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Elevated Floors/Sub-floors – Enclosed

Where the sub-floor frame is enclosed by an external wall down to ground level, no additional requirements apply for the floor system as long as the construction of the wall system complies with AS 3959 for timber framing or Section 3 of NASH STANDARD Steel Framed Construction in Bushfire Areas – 2014 for steel framing .
Ventilation must be provided in accordance with the NCC for your specific climate zone. If the allocated ventilation is more than 10 times the minimum required, the subfloor is considered to be unenclosed and should be designed as such.

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