Holes in Brick Mortar — Are Brickwork Voids a Problem in New Homes?
- ClearScope Building Inspections
- Mar 8
- 7 min read
Updated: Mar 10
When inspecting newly built homes across Melbourne growth corridors such as Tarneit, Clyde North and Donnybrook, homeowners sometimes notice small holes in mortar joints, areas of missing mortar, or what appear to be small “blowouts” in brickwork. These issues are most commonly observed during lock-up stage inspections, pre-handover inspections, or occasionally after a homeowner has moved into a recently completed property.
In many cases these small gaps in brick joints are cosmetic workmanship issues rather than structural problems. However, they are still something a professional building inspector will carefully assess to determine whether rectification may be required.
Across new estates in suburbs such as Truganina, Officer, Beveridge, Fraser Rise and Cobblebank, brick veneer construction remains the most common external wall system. Because brickwork forms the visible external finish of the home, homeowners understandably want to ensure it has been installed correctly.
This guide explains what inspectors mean when they refer to brickwork mortar voids, why they sometimes occur during construction, and how they are typically assessed during staged building inspections.
Why Mortar Is Important in Brickwork And Why You Don't Want Holes In Brick Mortar
Mortar plays a critical role in brick construction. While bricks themselves provide strength and durability, the mortar between them is what binds the wall together and distributes loads evenly through the structure.
Mortar performs several important functions:
bonding individual bricks together
distributing structural loads
sealing joints against weather and moisture
helping maintain wall stability
In most modern Melbourne homes, brickwork is installed as brick veneer construction. This means the brickwork forms the external cladding of the house while the structural frame behind it supports the building loads.
Even though the brickwork is not usually the primary structural component, the mortar joints still need to be properly installed to ensure the wall performs correctly and maintains its appearance over time.
Brickwork Mortar Voids — Holes & Blowouts in Brick Joints
The term brickwork mortar voids generally refers to areas where mortar has not fully filled the brick joint or where small holes appear after the brickwork has been laid.
Inspectors may describe these issues as:
mortar voids
mortar blowouts
incomplete mortar joints
These small gaps can appear in a few different ways during the construction process.
During bricklaying, mortar is placed between each brick course and compressed as the brick is positioned. If the mortar is not completely pressed into the joint, a small cavity may remain.
Mortar blowouts can also occur during the cleaning process. Bricklayers often brush or clean brickwork once it has partially set, and in some cases this cleaning process can remove small sections of mortar. In other situations, mortar may shrink slightly as it cures, which can occasionally leave a small void in the joint.
While these issues may look concerning to homeowners at first glance, experienced inspectors understand that small cosmetic mortar imperfections are relatively common in residential construction.
Why Mortar Voids Sometimes Occur During Construction
There are several reasons mortar voids may appear in brickwork during the building process.
Incomplete Filling of Joints
The most common cause is simply incomplete filling of the mortar joint when the brick is laid. Bricklaying is a manual process and small variations can occur.
Mortar Shrinkage
Mortar contains water and cement-based materials which shrink slightly as they cure. In some cases this shrinkage can leave a small depression in the joint.
Cleaning of Brickwork
Brickwork is usually brushed or cleaned after laying to remove excess mortar. During this process, a small amount of mortar can occasionally be removed from the joint.
Weather Conditions
Temperature, wind and humidity can affect how quickly mortar sets. If mortar begins to stiffen too quickly during installation, it may not fully compress into the joint.
Bricklayer Finishing Techniques
Different bricklayers use slightly different finishing techniques when tooling or shaping mortar joints. Occasionally this can leave small imperfections.
In most cases these issues are cosmetic and do not affect the performance of the wall. However, inspectors will still review them to ensure workmanship standards have been met.
Where Inspectors Commonly See Mortar Voids
During new build stage inspections, mortar voids tend to appear in several common locations.
These areas include:
near window openings
beneath window sills
near articulation joints
along slab edges
around weep holes
Openings such as windows and doors can be particularly prone to minor brickwork imperfections because brick cutting and detailing is often required in these areas.
Inspectors differentiate between isolated cosmetic voids and broader workmanship issues.
A small number of minor mortar gaps in a large brick wall may simply be part of normal construction variation. However, if repeated voids are visible across large sections of brickwork, an inspector may recommend repairs to improve workmanship quality.
This approach is similar to how other finishing issues are assessed during inspections. For example, internal finishing issues such as those discussed in Water Pooling in Shower — Is the Floor Fall Incorrect? or Tile Grout Cracking in Bathrooms — Cosmetic Issue or Waterproofing Problem? are also evaluated based on performance and acceptable construction tolerances.
What the Victorian Standards & Tolerances Say
When assessing workmanship issues in residential construction, inspectors often refer to the Victorian Guide to Standards and Tolerances. This guide provides general benchmarks for evaluating construction quality across a range of building elements.
When assessing brickwork mortar joints, inspectors usually focus on three key factors:
performance of the wall system
durability of the construction
overall workmanship finish
Rather than focusing on isolated minor imperfections, inspectors typically assess the overall quality of the brickwork.
Factors that may be considered include:
the size of the mortar void
how frequently voids occur
whether the void affects durability or weather resistance
This approach is consistent with how inspectors evaluate other construction issues, such as concrete workmanship problems like those described in Concrete Slab Defects: Honeycombing or minor movement issues discussed in Hairline Cracks in Walls — Are They Normal in a New Home?
Understanding how construction tolerances are applied can help homeowners interpret inspection findings more clearly. Our article What Does “Within Tolerance” Actually Mean in a New Home Inspection? explains this concept in more detail.
When Mortar Voids May Require Attention
Although many mortar voids are cosmetic, there are situations where inspectors may recommend repairs.
These include situations where:
large holes are visible in joints
repeated voids appear across large sections of brickwork
mortar is missing near structural openings
joints appear poorly compacted
If mortar joints are significantly incomplete, it may reduce the durability of the brickwork or affect its ability to resist moisture penetration.
Fortunately, repairs are usually straightforward.
Common rectification methods include:
repointing mortar joints
patch repairs to affected areas
cleaning and refinishing brickwork
Repointing involves carefully inserting fresh mortar into the affected joints to restore the wall’s appearance and durability.
How Stage Inspections Identify Brickwork Issues Early
One of the advantages of staged building inspections is that brickwork can be reviewed before the home reaches completion. Several inspection stages may identify brickwork issues.
At this stage the structural frame is inspected before brickwork begins. This ensures the structure is correctly prepared for external cladding.
This is when brickwork has typically been completed and windows installed. Inspectors carefully review the brickwork for workmanship issues including mortar voids.
During the final inspection, inspectors check that any previously identified issues have been addressed.
Identifying brickwork issues during construction allows them to be resolved before the homeowner takes possession of the property.
Some construction defects are visible externally during inspections, while others only become apparent inside the home once construction progresses. Moisture marks on ceilings are one example that may appear later in the build process. Our article Water Stains on Ceilings in New Homes — What They Mean During a Stage Inspection explains how inspectors interpret ceiling stains and identify possible moisture sources.
Many workmanship issues such as incomplete mortar joints are first identified during staged building inspections while the home is still under construction. Our guide New Build Stage Inspections — A Complete Guide for Homeowners explains how each inspection stage works, what inspectors assess, and why identifying defects early can help ensure construction quality before handover.
How Brickwork Is Checked During Lock-Up Stage Inspections
During lock-up stage inspections, external wall construction is reviewed carefully to ensure the brickwork has been installed correctly.
Inspectors commonly review:
articulation joints
weep holes
mortar joint finish
brick alignment
cavity ventilation
Articulation joints allow the brickwork to accommodate small structural movements over time. These joints must be correctly positioned and sealed. Weep holes allow moisture to drain from the wall cavity and are an important component of brick veneer construction.
Inspectors also check the alignment of brick courses and the overall finish of mortar joints to ensure the wall presents a consistent appearance. These checks help ensure the brickwork performs properly and meets expected workmanship standards.
Frequently Asked Questions (FAQ)
Are holes in brick mortar normal?
Small mortar imperfections can occur during bricklaying. Inspectors usually assess whether the issue is cosmetic or requires repair.
What causes mortar blowouts in brickwork?
Mortar blowouts can occur due to incomplete filling of joints, cleaning during construction, or natural shrinkage as mortar cures.
Are mortar voids a structural problem?
In most cases small mortar voids are cosmetic and do not affect structural performance. Larger or repeated voids may require repair.
Can mortar joints be repaired?
Yes. Mortar joints can be repaired through a process called repointing, where fresh mortar is inserted into the affected areas.
Do mortar holes allow water into walls?
Brick veneer walls include drainage cavities and weep holes to manage moisture. Small cosmetic voids typically do not compromise this system.
Water entering the brick cavity can also occur around poorly installed window openings. Our article Window Flashing Defects in New Homes — How Water Gets Behind Brickwork explains how inspectors identify flashing issues during construction.
When should brickwork defects be inspected?
Brickwork is usually inspected during the lock-up stage inspection and again at the pre-handover stage to ensure workmanship meets expected standards.
Conclusion
Small holes or gaps in brick mortar joints are something inspectors occasionally observe when assessing newly constructed homes across Melbourne growth areas such as Tarneit, Clyde North and Donnybrook.
In many cases these minor mortar voids are simply cosmetic variations that occur during the bricklaying process. Brickwork is installed by hand, and small imperfections in mortar joints can appear during laying, cleaning or finishing.
During professional stage inspections, inspectors focus on the overall quality and performance of the brickwork, rather than isolated minor imperfections. The size of the voids, how frequently they appear and their location within the wall are all considered when determining whether repairs may be recommended.
If mortar joints are significantly incomplete or repeated across large sections of brickwork, simple rectification methods such as repointing can usually resolve the issue.
For homeowners building in Melbourne’s growing suburbs, staged building inspections provide an opportunity to identify these types of workmanship details early, allowing builders to address them before the home reaches handover.
Understanding how brickwork is assessed can provide reassurance that most minor mortar imperfections are manageable construction details rather than serious structural concerns.
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