, irrespective of the definition in the Standard.
The swimming pool water recirculation system requirements seek to minimise the risk of entrapment or injury of people using the swimming pool and provide for the safe operation of skimmer boxes and outlet systems.
Part 13.7 of the ABCB Housing Provisions contains requirements for swimming pool and spa pool heating and pumping. In specific circumstances, Part 13.7 requires a swimming pool or spa pool to have a cover to reduce evaporation and subsequent heat loss, and time switches to control the operation of the heater.
In addition to the requirements of this Part, a swimming pool must comply with the structural requirements of other Parts of NCC Volume Two and the ABCB Housing Provisions. The structural requirements refer to the swimming pool being designed and constructed to withstand any combinations of loads and other actions to which it may reasonably be subjected and the structural resistance of the materials and forms of construction used in the swimming pool.
Part C2 of NCC Volume Three sets out the requirements for pumped discharge from swimming pools.
In New South Wales, buildings subject to BAL-FZ must comply with specific conditions of development consent for construction at this level.
Performance RequirementH7P3 is satisfied for a heating appliance if it is installed in accordance with—
H7D5 applies to three types of heating appliances and includes the following:
The requirements of both H7D5(a) and Part 12.4 of the ABCB Housing Provisions are intended to ensure the construction or installation of heating appliances can withstand the temperatures they generate. The requirements also ensure there is no spread of fire from within the heating appliance to adjacent building elements.
In addition to this, the requirements ensure hot products of combustion and smoke do not affect the occupants within the building. This is achieved by requiring construction and installation of heating appliances to transfer products of combustion and smoke directly to the outside atmosphere.
Insert fireplaces fuelled by gas are not covered by Part 12.4 of the ABCB Housing Provisions. Insert gas fireplaces may be regulated by relevant authorities responsible for gas installations in each State or Territory jurisdiction and may be required to comply with AS/NZS 5601 – Gas installations.