Brick veneer cladding: installation guide for residential builders
Brick veneer cladding for Australian homes: AS 3700, NCC 2022, wall ties, weep holes, articulation joints, cavity width, DPC placement, and tolerances.
Ask Chalkline about this →TL;DR
Brick veneer is Australia’s most common external cladding system: a single 110 mm clay or concrete masonry leaf tied to a timber or steel frame, with a 25 to 75 mm clear cavity in between. The bricks carry no load, the frame carries everything. Bricklaying runs from DPC to top of wall in one continuous trade package, typically 3 to 6 weeks on a standard double-storey volume build. The single biggest site failure is a mortar-bridged cavity: mortar droppings on ties or at the base bridge the cavity, wick moisture to the frame, and create conditions for timber rot or steel corrosion. Second killer is missing or blocked weep holes. Both are invisible once the wall is up. The NCC 2022 Housing Provisions (Part 5.2 and 5.7, verified 2026-05-08) and AS 3700:2018 govern construction; ties, articulation joints, DPC, and weep holes are the four non-negotiable items on every frame inspection before bricklaying starts.
When you do this
Brick veneer cladding is laid after the structural frame is complete and inspected. The sequence sits between frame completion and external lockup:
- Frame inspection passed and tie-down hardware installed
- Sarking (if specified) fixed to frame
- DPC laid at footing level
- Brickwork commences: first course at DPC, working up storey by storey
- Lintels set over all openings as work reaches head height
- Articulation joints formed at required centres
- Weep holes installed in the course immediately above every flashing and DPC
- Brickwork to head of wall (soffit clearance maintained)
- Window/door frames installed, cavities flashed and sealed
- Final inspection and clean-down
Do not start bricklaying until the frame has been inspected. Corrections to the frame after brickwork is up are expensive and sometimes impossible without demolition.
Who’s involved
| Party | Role |
|---|---|
| Builder | Sequences the frame, installs tie-down hardware, coordinates frame inspection, manages clearances and hold points |
| Brickie | Lays all masonry, sets ties, forms articulation joints and weep holes, clears cavity droppings |
| Engineer | Specifies lintels, tie type and spacing for wind class, any non-standard details |
| Building certifier | Inspects DPC and first few courses (common hold point), inspects tie-downs before pour, signs off on completion |
| Waterproofer | Installs DPC material if not done by brickie or builder |
Steps
1. Verify wind classification and tie specification
The site wind class (N1 to N6 or C1 to C4) determines tie duty. For sites rated N2 or lower, light-duty veneer ties are the minimum. For sites rated above N2, medium-duty veneer ties are required as a minimum (ABCB Housing Provisions 5.6.5, verified 2026-05-08).
Wall tie spacing per Housing Provisions 5.6.5 (verified 2026-05-08):
| Stud spacing | Max horizontal tie spacing | Max vertical tie spacing |
|---|---|---|
| 450 mm | 450 mm | 600 mm |
| 600 mm | 600 mm | 400 mm |
Ties must be embedded a minimum of 50 mm into the masonry leaf. Select tie material for the exposure category: stainless steel or engineered polymer for marine or severe exposure; 470 g/m2 galvanised steel is acceptable for standard residential exposure per AS 2699.1 (verified 2026-05-08).
2. Install DPC and prepare the base
The damp-proof course goes in before the first brick course is laid. Minimum heights above finished surface per Housing Provisions 5.7.5 (verified 2026-05-08):
| Location | Min DPC height above surface |
|---|---|
| Standard ground | 150 mm |
| Paved or landscaped areas | 75 mm |
| Covered (carport, verandah) | 50 mm |
The DPC must be continuous and must lap a minimum of 150 mm at joins. It must extend to the outer face of the masonry leaf and turn down over the outer face to direct water out of the cavity. Flashing materials must comply with Housing Provisions 5.7.3.
3. Maintain the cavity
The clear cavity between the masonry leaf and the exterior face of the frame must be between 25 mm and 75 mm (Housing Provisions 5.7.2, verified 2026-05-08). For standard residential construction, 40 to 50 mm is the practical working dimension.
Keep the cavity clear:
- Spread mortar beds so they do not protrude more than 5 mm into the cavity
- Use a cavity cleaning board (a timber batten threaded down on ties) to scrape mortar droppings from ties and the footing as each lift is completed
- Do not allow mortar to accumulate on ties: a mortar-loaded tie provides a direct moisture pathway from the outer leaf to the frame
4. Install wall ties
Fix one wall tie per stud at every course within the spacings in Step 1. Ties must slope slightly downward toward the outer masonry face so condensation runs out, not inward. A tie installed with a reverse slope (sloping toward the frame) will funnel moisture toward the timber or steel.
Ties must not contact the frame face on one end and the masonry on the other with no drip point in between. Each tie should have a drip, a kink, or a corrugated section in the centre of the cavity to prevent moisture transfer. Per AS 2699.1 (verified 2026-05-08), ties must be embedded at least 50 mm into each leaf or fixed to the frame per the tie manufacturer’s specification.
5. Install weep holes
Weep holes must be installed in the course immediately above every flashing and every DPC (Housing Provisions 5.7.8, verified 2026-05-08). Minimum dimensions: 50 mm height by the width of the perpend (vertical mortar joint). Maximum spacing: 1.2 m centres.
Where a window or door opening is less than 1.2 m wide, weep holes are not required beneath the sill flashing (Housing Provisions 5.7.8, verified 2026-05-08).
In practice: leave every second or third perpend joint unfilled in the course above DPC and above every head flashing. Do not fill these weep holes with mesh, cloth, or broken brick fragments. A blocked weep hole is not a weep hole.
6. Form articulation joints
Articulation joints accommodate differential movement between the masonry leaf and the frame (thermal cycling, moisture movement, minor settlement). Requirements per Housing Provisions 5.6.8 (verified 2026-05-08):
| Wall condition | Max joint spacing | Additional rule |
|---|---|---|
| Straight wall, openings less than 900 x 900 mm (or no openings) | 6 m centres | Within 4.5 m, but not closer than 470 mm of all corners |
| Straight wall, any opening exceeds 900 x 900 mm | 5 m centres | Not more than 1.2 m from openings |
Minimum joint width: 10 mm, filled with flexible sealant backed by compressible foam backer rod or purpose-made backing. The joint must be continuous through the full height of the masonry leaf. Do not bridge the joint at any course with mortar.
Note: articulation joint requirements do not apply to sites with soil classification A or S per Housing Provisions 5.6.8.
7. Set lintels over openings
Every opening in masonry veneer requires a steel lintel unless the opening is 500 mm wide or less and is adequately supported (Housing Provisions 5.2.3, verified 2026-05-08). Minimum bearing lengths:
| Clear span | Minimum bearing each end |
|---|---|
| 1 m or less | 100 mm |
| More than 1 m | 150 mm |
At least three full masonry courses must be maintained above lintels (Housing Provisions 5.6.7, verified 2026-05-08). Lintel bearing surface must be bedded in mortar. Head flashings above lintels must turn up in the cavity a minimum of 150 mm above the opening and extend at least 150 mm beyond the reveals (Housing Provisions 5.7.4, verified 2026-05-08).
8. Maintain soffit clearance
The soffit framing (rafters, eaves lining bearers) must be set so that its inner end is a minimum of 20 mm clear above the top of brickwork at the time of construction (NCC 2022 Volume Two, H1D5, verified 2026-05-08). This clearance allows differential vertical movement between the masonry (which expands over time due to moisture and thermal effects) and the frame.
If the soffit is set too low and brickwork closes the gap, the veneer will push up against the eaves lining and the force will either crack the brickwork or lift the eaves. This is a very common defect on volume builds where soffit height is not monitored during bricklaying.
9. Keep mortar joints to gauge
Standard mortar joint thickness is 10 mm nominal for both bed joints (horizontal) and perpend joints (vertical). Acceptable deviation per AS 3700:2018 is +/- 3 mm on bed joint thickness (verified 2026-05-08). Perpend joints may be raked or flush-finished but must not be left hollow (unfilled). Open perpends, other than designated weep holes, allow direct water ingress into the cavity.
Mortar mix for standard residential brick veneer in unexposed conditions: 1 part cement, 1 part lime, 6 parts sand (type M mortar). Higher cement content (type S, 1:0.5:4.5) is used in higher wind classes or aggressive exposure. Check with the engineer if the project has any unusual exposure conditions.
Tolerances and acceptance
These tolerances apply to completed masonry veneer walls. Tolerances marked [HIA-NNN] require verification against the current HIA Guide to Materials and Workmanship when membership is available.
| Element | Tolerance |
|---|---|
| Wall plumb (deviation from vertical) | Per current HIA Guide to Materials and Workmanship. Verified numerical value pending HIA member access. [HIA-045] |
| Wall bow (deviation from plane in any 2 m length) | Per current HIA Guide to Materials and Workmanship and relevant state Guide. Verified numerical value pending HIA member access. [HIA-046] |
| Bed joint thickness deviation | +/- 3 mm per AS 3700:2018 (verified 2026-05-08) |
| Perpend joint thickness (nominal 10 mm) | Not less than 5 mm, per NCC Housing Provisions 5.6.4 (verified 2026-05-08) |
| Cavity width | 25 mm to 75 mm clear (Housing Provisions 5.7.2, verified 2026-05-08) |
| Soffit clearance above brickwork | Minimum 20 mm (NCC 2022 Volume Two H1D5, verified 2026-05-08) |
| DPC height above finished surface | See Step 2 table above (Housing Provisions 5.7.5, verified 2026-05-08) |
Workmanship assessment: the general workmanship test for visible masonry is whether defects are visible at 6.1 m with diffused light. Colour variation in bricks, minor joint irregularities, and minor course variation that are not visible at 6.1 m are typically acceptable. Structural tolerance failures (plumb, cavity, ties, DPC, weep holes) are assessed independently of this visual test.
Documents needed
| Document | Who holds it | When needed |
|---|---|---|
| Engineering drawings or structural details | Builder | Before work starts; tie and lintel specification |
| Wind classification certificate | Builder | Before specifying tie duty |
| Site soil classification report | Builder | Required for articulation joint determinations |
| Tie manufacturer’s data sheet | Brickie/builder | Confirm embedment depth, corrosion class |
| DPC / flashing installation evidence (photos) | Builder | For certifier inspection and defects reference |
| Frame inspection certificate | Building certifier | Required before brickwork starts |
Common holds
- Frame inspection hold: certifier inspects frame and tie-downs before brickwork is permitted to start. Ensure this is booked with the brickie’s start date.
- DPC inspection: some certifiers require a hold-point inspection after DPC is laid and before the first brick course. Confirm with the building certifier before work starts.
- Practical completion inspection: brickwork joints, DPC line, weep holes, articulation joints, and soffit clearance are all PCI items. Defects in these elements are typically on the NCC non-compliance list and must be rectified before PC can be issued.
What can go wrong
| Defect | Cause | How to catch it |
|---|---|---|
| Moisture in the frame (wet timber, rust) | Mortar droppings bridging the cavity, or ties installed sloping inward, or DPC not lapped correctly | Inspect cavity before upper courses close off access; use endoscope camera after completion |
| Cracking in brickwork (diagonal) | Articulation joints missing, undersized, or bridged with mortar; differential settlement | Check joint positions before laying; inspect full height after completion |
| Rising damp staining on internal walls | DPC installed too low, DPC lapped short, DPC not turned down over outer face | Inspect DPC level at every corner before bricklaying starts |
| Efflorescence (white salt staining) | Weep holes blocked or missing, DPC not at correct height, mortar soaking up ground moisture | Check weep hole positions in each course immediately above DPC and flashings |
| Veneer bowing or leaning outward | Insufficient ties, ties not engaging frame fixings, ties spaced too far apart | Check tie installation against spacing table before upper courses are out of reach |
| Eaves lifting or cracks at soffit | Soffit set too close to top of brick; no clearance for veneer expansion | Verify soffit height before bricklaying starts and again at top course |
| Cracked or spalled brickwork at corners | Articulation joints placed too close to corners (under 470 mm) | Check joint positions on drawing and on site before laying |
References
- ABCB, NCC 2022 Housing Provisions Standard, Section 5 Masonry (Parts 5.2, 5.6, 5.7), ABCB, 2022. ncc.abcb.gov.au (verified 2026-05-08)
- Standards Australia, AS 3700:2018, Masonry structures, Standards Australia, 2018. (verified 2026-05-08 via Standards Australia store at store.standards.org.au)
- Standards Australia, AS 4773.2:2015, Masonry in small buildings, Part 2: Construction, Standards Australia, 2015. (verified 2026-05-08)
- Standards Australia, AS 2699.1:2000, Built-in components for masonry construction, Part 1: Wall ties, Standards Australia, 2000. (verified 2026-05-08)
- ABCB, NCC 2022 Volume Two, H1D5: Structure (Class 1 and 10 buildings), ABCB, 2022. ncc.abcb.gov.au (verified 2026-05-08)
- Think Brick Australia, Technical resources and fact sheets (Weepholes, Wall Ties, Flashings and DPCs, The Brickwork Guide), Think Brick Australia, accessed 2026-05-08. thinkbrick.com.au
Related
- Masonry veneer (glossary)
- Articulation joint (glossary)
- Weep hole (glossary)
- Damp-proof course (glossary)
- Brick gauge (glossary)
- AS 3700:2018 masonry structures
- First fix / second fix sequence
- Brickie (trade)
See also
- Cavity masonry (glossary)
- Perpend (glossary)
- Lintel (glossary)
- Sarking (glossary)
- Wind classification (glossary)
- Snots (glossary)
- Tie-down (glossary)
- Flashing (glossary)
- Workmanship (glossary)
- Tolerance (glossary)
Last updated: 2026-05-08. Verified: 2026-05-08. Quarterly review for currency.