How Concrete Spalling Leads to New Building Leaks

Zeke Stankov • March 26, 2026
concrete spalling

Construction today moves fast. Multiple trades work at the same time, and deadlines are tight. Small mistakes made during construction can stay hidden until water finds its way inside. 

Across Australia, more newly built apartments and commercial buildings are showing early signs of water ingress. Leaks are appearing within the first few years of completion. Sometimes the problems start even earlier.

Water that enters a structure does not stay harmless for long. It can damage finishes, weaken structural elements, and eventually lead to issues like concrete spalling. At that stage, professional concrete repair contractors are often needed to stop further deterioration and restore structural safety.

Understanding why these issues occur is the first step toward preventing them. 

Poor Waterproofing Application 

Waterproofing is one of the most critical parts of construction. It protects bathrooms, balconies, rooftops, and basements from water penetration. When done properly, it forms a continuous barrier that keeps moisture out of the building structure.

However, when installation is rushed or poorly executed, this barrier can fail much sooner than expected.

  • Rushed installation to meet tight construction deadlines

Construction schedules often leave little room for delays. Waterproofing systems require proper curing times and careful installation. When projects run behind schedule, this stage is sometimes rushed.

A membrane that has not cured properly becomes weak. Over time, it may crack or separate from the surface. Once that happens, water can slowly seep through the building envelope.

  • Inadequate surface preparation before membranes are applied

Before any waterproof membrane is installed, the surface beneath it must be clean, dry, and stable. Dust, loose concrete, or moisture can prevent the membrane from bonding properly.

If preparation is skipped or done poorly, the waterproof layer may lift or blister. Even small gaps can allow water to penetrate the structure.

  • Application by unskilled labor rather than certified waterproofing specialists

Waterproofing systems are technical products. They require trained installers who understand correct thickness, detailing, and curing requirements.

In some projects, installation is handed to workers without specialised training. This increases the risk of thin coatings, missed joints, or incomplete coverage. These errors may not be visible at first, but they often lead to leaks within a short period.

Will it harm your building if you delay repair works?

 Design and Architectural Flaws 

Modern buildings often feature bold designs. Large balconies, rooftop gardens, and complex façades are now common in residential and commercial projects. While these features look impressive, they can also introduce new waterproofing challenges.

  • Complex modern designs that prioritize aesthetics over efficient water drainage

Design choices sometimes focus more on appearance than practicality. Flat surfaces, hidden drainage points, and decorative architectural features can trap water. Without careful planning, these areas become vulnerable to long-term moisture exposure.

  • Insufficient “fall” (slopes) on balconies and rooftops

Balconies and rooftops should have a slight slope to allow water to drain away. This slope is called the “fall.” 

When the fall is insufficient, water collects on the surface. Standing water increases pressure on the waterproofing layer and eventually finds weak points where it can seep through.

  • Failure to account for building movement

Buildings naturally move over time. Temperature changes, structural loads, and ground movement can cause slight shifts in the structure.

If waterproofing systems are not designed to accommodate this movement, membranes may crack or tear. Once the protective layer breaks, water infiltration begins. 

Use of Inferior Materials 

Material quality plays a major role in building durability. Waterproofing membranes, sealants, and protective coatings must withstand years of exposure to weather and structural movement.

When inferior materials are used, the risk of early failure increases significantly.

  • Choosing low-grade membranes or sealants to cut initial construction costs

Developers often face pressure to control costs. In some cases, lower-grade materials are selected to reduce upfront expenses.

While this may save money during construction, the long-term consequences can be severe. Cheap membranes tend to degrade faster, especially under constant moisture and UV exposure.

  • Material incompatibility

Not all construction materials work well together. Some sealants do not bond properly with certain substrates such as concrete, metal, or tile adhesives.

When incompatible products are used, bonding failure can occur. This allows water to travel beneath the membrane and reach structural components, sometimes triggering concrete spalling that requires intervention from experienced repair contractors. 

Lack of On-Site Oversight 

Quality control on construction sites is essential. Even well-designed systems and quality materials can fail if installation is not properly monitored. Without strong supervision, mistakes may go unnoticed until after the building is completed.

  • Missing or poorly executed flood testing

Flood testing is a simple but important step in waterproofing. Water is temporarily held over a waterproofed surface to check for leaks before finishes like tiles are installed.

If flood testing is skipped, hidden defects remain undetected. Once tiles and finishes are installed, locating and fixing the problem becomes far more complex.

  • Damage caused by other trades

After waterproofing is installed, other trades often work in the same area. Electricians, tilers, and plumbers may unintentionally damage the membrane while completing their tasks.

A small puncture in the waterproofing layer is enough to allow water penetration. Over time, this can lead to structural deterioration that requires specialised contractors to repair affected areas. 

Environmental Factors 

Even when construction is done correctly, environmental conditions can affect waterproofing performance. Weather and temperature changes place constant stress on building materials.

These forces can accelerate small defects that already exist within the structure.

  • Extreme weather during the curing process

Waterproof membranes and sealants require stable conditions to be cured properly. Heavy rain, high humidity, or sudden temperature changes can interrupt this process. If curing is incomplete, the membrane may not develop its full strength.

  • Thermal expansion and contraction

Buildings expand and contract as temperatures change. In coastal regions or areas with strong sunlight, this movement can be significant.

Repeated expansion and contraction place stress on joints and membranes. Over time, this movement can create cracks that allow moisture to enter the structure.

Understand what is concrete sweating

Contact Concrete Repair Contractors 

Water leaks rarely fix themselves. What begins as a small defect can grow into a major structural issue. Moisture trapped within concrete can lead to corrosion and spalling, which weakens structural elements and requires costly repairs. 

Regular inspections help identify early warning signs before significant damage occurs. Experienced contractors can assess waterproofing systems, detect hidden moisture issues, and recommend practical repair strategies. 

If your new building is showing signs of water ingress, early action is essential. A detailed inspection can reveal the source of the problem and prevent further damage.

Southern Remedial specialises in diagnosing structural defects and delivering reliable repair solutions across Australia. Our experienced team can assess your building, identify risks, and provide practical remediation strategies that protect the structure for the long term.

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The breakthrough came when polymer chemistry and nanotechnology entered the scene. Instead of a simple surface coating, modern systems bond at a molecular level. They flex with the building, resist UV and salt, and seal even microscopic pores. These advances shift waterproofing from basic protection to lasting defence. Why waterproofing your basement is essential for long-term property value . How Modern Waterproofing in Illawarra Actually Works Today’s waterproofing doesn’t rely on layers of paint or tar. It works by sealing at the molecular scale. At its heart, molecular-level sealing means using materials that bond deeply with concrete or masonry. These sealants flow into tiny pores, capillaries, and cracks too small for the naked eye. Once cured, they block water from ever entering. One powerful method uses polyurethane or epoxy injection technology. For example, epoxy injection fills structural cracks in concrete and bonds within the crack itself. 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We hope you enjoy reading this blog post!

If you need specialist remedial building works in Wollongong, Sydney, or the South Coast, look no further than Southern Remedial Solutions. We use industry-leading technologies to deliver high-quality solutions to our clients.