Concrete is one of the most durable materials used in construction because of its strength and resilience. However, it can crack over time which often leaves homeowners wondering if something went wrong. Understanding what causes concrete cracks and how to minimise them is essential when adding a driveway, patio, or walkway to your home. While some cracks like hairline fractures may only be cosmetic, other large cracks that grow or appear in critical areas could indicate deeper issues. This guide covers the main reasons for concrete cracks and gives you practical tips to make sense of quotes, helping you confidently choose a competent Frankston concreter.
Shrinkage: How it Happens and What to Watch Out For

Shrinkage cracks are among the most common types homeowners encounter because of the natural way concrete behaves as it cures. Concrete is a mixture of cement, water, sand, and gravel. As it dries, the water inside the mix evaporates which causes the concrete to shrink. If the shrinkage isn’t managed carefully, it can lead to small cracks appearing on the surface or even within the concrete. This type of crack is common during the initial curing phase so a proactive approach to reduce shrinkage by retaining moisture during the curing phase is essential.
To prevent these cracks, concreters often use control joints—purposeful cuts in the concrete that guide shrinkage cracks along designated lines. These joints help manage the natural stresses that arise from curing, allowing the concrete to crack in a less visible or impactful way. For a detailed look at how control joints work to manage shrinkage, check out this indepth post about control joints. An experienced concreter will also carefully plan the concrete mix and curing practices to reduce the likelihood of shrinkage cracks. When reviewing the quote, look for information on the curing process and mix design, as these details reflect whether the contractor has taken steps to ensure your concrete surface’s longevity. Specific mentions of curing times and joint placements are good indicators of thorough planning.
Temperature Shifts: How Weather Affects Concrete

Frankston’s coastal location means concrete can be subject to a range of temperature fluctuations. Concrete expands when it’s hot and contracts when it’s cold. This movement causes stress on the concrete which eventually leads to cracking if it wasn’t prepared for these shifts.
To address temperature-related cracking, concreters usually add expansion joints, especially in larger slabs. These joints allow the concrete to move as temperatures change without cracking. Timing the pour to avoid extreme weather conditions can also help maintain the concrete’s integrity. Check whether your contractor mentions expansion joints or strategies to manage these temperature shifts. Preparing for these changes shows a commitment to ensuring that your concrete can handle the seasonal weather without cracking over time.
Improper Curing: Why Patience is Key

The curing process is one of the most important steps in concrete installation, directly affecting its strength and durability. If curing is rushed or not managed well, the concrete will weaken and become more prone to cracking. Proper curing involves keeping the concrete moist and at stable temperatures for several days which will help achieve its maximum strength. Think of it as letting bread cool down after baking. If you rush the cooling process, the results can be disappointing. These essential concrete curing tips will provide insight into why proper curing matters.
Experienced concreters know the importance of curing and follow a structured process to retain moisture. Techniques like covering the concrete with plastic sheeting or using curing compounds are standard practices to ensure the concrete reaches its full strength. Your contractor should emphasise the curing times and methods as these are crucial steps in creating crack-resistant concrete.
Heavy Loads: Know Your Concrete’s Limits

Frankston’s driveways, patios, and even backyard sheds are popular places for concrete, but it’s essential to make sure each slab is designed for its intended use. While concrete is strong, every slab has its load limits. For example, excessive weight from a heavy truck on a residential driveway or a fully loaded shed can cause cracking if the concrete hasn’t been constructed to handle it.
To avoid cracks from heavy loads, talk with your concreter about how you plan to use your concrete surface. If it’s a high-traffic area, reinforcements like rebar or wire mesh can increase its load-bearing capacity. Thicker concrete can also help prevent cracking under weight. When reviewing your quote, check if the contractor includes reinforcements and thickness adjustments in areas expected to handle more weight, especially for slabs that require extra durability.
Poor Drainage and Soil Erosion: The Risk Beneath Your Concrete

Without proper drainage, water can pool and eventually erode the soil underneath the concrete, leaving sections of concrete unsupported. Over time, the presence of heavy loads (like from your car) can cause sections of concrete to crack. Especially in coastal areas with frequent rainfall, proper drainage is of great importance.
To address these hidden risks, professional concreters might include a drainage plan to ensure water flows away from concrete surfaces. They may use slight grading, drain pipes, or other techniques to control water flow. Proper soil preparation such as compacting the soil before pouring also helps reduce the risk of erosion and settling. In your quotes, look for mentions of drainage solutions and soil prep steps as these are often-overlooked factors that play a big role in preventing future cracks and keeping your concrete investment strong.
Conclusion
Concrete cracking is a common issue but with the right concrete contractor and planning, it can be minimised or avoided altogether. Understanding the reasons for cracks and knowing what to look for in contractor quotes will help you make an informed decision and get the best value for your investment. When hiring a contractor, pay attention to factors like curing processes, reinforcements, and drainage solutions. These are good signs that your contractor is invested in quality and durability.
If you need a professional and experienced concreter in Frankston, you can approach us! Call us today so we can discuss your planned concreting project and see how we can give you peace of mind and a solid foundation for your outdoor spaces.