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The National Construction Code (NCC) sets out that an external wall of a Class 1 building, and any openings in that wall, must comply with Clause 126.96.36.199, if the wall is less than:
The distance from any point on an external wall of a building to an allotment boundary or another building is the distance to that point measured along a line at right angles from the allotment boundary or external wall of the other building.
Only that part of the wall (parallel to the allotment boundary or another building including any openings) within the specified limits above needs to be constructed to comply with Clause 188.8.131.52. No protection is required for a wall at right angle or more to the boundary which is creating the potential fire source.
External walls (including gables) that are required to be fire-resisting (as determined from the above section) must extend to the underside of a non-combustible roof covering or non-combustible eaves lining and must:
Any openings in external walls required to be fire-resisting must be protected by:
Sub-floor vents, roof vents, weep holes, control joints, construction joints and penetrations for pipes, conduits and the like must also comply with the openings requirements above.
There are some concessions available for non-habitable room windows and also separate provisions for carports in certain circumstances .
These fire-resisting walls must commence from the footings or ground slabs, and extend:
*Fire-Resistance Level (FRL) is denoted with three figures – for example, FRL 60/60/60. The first figure denotes a ‘structural adequacy’ period of 60 minutes; the second figure denotes an ‘integrity’ period of 60 minutes; and the third figure denotes an ‘insulation’ period of 60 minutes. A dash indicates that there is no requirement for that criterion such as -/60/- where the criterion is 60 minutes for integrity only.
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