cracks in concrete
  • May 16, 2023
  • Effective Building
  • 0

Concrete is a highly durable and versatile building material used in various construction projects. However, cracks in concrete can be a common problem that homeowners and builders encounter. While some cracks may be superficial and not indicate structural issues, others can indicate more significant problems. 

In this article, we will explore the causes of concrete cracks and how to determine if they are structural.

Types of Concrete Cracks 

Before determining whether a crack is structural, it is essential to understand the different types of concrete cracks. The three most common types of cracks are shrinkage, settlement, and structural.

Shrinkage Cracks

Shrinkage cracks occur when the concrete dries and contracts, causing it to crack. This type of crack is typically shallow and runs along the surface of the concrete. While shrinkage cracks can be unsightly, they are generally not a cause for concern and do not affect the structural integrity of the concrete.

Settlement Cracks

Settlement cracks occur when the soil underneath the concrete settles or shifts, causing the concrete to crack. This type of crack is typically wider at the top and narrows as it extends deeper into the concrete. Settlement cracks can indicate a more significant problem, such as inadequate soil compaction or drainage issues.

Structural Cracks

Structural cracks occur when the concrete is subjected to excessive weight or pressure. These cracks can be more severe and deeper than shrinkage or settlement cracks and may run diagonally across the concrete. Structural cracks can compromise the integrity of the concrete and can be a sign of a more significant structural issue.

Causes of Concrete Cracks 

Several factors can contribute to concrete cracks. Some of the most common causes include:

Insufficient Reinforcement

Reinforcing steel bars or wire mesh provides additional strength to concrete. Insufficient reinforcement can cause concrete to crack underweight or pressure.

Poor Concrete Mix

A poorly mixed concrete mix can lead to cracking. Too much water in the mix can cause shrinkage cracks, while too little water can cause the concrete to be brittle and prone to cracking.

Soil Conditions

Soil conditions can cause settlement cracks. Poorly compacted soil or soil prone to shifting can cause the concrete to crack.

Temperature Changes

Extreme temperature changes can cause concrete to expand and contract, leading to cracking.


Excessive weight or pressure on concrete can cause structural cracks.

Determining if Concrete Cracks are Structural 

Determining whether concrete cracks are structural is essential for identifying potential problems and determining the appropriate course of action. While some cracks may be cosmetic, others may indicate more severe problems.

The following signs may indicate that a crack is structural:

  • The crack is wider than ¼ inch
  • The crack is deep and runs through the entire thickness of the concrete
  • The crack is diagonal
  • Other signs of structural damage, such as sagging or uneven floors or walls accompany the crack

If you notice any of these signs, it is essential to consult a structural engineer or a professional concrete contractor. They can assess the severity of the damage and recommend the appropriate course of action, such as repairing or replacing the concrete.

Preventing Concrete Cracks 

Preventing concrete cracks is essential for maintaining the integrity of your concrete structures. Here are some tips for preventing concrete cracks:

  • Use reinforcement: Reinforcing steel bars or wire mesh can provide additional strength to concrete and help prevent cracking.
  • Proper installation techniques, such as proper soil compaction and appropriate curing times, can help prevent cracks.
  • Regular maintenance: Regular maintenance, such as sealing cracks and maintaining proper drainage, can help prevent cracking.


If you are experiencing cracks in your concrete and are unsure if they are structural, it is important to consult a professional. Effective Building and Consultancy is a reputable consulting firm that provides building inspection and consultation services.

Our team of experts can inspect your concrete structures and assess the severity of any cracks or damage. We use advanced techniques and equipment to accurately determine if the cracks are superficial or indicative of more significant problems.

If we find that the cracks are structural, we can recommend the appropriate course of action, such as repairing or replacing the concrete. We also provide preventive measures to help prevent future cracking and ensure the longevity and safety of your concrete structures.

Don’t wait until a small problem turns into a significant issue. Contact Effective Building and Consultancy at 02 9613 3353 or email us at today to schedule an inspection and ensure the safety of your concrete structures.

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About Elie Farah

Elie Farah is a Building Consultant with over 25 years of experience in the property industry. Elie has specialised knowledge in development acquisitions, blue-chip properties and inspections, as well as flood-affected and waterfront properties, heritage buildings, bushfire management and existing use rights.

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