Concrete spalling

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Concrete Spalling: Causes, Risks & Repair Solutions For Ageing Buildings

Concrete spalling

Concrete spalling can be an early warning sign that an ageing building needs closer attention. For building owners and strata managers, visible cracking, flaking or exposed reinforcement may indicate damage beneath the surface.

This guide explains what causes spalling, the risks it can create and how inspection and repair are typically approached.

What causes concrete spalling in ageing buildings?

Concrete spalling often develops when moisture reaches embedded steel reinforcement. As the steel corrodes, it expands and places pressure on the surrounding concrete, causing cracks and pieces of concrete to break away.

Other contributing factors can include carbonation, salt exposure and construction defects. Balcony concrete spalling can also develop where failed waterproofing or persistent moisture allows corrosion-related damage to progress.

Why can concrete spalling become a safety and durability issue?

The severity depends on the location and extent of the damage. Common concerns include:

  • Loose or falling concrete in occupied areas
  • Exposed reinforcement becoming more vulnerable to corrosion
  • Damage extending beyond the initially affected area
  • The need for further structural assessment in more severe cases

Early investigation can help establish the extent of the problem before repair works are planned.

How are spalling repairs typically approached?

The right repair method depends on the cause, location and extent of the damage. After inspection, the rectification scope may include:

  • Concrete cancer repair: Addresses spalling linked to reinforcement corrosion and restores damaged concrete around affected steel.
  • Remedial concrete repair: Removes unsound concrete and reinstates damaged areas.
  • Waterproofing and drainage works: Manage moisture ingress contributing to ongoing damage.
  • Reinforcement treatment: Treats corroded steel where required by the repair specification.
  • Larger-scale reconstruction: Rebuilds areas where damage extends beyond localised repairs.

Facade concrete repairs and broader building remediation projects may also require coordination between consultants, contractors and other stakeholders throughout the works. 

Manage concrete spalling with Canopy Constructions

Canopy Constructions provides remedial construction and project management support for ageing buildings. We help coordinate rectification works with a focus on clear communication, quality delivery and practical project outcomes.

Explore our services or contact us to discuss your building’s concrete repair requirements.