Here is a scenario facing a design practitioner needing clarity from a compliance practitioner: The bedroom is one of three in a dwelling proposed to be located in the 3rd storey of a building having a rise in the storeys of three.

The building will contain Class 7a car parking on the ground floor and Class 2 residential on the upper two storeys and will be Type A fire resisting construction (Section C, Volume One).

It is clear that the ceiling shown in the image above is sloping, and that the room or space is an attic, which means that the DTS Provisions in F3.1 can apply for the ceiling.

If using DTS Provision F3.1 for compliance, it requires the height to be not less than 2.2 m for not less than two-thirds of the floor area of the room or space.

It also states that when calculating the floor area of a room or space, any part that has a ceiling height of less than 1.5 m is not included.

In light of that, what are the next steps when the designer is unable to make the sloped ceiling comply with the DTS Solution? Is a Performance Solution the way to go?

NCC CPD course on Performance Solutions can help to refresh your knowledge of this and other Performance Solutions related questions.  The course covers the four-step process for creating and documenting Performance Solutions introduced in NCC 2019 Amendment 1, which will come into effect 1 July 2021. It will also provide an overview of how a Performance Based Design Brief (PBDB) should be developed and tailored to a specific project’s needs.

Developed by the Australian Building Codes Board (ABCB) with industry and subject matter experts, this 1.5hr online course is available now.

Find out more.