We've encountered a growing number of serious defects in new residential builds, caused by poor bricklaying and improper brick cleaning practices. In some cases, these issues have led to significant structural failures - including brick wall collapses that have resulted in injury or worse.
As licensed builders, and experts in the brick cleaning, staining and mortar field, we understand how critical it is to get these elements right from the start, and we’re committed to helping building companies identify and resolve these faults with accuracy and confidence.
Recommended Test - Chemical Testing
As part of our service, we coordinate professional chemical analysis of mortar through trusted, accredited laboratories. This type of testing is used to identify the exact mix proportions within a mortar sample - breaking down the Cement, Lime, and Sand content, and detecting any additives such as plasticizers, thickening agents, or waterproofing chemicals. It also highlights potential contaminants, including overuse of brick-cleaning acid, which is one of the most common causes of mortar deterioration we see in new builds.
This analysis verifies whether the mortar complies with the National Construction Code (BCA/NCC) and AS3700 (Masonry Code), and serves as a powerful tool in resolving disputes where workmanship is in question. We often prepare expert reports based on these findings for use in VCAT hearings and legal proceedings. Several leading residential building companies also engage us to manage this process as part of their ongoing QA/QC checks—something we recommend builders do regularly to ensure long-term structural integrity.
One major advantage of chemical mortar testing is that it can be carried out during construction, using fresh mortar directly from the site. This makes it a proactive quality assurance measure, rather than a reactive one after damage has occurred.
This testing also helps determine whether the fault lies with the bricklayer, the cleaning process, or the materials used—bringing clarity to otherwise complex issues.
In addition to new builds, we also arrange for heritage-based testing of mortar and render for restoration and conservation work, ensuring compatibility and historical accuracy in repairs.
About the Scratch Test (Durability Test):
While the scratch test is sometimes used in the field, we find it has major limitations, and indication - at best. It was designed primarily for flush-joint mortar on smooth-faced bricks or blocks, and becomes unreliable on raked joints or uneven surfaces.
Results can vary significantly depending on the operator, making it inconsistent for conclusive assessment.
Most importantly, it provides no insight into the actual material composition of the mortar. In cases where performance is poor, only chemical analysis can uncover the root cause.
In fact, we've seen cases where extremely weak mortar still passes the scratch test - making it unreliable as a quality control tool on its own. At best, it should be used in conjunction with chemical testing, not as a replacement.
