AUST – HENDRY building surveyors advise that the Building Code of Australia (BCA) in Part C2 ‘Compartmentation and Separation’ contains clause C2.3 ‘Large isolated buildings’. A number of designs provided to HENDRY building surveyors are incorrect and designers appear to need help in the explanation of this clause relative to distances and envelope shape.

Building Code of Australia: Clause C2.3 – Issue

Construction of an oversized building, what are the set back distances?

Building Code of Australia: Clause C2.3 – Explanation

Where a Class 5 to 9 building exceeds its fire compartment limit, it must have a sprinkler protection system and be provided with perimeter emergency vehicle access. For a Class 7 and 8 building that is not sprinkler protected, the building can be constructed as follows:

  • 18m of perimeter open space of which 6m minimum continuous emergency vehicular access must be provided within; and
  •  Automatic fire detection and alarm system to AS 1670.1 and monitored; or
  • Automatic smoke exhaust system to Specification E2.2b; or
  • Automatic smoke and heat vents to Specification E2.2c; or
  • Natural smoke venting at 1.5% of the floor area.

Note: An excess hazard process and storage provision will cause the building to be sprinkler protected in any case.

The following illustration from BCA Illustrated depicts the set back requirements under Clause C2.3 Large Isolated Buildings.

BCA Illustrated

BCA Illustrated contains 112 illustrations (each containing an issue, explanation, references and an illustration) in Part C2 – Compartmentation and Separation (fire compartmentation)

Building Legislation Table

Refer to our Building Legislation table for further information on the building compliance process including as built drawings.

Fire Safety Compliance: Essential Safety Measures

Refer to our Essential Safety Measures Identification Table for further information on individual essential safety measures including a full function fire test.

Further Advice

For consultancy advice please contact our closest HENDRY Building Surveying Consultants office in your state click here.