Brick veneer construction is the dominant housing type across Wagga Wagga’s post-war suburbs, particularly in areas like Bourkelands, Glenfield Park, and the housing estates developed from the 1970s onward. It is also a construction method that produces a lot of cracking on reactive clay sites, not all of which is cause for alarm. The challenge for homeowners is distinguishing cosmetic cracking from cracking that indicates structural foundation movement. For broader context on how foundation movement produces cracking patterns, see our guide on cracking in summer heat.
Quick answer (BLUF)
Brick veneer is a non-structural external skin, the house frame carries the loads. Cracks in brick veneer are therefore less immediately critical than cracks in full-brick or cavity-brick construction. However, cracking that tracks diagonal, stepped patterns across multiple courses, widens progressively, or corresponds to movement in the timber frame beneath is always worth investigating. On Wagga’s reactive clay, ignoring brick veneer cracking invites water entry and long-term deterioration.
What brick veneer is, and is not
Brick veneer construction uses a single-skin brick outer wall tied back to a timber stud frame with metal brick ties. The timber frame carries the structural loads (roof, floors, internal walls). The brickwork is essentially cladding, it is not part of the load-bearing structure.
This is fundamentally different from double-brick or cavity-brick construction, where both skins of brickwork contribute to structural stability. In a brick veneer home, even significant cracking in the external skin does not necessarily mean the structure is unsafe, the frame behind it may remain intact.
However, this distinction does not mean brick veneer cracking can be ignored. Cracks admit water, and repeated wetting and drying of reactive clay beneath a brick veneer footing accelerates the foundation movement that caused the cracking in the first place. More importantly, while the brickwork itself is non-structural, the footing beneath it is structural, and cracking in the veneer is a visible indicator of footing movement.
Common crack patterns in Wagga brick veneer homes
Diagonal cracks from door and window corners
The most common crack type in brick veneer homes on reactive clay. These typically run at 45° from the top corners of openings, following the line of weakest tensile resistance in the mortar joints. They indicate differential settlement in the footing below the wall, one side dropping relative to the other.
Isolated hairline diagonal cracks (under 1 mm wide) are very common in Wagga homes after a dry summer and often close partially when rains return. Cracks wider than 3 mm, cracks that grow each year, or multiple diagonal cracks in the same wall section indicate significant differential movement.
Stepped cracks along mortar joints
Stepped cracks, running along horizontal mortar courses and then vertically through a perpend joint, indicate horizontal shear movement. On reactive clay, these typically appear where the footing edge has dropped faster than the interior, creating a slope across the base of the veneer skin.
Vertical cracks in the veneer skin
A single vertical crack in a brick veneer wall is often at a thermal movement joint (or a location where one should have been installed). Long vertical cracks that run from the top to the bottom of the veneer, or that open to more than 3 mm, can indicate the veneer skin pulling away from the frame behind it. Check whether the brick ties behind the wall are intact, a builder or inspector can probe for this through the crack or via a subfloor inspection.
Cracks at the base of the veneer near the damp course
Horizontal cracking along or immediately above the damp proof course (DPC) can indicate either differential footing movement or the effects of moisture saturation beneath the damp course. This is a particularly important area to investigate, as the DPC is critical to preventing moisture from the footing being drawn up into the wall.
How to assess whether a crack is structural
Several factors help distinguish cosmetic from structural cracking:
Width. Cracks under 1 mm are typically cosmetic in brick veneer. Cracks over 3 mm are worth investigating. Cracks over 5 mm should be assessed by a professional promptly.
Pattern. Isolated single cracks are lower risk than multiple cracks following the same pattern across a wall. Cracks that track continuously from one course to another across a large portion of a wall elevation are more significant.
Taper. If a crack is wider at the top than the bottom, the wall is rotating, typically due to the footing dropping on one side. The taper indicates the direction of movement.
Change over time. A crack that has remained the same width for five years is different from one that has grown from 1 mm to 4 mm in a single summer.
Corresponding internal signs. A crack in the external brickwork that corresponds with an out-of-square door frame, a sticking door, or a crack in the internal plasterboard on the same wall is a stronger indicator of foundation movement than external cracking alone.
Repair approach
Before repairing brick veneer cracks, the cause must be addressed, or the repair will simply re-crack. If the cracks are due to foundation movement, a foundation inspection will diagnose the underlying issue and direct the appropriate intervention, whether that is foundation crack repair, underpinning, or drainage correction.
Once the foundation is stable (or as stable as practical), the cracks themselves can be repaired. This typically involves raking out the damaged mortar, applying flexible pointing compound matched to the existing mortar colour, and monitoring for at least one full seasonal cycle to confirm stability.
FAQs
My 1980s brick veneer home has cracks, is this normal for Wagga?
Wagga’s reactive clay climate means that a 1980s brick veneer home showing some cracking is not unusual. The question is whether the cracks are cosmetic and stable or indicative of progressive foundation movement. If you have not had the foundation condition formally assessed in the last five to ten years, a foundation inspection is worthwhile.
Can water get in through brick veneer cracks?
Yes, and this matters. Water entering through a crack in the veneer reaches the cavity between the brick skin and the frame. If the cavity drainage (weep holes) is intact, most water drains away. But in older homes where weep holes are blocked or the cavity is bridged by mortar droppings, moisture can penetrate to the frame and subfloor, accelerating both timber decay and reactive clay movement.
Is cracking more severe in brick veneer or full brick homes?
In terms of structural significance, cracking in full-brick or cavity-brick construction is more serious because the brickwork carries structural load. In a brick veneer home, the brickwork can crack extensively without the structural frame being compromised. However, both types of cracking indicate foundation movement that should be investigated and addressed.