Adjoining Building (Fire Separation) Building Codes & Rules

Masonry Veneer Exterior Wall^{NCC 2022 HP, 9.3.1 (4)}

• ≤ 50mm gap between separating wall & masonry veneer
• Fill gap with Fire-resistant materials for weatherproofing

Combustible Roof Light^{NCC 2022 HP, 9.3.3 (a)}

• ≤ 20% of total roof area
• Must have non-combustible cover

Class 10a Private Garage not associated with Dwelling 3

≥ 900^{NCC 2022 HP, 9.3.3 (b)}

≥ 450^{NCC 2022 HP, 9.3.1 (1) (c) (ii)}

B

Dwelling Overhang

Dwelling 1

Dwelling 2

Dwelling 2

Dwelling 2

≥ 60/60/60 FRL^{NCC 2022 HP, 9.3.1 (1) (a) (i)}

B

A

Dwelling 3 Open Space

Dwelling 2 Open Space

Non-combustible Partition^{NCC 2022 HP, 9.3.1 (5)}

• Separation of two dwellings with common eaves or verandah space to have either
• [A] Partition installed on common eaves or verandah space or,
• [B] Partition in between the Class 1 dwelling & the common eaves or verandah space
• Installed on one side of roof support

Dwelling 3

Dwelling 3

Horizontal Projection

• 1.8m Fire Resistance Area on each side of Separating Wall^{NCC 2022 HP, 9.3.4 (1)}
• ≥ 60 minutes Fire Resistance duration of Floor, Soffit or Ceiling
• ≥ 30/30/30 FRL
• Extended part of Separating Wall must have^{NCC 2022 HP, 9.3.4 (2)}
• Fire-resistant material between gaps of wall base and soffit or floor
• ≤ 75 x 50mm Timber framing, or
• Sarking

1.8m^{NCC 2022 HP, 9.3.4 (1)}

Internal Structure

Masonry Veneer

Class 10a Private Garage Requirements

• Wall Fire Separation^{NCC 2022 HP, 9.4.1}
• ≥ 60/60/60 FRL
• ≥ 90mm Masonry Construction
• From Footing or Ground Slab
• Extend to underside of Separating Floor
• Floor Fire Separation^{NCC 2022 HP, 9.4.2}
• ≥ 30/30/30 FRL
• ≥ 60 minutes Fire Resistance duration
• If floor is combustible or metal, provide Fire-protective covering to underside of the floor & beams

Wall extension for Combustible Roof Covering

Class 1

Non-combustible Roof Cover

Fire Separating Walls

• Wall separation between Class 1 dwellings & Class 10a^[1]

Fire Separating Wall Construction

NCC 2022 V1

NCC 2022 HP, 9.3.1 (3)

NCC 2022 HP, 9.3.1 (1) (c) (ii)

NCC 2022 HP, 9.3.1 (1)

NCC 2022 HP, 9.3.1 (1)