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!

Roofing Durability

Eaves Penetrations

Equipped with Ember Guard, protection Screens & comprehensively Sealed^[1][2][3]

Eaves Penetrations RULES

NCC 2022 V1

All Building Classes

NCC 2022 H7D4 [2019 3.10.5]

May 2023

AS 3959:2018, 3.10

AS 3959:2018, 7.6.6 (d)

AS 3959:2018, 7.6.6 (e)

AS 3959:2018, 7.6.6 (f)

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Seal Roof penetrations with non-combustible material^{AS 3959:2018, 3.10}
Equipped with Ember Guard, protection Screens & comprehensively Sealed^{AS 3959:2018, 7.6.6 (d)}
Joints to be comprehensively sealed^{AS 3959:2018, 7.6.6 (e)}
Corrosion-resistant Steel or Bronze Perforated Sheet or Mesh with^{AS 3959:2018, 7.6.6 (f)}
≤ 2mm aperture size or opening

AS 3959:2018, 7.6.6 (d)

AS 3959:2018, 7.6.6 (e)

AS 3959:2018, 7.6.6 (f)

Equipped with Ember Guard, protection Screens & comprehensively Sealed^{AS 3959:2018, 7.6.6 (d)AS 3959:2018, 7.6.6 (e)AS 3959:2018, 7.6.6 (f)}

Eaves

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

Eaves Lining RULES

NCC 2022 V1

All Building Classes

NCC 2022 H7D4 [2019 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)

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
≥ 4.5mm Fibre-cement sheet, or^{AS 3959:2018, 7.6.6 (c) (i)}
Bushfire-resisting Timber^{AS 3959:2018, 7.6.6 (c) (ii)}
Joints can be weatherproofed with seal^{AS 3959:2018, 7.6.6 (f)}
Plastic Joining Strips or
Timber Storm Moulds

Bushfire Resisting Timber BAL-29

NCC 2022 V2

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, F4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Bushfire-resisting Timber to AS 3959
Timber species per AS 3959
Any solid, laminated, treated, or reconstituted Timber meeting BAL-29 compliance^{AS 3959:2018, F4}

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^{AS 3959:2018, 7.6.6 (c) (i)}

Sarking

Roofs need a full layer of Sarking^[1][2]
Turned up into Gutters & Valleys^[3]
Continuous over Ridge^[4]

Sarking RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 3.6.1

NSW RFS 2019 PBP, 7.5.2

AS 3959:2018, 3.10

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
≤ 5 Flammability Index^{AS 3959:2018, 3.6.1}
Non-combustible material^{NSW RFS 2019 PBP, 7.5.2}
Continuous to the outside to Walls & Roof^{NSW RFS 2019 PBP, 7.5.2}
Type of Sarking varies on building 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)

Roofs need a full layer of Sarking^{AS 3959:2018, 7.6.2AS 3959:2018, 7.6.3 (a)}
Turned up into Gutters & Valleys^{AS 3959:2018, 7.6.2 (c)}
Continuous over Ridge^{AS 3959:2018, 7.6.2 (b)}

Sarking

Fascia

Joint Strip

Sarking

Battens

Eaves Lights

Fully Sealed

BAL-29 Certified

Roof Ventilator

Fixings on every corrugation

Turn Sarking into Gutter

Fire Resistant Foam Filler Strips

Provides additional weather & ember protection

Eaves Vent

Fixings on every 2nd corrugation

Fire Resistant Foam Filler Strips

Provides additional weather & ember protection

Walls & Floors

Fascias

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

Bushfire Resisting Timber BAL-29

NCC 2022 V2

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, F4

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Bushfire-resisting Timber to AS 3959
Timber species per AS 3959
Any solid, laminated, treated, or reconstituted Timber meeting BAL-29 compliance^{AS 3959:2018, F4}

Fascias & Bargeboards RULES

NCC 2022 V1

All Building Classes

NCC 2022 H7D4 [2019 3.10.5]

May 2023

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

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

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
450mm CTS fixings if constructed with Metal, or ^{AS 3959:2018, 7.6.6 (b) (ii)}
Bushfire-Resisting Timber^{AS 3959:2018, 7.6.6 (b) (i)}

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)}

AS 3959:2018, 3.10

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

Roof Framing

Ridge Capping

Mineral Wool Insulation

Fully Sarked

Storm Moulds

Eaves Lining

Gutter

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

Guttering RULES

NCC 2022 V4

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 7.6.7

AS 3959:2018, 6.6.2

AS 3959:2018, 6.6.7

AS 3959:2018, 7.6.7

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Metal or uPVC Eaves Gutter^{AS 3959:2018, 7.6.7}
Turn Sarking into Gutter^{AS 3959:2018, 6.6.2}
Box Gutter non-combustible & fully flashed^{AS 3959:2018, 6.6.7}
Valley Leaf Guards, optional non-combustible^{AS 3959:2018, 7.6.7}

AS 3959:2018, 7.6.7

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

Exhaust

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

Roof Penetrations

Sealed with non-combustible materials^[1]
Openings screened^[2]

Penetration RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 7.6.5 (a)

AS 3959:2018, 7.6.5 (b)

AS 3959:2018, 7.6.5 (f)

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Sealed with non-combustible material^{AS 3959:2018, 7.6.5 (a)}
Openings screened^{AS 3959:2018, 7.6.5 (b)}
Evaporative Coolers^{AS 3959:2018, 7.6.5 (f)}
Non-combustible Butterfly Closers near the Roof or
Covers with corrosion-resistant Mesh or Perforated sheet
≤ 2mm aperture size or opening

Screen RULES

NCC 2022 V4

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 3.6

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Corrosion-resistant Steel or Bronze Perforated Sheet or Mesh with
≤ 2mm aperture size or opening^{AS 3959:2018, 3.6}

AS 3959:2018, 7.6.5 (a)

AS 3959:2018, 7.6.5 (b)

Sealed with non-combustible materials^{AS 3959:2018, 7.6.5 (a)}
Openings screened^{AS 3959:2018, 7.6.5 (b)}

Roof

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

Roofing RULES

NCC 2022 V2

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 7.6.1 (a)

AS 3959:2018, 7.6.1 (b)

AS 3959:2018, 7.6.1 (c)

AS 3959:2018, 7.6.1 (e)

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Constructed with Non-combustible materials^{AS 3959:2018, 7.6.1 (a)}
Roof/Roof & Roof/Wall junctions sealed, or^{AS 3959:2018, 7.6.1 (b)}
Backed with a breathable Sarking or Mesh^{AS 3959:2018, 7.6.1 (c)}
Roof Ventilation openings fitted with non-combustible Ember Guards, or Screens^{AS 3959:2018, 7.6.1 (e)}
Evaporative Coolers AS/NZS 60335.2.98 complaint^{AS 3959:2018, 7.6.1 (e)}
Coolers with internal Ember Dampers, external Screen not required

Screen RULES

NCC 2022 V4

All Building Classes

NCC 2022 G5, H7D4, & S1

[2019 G5, 3.10.5, Sch 5]

May 2023

AS 3959:2018, 3.6

Building elements within Bushfire-prone Areas to be Bushfire Attack Resistant to NCC Specification 1, NCC Part G5, & AS 3959
Corrosion-resistant Steel or Bronze Perforated Sheet or Mesh with
≤ 2mm aperture size or opening^{AS 3959:2018, 3.6}

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)}