Cladding Building Codes & Rules

- Optimise cladding construction compliance with Tools™: Rules for weatherboard and sheet cladding, profiled and splayed timber, flashing and more.

Soffit Trimmer

Corner

Flashing

Sill Flashing

Tools™ Best Practice

150^{Tools™ Best Practice}

Cladding

Trim

Under-Sill

Flashing

Fully

Sarked

Top Plate

Masonry

NCC 2022 HP, 7.5.6 (d)

W^{NCC 2022 HP, 7.5.6 (d)}

Bushfire Construction

Cavity

Closer

Head

Flashing

Storm Mould

Overlap

NCC 2022 HP, 7.5.6 (d)

H^{NCC 2022 HP, 7.5.6 (d)}

Jamb Flashing

Fully Sarked

Cavity to help prevent

condensation

Framing Overview (Light Steel)

NCC 2022 HP, 7.5.6 (a) (i)

≥ 110^{NCC 2022 HP, 7.5.6 (a) (i)}

Industry Recommendation

10^{Industry Recommendation}

Overlap

NCC 2022 HP, 7.5.2 (3) (c) (i) (A)

≥150^{NCC 2022 HP, 7.5.2 (3) (c) (i) (A)}

Industry Recommendation

≥ 75^{Industry Recommendation}

Framing Overview (Timber)

Industry Recommendation

100^{Industry Recommendation}

Splayed Timber

Overlaps
≥ 30mm for hardwood, Cypress & treated pine^[1]
≥ 20mm for Western Red Cedar^[2]
≥ 25mm for Baltic Pine^[3]
1 fixing at each stud^[4]

Splayed Timber INSTALLATION

NCC 2022 V2

All Building Classes

NCC 2022 7.5.2 [2019 3.5.4.2]

May 2023

NCC 2022 HP, 7.5.2 (2) (a)

NCC 2022 HP, 7.5.2 (2) (b)

NCC 2022 HP, 7.5.2 (2) (c)

NCC 2022 HP, 7.5.2 (4) (a)

Overlap
≥ 30mm for hardwood, Cypress & treated pine^{NCC 2022 HP, 7.5.2 (2) (a)}
≥ 20mm for Western Red Cedar^{NCC 2022 HP, 7.5.2 (2) (b)}
≥ 25mm for Baltic Pine^{NCC 2022 HP, 7.5.2 (2) (c)}
Fixing
1 fixing at each stud or framing member^{NCC 2022 HP, 7.5.2 (4) (a)}

Timber Cladding FIXINGS

NCC 2022 V1

All Building Classes

NCC 2022 7.5.2 [2019 3.5.4.2]

May 2023

NCC 2022 HP, 7.5.2 (5) (c)

NCC 2022 HP, 7.5.2 (5) (a)

NCC 2022 HP, 7.5.2 (5) (b)

NCC 2022 HP, 7.5.2 (5) (d)

NCC 2022 HP, 7.5.2 (4) (d)

Should not penetrate the board beneath^{NCC 2022 HP, 7.5.2 (5) (c)}
When fixings are punched or countersunk & filled prior to painting^{NCC 2022 HP, 7.5.2 (5) (a)}
Standard steel flat head nails or
Standard steel self-embedding head screws
Western red cedar timber requires suitable fixings^{NCC 2022 HP, 7.5.2 (5) (b)}
Silicon bronze, monel metal, stainless steel or hot-dipped galvanised
With a building located at ≤ 200m from a breaking surf^{NCC 2022 HP, 7.5.2 (5) (d)}
Stainless steel fixings for timber frames, or
Hot-dipped galvanized fixings ≥ 600g/m2 for steel frames
In all other cases, hot-dipped galvanised fixings^{NCC 2022 HP, 7.5.2 (4) (d)}
Flat head nails ≥ 600g/m2
Self-embedding head or wafer head screws ≥ 600g/m2

NCC 2022 HP, 7.5.2 (2) (a)

NCC 2022 HP, 7.5.2 (2) (b)

NCC 2022 HP, 7.5.2 (2) (c)

NCC 2022 HP, 7.5.2 (4) (a)

Overlaps
≥ 30mm for hardwood, Cypress & treated pine^{NCC 2022 HP, 7.5.2 (2) (a)}
≥ 20mm for Western Red Cedar^{NCC 2022 HP, 7.5.2 (2) (b)}
≥ 25mm for Baltic Pine^{NCC 2022 HP, 7.5.2 (2) (c)}
1 fixing at each stud^{NCC 2022 HP, 7.5.2 (4) (a)}

Head Flashing

≥ 110mm extension beyond reveal^[1]
Tuck under Sarking & over Jamb Flashing^[2]

BEST PRACTICE

NCC 2022 V1

Head Flashing RULES

NCC 2022 V1

All Building Classes

NCC 2022 7.5.6 [2019 3.5.4.6]

May 2023

NCC 2022 HP, 7.5.6 (d)

NCC 2022 HP, 7.5.6 (a) (i)

NCC 2022 HP, 7.5.6 (b) (i)

NCC 2022 HP, 7.5.6 (b) (ii)

NCC 2022 HP, 7.5.6 (b) (iii)

NCC 2022 HP, 7.5.6 (e)

Not required if the opening is protected by an eave where
W ≥ 3 x H^{NCC 2022 HP, 7.5.6 (d)}
≥ 110mm^{NCC 2022 HP, 7.5.6 (a) (i)} extension beyond reveals
Tuck under Sarking & over Jamb Flashing
Tape over flashing junction
Securely attach to wall framing & fold over window to form drip
≥ 25mm under the cladding,^{NCC 2022 HP, 7.5.6 (b) (i)}
Should extend over the ends and edges of the opening frame
Joins
≥ 75mm overlap in the direction of flow^{NCC 2022 HP, 7.5.6 (b) (ii)}
End laps sealed fastened
≤ 40mm intervals^{NCC 2022 HP, 7.5.6 (b) (iii)}
Sealed between laps^{NCC 2022 HP, 7.5.6 (e)}

NCC 2022 HP, 7.5.6 (a) (i)

NCC 2022 HP, 7.5.6 (e)

≥ 110mm extension beyond reveal^{NCC 2022 HP, 7.5.6 (a) (i)}
Tuck under Sarking & over Jamb Flashing^{NCC 2022 HP, 7.5.6 (e)}

Masonry Veneer

Sheet Cladding

6mm Fibre-cement^[1]
9.5mm Hardboard^[2]
≥ 6.5mm Structural Plywood^[3]

Sheet Cladding INSTALLATION

NCC 2022 V4

All Building Classes

NCC 2022 7.5.4 [2019 3.5.4.4]

May 2023

NCC 2022 HP, 7.5.4 (1)

NCC 2022 HP, 7.5.4 (2)

NCC 2022 HP, 7.5.4 (3)

Fibre cement^{NCC 2022 HP, 7.5.4 (1)}
6mm sheet with fixing centers as per table below
2.8mm nails
≥ 50mm fixings distance from corners edge
≥ 30mm fasteners penetration into a timber frame
Hardboard^{NCC 2022 HP, 7.5.4 (2)}
9.5mm sheet with fixing centers as per table below
2.8mm galvanised clouts or flat head nails
≥ 12mm fixings distance from sheet edges
≥ 50mm fixings distance from corners edge
≥ 30mm fasteners penetration into a timber frame
Structural plywood^{NCC 2022 HP, 7.5.4 (3)}
≥ 6.5mm sheet with fixing centers as per table below
2.8mm or 3.5mm galvanised clouts or flat head nails
≥ 12mm fixings distance from sheet edges
≥ 50mm fixings distance from corners edge
≥ 30mm fasteners penetration into a timber frame

NCC 2022 HP, 7.5.4 (1) (b)

NCC 2022 HP, 7.5.4 (2) (b)

NCC 2022 HP, 7.5.4 (3) (b)

6mm Fibre-cement^{NCC 2022 HP, 7.5.4 (1) (b)}
9.5mm Hardboard^{NCC 2022 HP, 7.5.4 (2) (b)}
≥ 6.5mm Structural Plywood^{NCC 2022 HP, 7.5.4 (3) (b)}

Weatherboard Cladding

≥ 7.5mm fibre cement^[1]
≥ 9.5mm hardboard^[2]

Weatherboard Cladding INSTALLATION

NCC 2022 V4

All Building Classes

NCC 2022 7.5.3 [2019 3.5.4.3]

May 2023

NCC 2022 HP, 7.5.3 (a)

NCC 2022 HP, 7.5.3 (b)

NCC 2022 HP, 7.5.3 (d) (i)

NCC 2022 HP, 7.5.3 (d) (ii)

NCC 2022 HP, 7.5.3 (c) (i)

NCC 2022 HP, 7.5.3 (c) (ii)

NCC 2022 HP, 7.5.3 (c)

NCC 2022 HP, 7.5.3 (c) (iii)

NCC 2022 HP, 7.5.3 (c) (iv)

NCC 2022 HP, 7.5.3

Fibre cement
≥ 7.5mm board^{NCC 2022 HP, 7.5.3 (a)}
≥ 25mm overlap^{NCC 2022 HP, 7.5.3 (b)}
Hardboard
≥ 9.5mm board^{NCC 2022 HP, 7.5.3 (d) (i)}
≥ 20mm overlap^{NCC 2022 HP, 7.5.3 (d) (ii)}
Fixings
1 fixing at each stud or framing member^{NCC 2022 HP, 7.5.3 (c) (i)}
For boards ≤ 130mm wide
2 fixings at each stud or framing member^{NCC 2022 HP, 7.5.3 (c) (ii)}
For boards > 130mm wide
≥ 30mm fasteners penetration into a timber frame^{NCC 2022 HP, 7.5.3 (c)}
≥ 2 full screw threads through steel frames^{NCC 2022 HP, 7.5.3 (c)}
≤ 100mm centres for fixing along studs^{NCC 2022 HP, 7.5.3 (c) (iii)}
Should not penetrate the board beneath^{NCC 2022 HP, 7.5.3 (c) (iv)}
Fixing centers as per table below^{NCC 2022 HP, 7.5.3}

NCC 2022 HP, 7.5.3 (a)

NCC 2022 HP, 7.5.3 (b)

≥ 7.5mm fibre cement^{NCC 2022 HP, 7.5.3 (a)}
≥ 9.5mm hardboard^{NCC 2022 HP, 7.5.3 (b)}

Window Flashing

≥ 110mm extension beyond reveal^[1]
Sill flashing tucks under Jamb Flashing^[2]

Window FLASHING

NCC 2022 V2

All Building Classes

NCC 2022 7.5.6 [2019 3.5.4.6]

May 2023

NCC 2022 HP, 7.5.6 (b)

NCC 2022 HP, 7.5.6 (e)

NCC 2022 HP, 7.5.6 (a) (iii)

NCC 2022 HP, 7.5.6 (e)

Industry Recommendation

Attached to window (usually by manufacturer)^{NCC 2022 HP, 7.5.6 (b)}
Tuck behind wall cladding^{NCC 2022 HP, 7.5.6 (e)}
Drains to the outer face at top & bottom of the opening^{NCC 2022 HP, 7.5.6 (a) (iii)}
Securely fixed^{NCC 2022 HP, 7.5.6 (a) (iii)}
≥ 25mm under the cladding, &
Should extend over the ends and edges of the opening frame
Sill flashing to tuck between weatherboards to drain to exterior^{NCC 2022 HP, 7.5.6 (e)}
Joins^{Industry Recommendation}
≥ 75mm overlap in the flow direction
Securely fastened
≤ 40mm intervals
Sealed between laps

NCC 2022 HP, 7.5.6 (a) (i)

NCC 2022 HP, 7.5.6 (e)

≥ 110mm extension beyond reveal^{NCC 2022 HP, 7.5.6 (a) (i)}
Sill flashing tucks under Jamb Flashing^{NCC 2022 HP, 7.5.6 (e)}

Eaves Lining

4.5mm or 6mm FC board^[1]
Trimmer spacing determined by wind class & manufacturer recommendations^[2]

Eaves & Soffit FIXINGS

NCC 2022 V3

All Building Classes

NCC 2022 7.5.3 [2019 3.5.4.3]

May 2023

NCC 2022 HP, 7.5.5 (b) (ii)

NCC 2022 HP, 7.5.5 (b) (i)

NCC 2022 HP, 7.5.5 (b) (ii)

NCC 2022 HP, 7.5.5 (b) (iii)

4.5mm or 6mm^{NCC 2022 HP, 7.5.5 (b) (ii)} board with fixing centers as per table below
2.8 x 30 mm^{NCC 2022 HP, 7.5.5 (b) (i)} nails, or
No. 8 wafer head screws^{NCC 2022 HP, 7.5.5 (b) (ii)}
for 4.5mm & 6mm sheets only, or
No. 8 self-embedding head screws^{NCC 2022 HP, 7.5.5 (b) (iii)}
for 6mm sheets only

NCC 2022 HP, 7.5.5 (b)

NCC 2022 HP, 7.5.5

4.5mm or 6mm FC board^{NCC 2022 HP, 7.5.5 (b)}
Trimmer spacing determined by wind class & manufacturer recommendations^{NCC 2022 HP, 7.5.5}

Finished Ground

≥ 100mm to well-drained areas^[1]
≥ 50mm to impermeable areas^[2]
≥ 150mm to any other areas^[3]
≥ 50mm extension below the bearer^[4]

Cladding to Ground CLEARANCE

NCC 2022 V2

All Building Classes

NCC 2022 7.5.7 [2019 3.5.4.7]

May 2023

NCC 2022 HP, 7.5.7 (1)

NCC 2022 HP, 7.5.7 (2)

Clearance^{NCC 2022 HP, 7.5.7 (1)}
≥ 100mm in well-drained areas
Low rainfall intensity areas or sandy
≥ 50mm above impermeable areas that slope away from the building
≥ 150mm in any other case
Extension^{NCC 2022 HP, 7.5.7 (2)}
≥ 50mm wall cladding extension below the bearer or lowest horizontal part of the suspended floor framing

NCC 2022 HP, 7.5.7 (1) (a)

NCC 2022 HP, 7.5.7 (1) (c)

NCC 2022 HP, 7.5.7 (1) (b)

NCC 2022 HP, 7.5.7 (2)

≥ 100mm to well-drained areas^{NCC 2022 HP, 7.5.7 (1) (a)}
≥ 50mm to impermeable areas^{NCC 2022 HP, 7.5.7 (1) (c)}
≥ 150mm to any other areas^{NCC 2022 HP, 7.5.7 (1) (b)}
≥ 50mm extension below the bearer^{NCC 2022 HP, 7.5.7 (2)}

Junction with Masonry

Allow for movement
Close off junction to protect from weather or pest entry

Masonry JUNCTION

NCC 2022 V1

Junction of Masonry to the following
≥ 65mm flashing angle to depth to suit to close off Cavity
≥ 30mm cladding tucked behind masonry
Cladding installed prior to masonry
Sealant to ends of cladding over bond breaker tape
Optional trim to close off the junction

Allow for movement
Close off junction to protect from weather or pest entry

Profiled Timber

Horizontal, vertical, or diagonal fixings^[1]
Overlap & groove closely fitted^[2]
1 fixing at each stud for boards ≤ 130mm wide^[3]
2 fixing at each stud for boards > 130mm wide^[4]

Profiled Timber INSTALLATION

NCC 2022 V3

All Building Classes

NCC 2022 7.5.2 [2019, 3.5.4.2]

May 2023

NCC 2022 HP, 7.5.2 (3)

NCC 2022 HP, 7.5.2 (3) (c) (i)

NCC 2022 HP, 7.5.2 (3) (c) (i) (A)

NCC 2022 HP, 7.5.2 (4) (b)

NCC 2022 HP, 7.5.2 (4) (c)

Horizontal, vertical, or diagonal fixings^{NCC 2022 HP, 7.5.2 (3)}
Overlap & groove closely fitted
Tongue and groove profile with tongue edge up
Sarking
Fixed at ≤ 300mm^{NCC 2022 HP, 7.5.2 (3) (c) (i)} centres to supporting members
≥ 150mm^{NCC 2022 HP, 7.5.2 (3) (c) (i) (A)} overlap, or
Taped together
1 fixing at each stud or framing member^{NCC 2022 HP, 7.5.2 (4) (b)}
For boards ≤ 130mm wide
2 fixings at each stud or framing member^{NCC 2022 HP, 7.5.2 (4) (c)}
For boards > 130mm wide

Timber Cladding FIXINGS

NCC 2022 V1

All Building Classes

NCC 2022 7.5.2 [2019 3.5.4.2]

May 2023

NCC 2022 HP, 7.5.2 (5) (c)

NCC 2022 HP, 7.5.2 (5) (a)

NCC 2022 HP, 7.5.2 (5) (b)

NCC 2022 HP, 7.5.2 (5) (d)

NCC 2022 HP, 7.5.2 (4) (d)

Should not penetrate the board beneath^{NCC 2022 HP, 7.5.2 (5) (c)}
When fixings are punched or countersunk & filled prior to painting^{NCC 2022 HP, 7.5.2 (5) (a)}
Standard steel flat head nails or
Standard steel self-embedding head screws
Western red cedar timber requires suitable fixings^{NCC 2022 HP, 7.5.2 (5) (b)}
Silicon bronze, monel metal, stainless steel or hot-dipped galvanised
With a building located at ≤ 200m from a breaking surf^{NCC 2022 HP, 7.5.2 (5) (d)}
Stainless steel fixings for timber frames, or
Hot-dipped galvanized fixings ≥ 600g/m2 for steel frames
In all other cases, hot-dipped galvanised fixings^{NCC 2022 HP, 7.5.2 (4) (d)}
Flat head nails ≥ 600g/m2
Self-embedding head or wafer head screws ≥ 600g/m2

NCC 2022 HP, 7.5.3 (c) (i)

NCC 2022 HP, 7.5.3 (c) (ii)

NCC 2022 HP, 7.5.2 (3) (a)

Horizontal, vertical, or diagonal fixings^{NCC 2022 HP, 7.5.3 (c) (i)}
Overlap & groove closely fitted^{NCC 2022 HP, 7.5.3 (c) (ii)}
1 fixing at each stud for boards ≤ 130mm wide^{NCC 2022 HP, 7.5.2 (3) (a)}
2 fixing at each stud for boards > 130mm wide^{NCC 2022 HP, 7.5.2 (3) (a)}