Roof Construction BAL-29 Building Codes & Rules

- Comply with Bushfire Construction Requirements with Tools™: BAL-29 requirements, fire danger insights, & detailed guidance for walls, roof, guttering & more!

Eaves Penetrations

Equip with ember guards & seal comprehensively^[1][2][3]

Eaves Penetrations RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

AS 3959:2018, 7.6.6 (d)

AS 3959:2018, 7.6.6 (e)

AS 3959:2018, 7.6.6 (f)

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{AS 3959:2018, 7.6.6 (d)AS 3959:2018, 7.6.6 (e)}
Seal penetrations with non-combustible material^{AS 3959:2018, 7.6.6 (f)}
Equip with ember guards^{NCC 2022 Vol 1, G5D1}
≤ 2mm aperture size
Corrosion-resistant steel, aluminium, or bronze
Comprehensively seal joints with^{NCC 2022 Vol 2, H7D4}
Plastic joining strips, or
Timber storm moulds

AS 3959:2018, 7.6.6 (d)

AS 3959:2018, 7.6.6 (e)

AS 3959:2018, 7.6.6 (f)

Equip with ember guards & seal comprehensively^{AS 3959:2018, 7.6.6 (d)AS 3959:2018, 7.6.6 (e)AS 3959:2018, 7.6.6 (f)}

Sarking

Fascia

Joint Strip

Sarking

Battens

AS 3959:2018, 7.6.5

BAL-29 Certified

Roof Ventilator^{AS 3959:2018, 7.6.5}

Fixings on every corrugation

Turn Sarking into Gutter

Eaves Vent

AS 3959:2018, 7.6.6 (f)

Eaves Lights

Fully Sealed^{AS 3959:2018, 7.6.6 (f)}

Tools™ Best Practice

Fire Resistant Foam Filler Strips^{Tools™ Best Practice}

Provides additional weather & ember protection

Roof Framing

Ridge Capping

Tools™ Best Practice

Fire Resistant Foam Filler Strips^{Tools™ Best Practice}

Provides additional weather & ember protection

AS 3959:2018, H3 (d)

Fixings on every 2nd corrugation^{AS 3959:2018, H3 (d)}

AS 3959:2018, 3.10

≤ 5 Flammability Index^{AS 3959:2018, 3.10}

Mineral Wool Insulation

Fully Sarked

Storm Moulds

Eaves Lining

Tools™ Best Practice

Exhaust^{Tools™ Best Practice}

Cooking & Bathroom exhausts to Duct externally through Wall or Eaves to minimise condensation

Roof

Non-combustible materials^[1]
Junctions sealed^[2]

Roofing RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

AS 3959:2018, 7.6.1 (a)

AS 3959:2018, 7.6.1 (b)

AS 3959:2018, 7.6.1 (e)

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, 7.6.1 (c)

AS 3959:2018, 7.6.1 (d)

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{AS 3959:2018, 7.6.1 (a)AS 3959:2018, 7.6.1 (b)}
Constructed with non-combustible materials^{AS 3959:2018, 7.6.1 (e)}
Roof/Roof & Roof/Wall junctions sealed, or^{NCC 2022 Vol 1, G5D1}
Reinforced with permeable sarking or mesh
Fit non-combustible ember guards or screens on Roof Ventilation Openings^{NCC 2022 Vol 2, H7D4}
Any pipe or conduit extending through the roof covering, to be non-combustible^{AS 3959:2018, 7.6.1 (c)}
Evaporative Coolers to be AS/NZS 60335.2.98 complaint^{AS 3959:2018, 7.6.1 (d)}
Coolers with internal ember dampers, do not require external screens

Screen RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, 3.6.1

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NCC 2022 Vol 1, G5D1NCC 2022 Vol 2, H7D4}
≤ 2mm aperture screen of corrosion-resistant steel, bronze, or aluminium^{AS 3959:2018, 3.6.1}

AS 3959:2018, 7.6.1 (a)

AS 3959:2018, 7.6.1 (b)

Non-combustible materials^{AS 3959:2018, 7.6.1 (a)}
Junctions sealed^{AS 3959:2018, 7.6.1 (b)}

Walls & Floors

Eaves

Bushfire-resisting Timber, or^[1]
≥ 4.5mm thk Fibre-cement sheet^[2]

Eaves Lining RULES

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

AS 3959:2018, 7.6.6 (c) (i)

AS 3959:2018, 7.6.6 (c) (ii)

AS 3959:2018, 7.6.6 (f)

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{AS 3959:2018, 7.6.6 (c) (i)AS 3959:2018, 7.6.6 (c) (ii)}
≥ 4.5mm Fibre-cement sheet, or^{AS 3959:2018, 7.6.6 (f)}
Bushfire-resisting Timber^{NCC 2022 Vol 1, G5D1}
Joints to be sealed with^{NCC 2022 Vol 2, H7D4}
Plastic Joining Strips or
Timber Storm Moulds

Bushfire Resisting Timber BAL-29

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, F4

AS 3959:2018, E1

AS 3959:2018, 1.5.5

AS 3959:2018, 7.1

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NCC 2022 Vol 1, G5D1NCC 2022 Vol 2, H7D4}
Bushfire-resisting Timber to AS 3959^{AS 3959:2018, F4}
Timber species as per AS 3959^{AS 3959:2018, E1}
Any solid, laminated, treated, or reconstituted Timber meeting BAL-29 compliance^{AS 3959:2018, 1.5.5AS 3959:2018, 7.1}

AS 3959:2018, 7.6.6 (c) (ii)

AS 3959:2018, 7.6.6 (c) (i)

Bushfire-resisting Timber, or^{AS 3959:2018, 7.6.6 (c) (ii)}
≥ 4.5mm thk Fibre-cement sheet^{AS 3959:2018, 7.6.6 (c) (i)}

Roofing Durability

Roof Penetrations

Seal with non-combustible material^[1]
Screen openings^[2]

Screen RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, 3.6.1

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NCC 2022 Vol 1, G5D1NCC 2022 Vol 2, H7D4}
≤ 2mm aperture screen of corrosion-resistant steel, bronze, or aluminium^{AS 3959:2018, 3.6.1}

Penetration RULES

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

AS 3959:2018, 7.6.5 (a)

AS 3959:2018, 7.6.5 (b)

AS 3959:2018, 7.6.5 (f)

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{AS 3959:2018, 7.6.5 (a)AS 3959:2018, 7.6.5 (b)}
Seal with non-combustible material^{AS 3959:2018, 7.6.5 (f)}
Screen openings^{NCC 2022 Vol 1, G5D1}
Evaporative Coolers^{NCC 2022 Vol 2, H7D4}
Non-combustible butterfly closers, or
Cover with mesh or perforated sheet
Corrosion-resistant steel, aluminium, or bronze
≤ 2mm aperture size

AS 3959:2018, 7.6.5 (a)

AS 3959:2018, 7.6.5 (b)

Seal with non-combustible material^{AS 3959:2018, 7.6.5 (a)}
Screen openings^{AS 3959:2018, 7.6.5 (b)}

Fascias

Bushfire-resisting Timber, or^[1]
450mm CTS if constructed with Metal^[2]

Bushfire Resisting Timber BAL-29

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, F4

AS 3959:2018, E1

AS 3959:2018, 1.5.5

AS 3959:2018, 7.1

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NCC 2022 Vol 1, G5D1NCC 2022 Vol 2, H7D4}
Bushfire-resisting Timber to AS 3959^{AS 3959:2018, F4}
Timber species as per AS 3959^{AS 3959:2018, E1}
Any solid, laminated, treated, or reconstituted Timber meeting BAL-29 compliance^{AS 3959:2018, 1.5.5AS 3959:2018, 7.1}

Fascia & Bargeboard RULES

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

AS 3959:2018, 7.6.6 (b) (ii)

AS 3959:2018, 7.6.6 (b) (i)

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{AS 3959:2018, 7.6.6 (b) (ii)AS 3959:2018, 7.6.6 (b) (i)}
450mm CTS fixings if constructed with Metal, or ^{NCC 2022 Vol 1, G5D1}
Bushfire-resisting Timber^{NCC 2022 Vol 2, H7D4}

AS 3959:2018, 7.6.6 (b) (i)

AS 3959:2018, 7.6.6 (b) (ii)

Bushfire-resisting Timber, or^{AS 3959:2018, 7.6.6 (b) (i)}
450mm CTS if constructed with Metal^{AS 3959:2018, 7.6.6 (b) (ii)}

Gutter

Non-combustible^[1]
Seal with Flashing^[2]

Guttering RULES

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, 7.6.7

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NCC 2022 Vol 1, G5D1NCC 2022 Vol 2, H7D4}
Guttering^{AS 3959:2018, 7.6.7}
Install non-combustible valley leaf guards & Gutter
Use metal or uPVC Gutters
Except for Box Gutters
Box Gutters to be non-combustible & fully flashed

AS 3959:2018, 7.6.7

Non-combustible^{AS 3959:2018, 7.6.7}
Seal with Flashing^{AS 3959:2018, 7.6.7}

Sarking

Roof to have a full layer of Sarking^[1][2]
Turn up into Gutters & Valleys^[3]
Continuous over Ridge^[4]

Sarking RULES

NCC 2022 V3

All Building Classes

NCC 2022 G5D1 & H7D4 [2019 G5.0, 3.10.5]

May 2023

NSW RFS 2019 PBP, 7.5.2

AS 3959:2018, 3.10

NCC 2022 Vol 1, G5D1

NCC 2022 Vol 2, H7D4

AS 3959:2018, 3.10

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to the NCC^{NSW RFS 2019 PBP, 7.5.2NSW RFS 2019 PBP, 7.5.2}
≤ 5 Flammability Index^{AS 3959:2018, 3.10}
Non-combustible material^{NCC 2022 Vol 1, G5D1}
Continuous to the outside of Walls & Roof^{NCC 2022 Vol 2, H7D4}
Type of Sarking varies based on location, consulting a professional is recommended^{AS 3959:2018, 3.10}

AS 3959:2018, 7.6.2

AS 3959:2018, 7.6.3 (a)

AS 3959:2018, 7.6.2 (c)

AS 3959:2018, 7.6.2 (b)

Roof to have a full layer of Sarking^{AS 3959:2018, 7.6.2AS 3959:2018, 7.6.3 (a)}
Turn up into Gutters & Valleys^{AS 3959:2018, 7.6.2 (c)}
Continuous over Ridge^{AS 3959:2018, 7.6.2 (b)}