What Can Cause A Fibreglass Pool to Crack?


Fibreglass pools have gained significant popularity in recent years due to their exceptional durability, ease of installation, and remarkably low maintenance requirements. However, as with any product, it’s important to note that they are not entirely impervious to damage. One common issue that pool owners often encounter is the occurrence of cracking, which can be caused by various factors such as ground movement, extreme temperature fluctuations, or improper installation techniques. Being aware of these potential challenges and taking proactive measures to address them can help ensure the long-term enjoyment and longevity of your fibreglass pool.

Causes of Cracks in Fibreglass Pools

Improper Installation

One of the most prevalent causes of cracks in fibreglass pools is due to improper installation. When a fibreglass pool is installed, it is crucial to ensure that it is placed on a solid and level surface. This is essential to ensure that the pool can effectively withstand the weight of the water as well as the individuals utilising it. In instances where the installation is poorly executed or the base is not adequately solid, the pool may shift or experience movement, ultimately leading to the development of cracks. Therefore, it is imperative to prioritise a proper and careful installation process to prevent such issues from arising. This emphasises the importance of making sure you find a trusted and experienced pool building professional to install your fibreglass pool. It’s crucial that you check references, qualifications, previous work and ask around before making a decision, you can usually rely on the internet to get you helpful information.

Extreme Weather Conditions

Extreme weather conditions, especially freezing temperatures, can have significant and negative impacts on a fibreglass pool. This phenomenon occurs when water freezes, causing it to expand and exert pressure on the pool walls. If the pool has not been adequately winterised or lacks proper precautions, the expanding ice can lead to the formation of cracks in the fibreglass structure. These cracks can compromise the overall integrity of the pool, potentially resulting in the need for costly repairs. It is crucial to take appropriate measures to protect the fibreglass pool from such damage, ensuring its longevity and functionality.

Sun Exposure

Prolonged exposure to the sun’s harmful UV rays can gradually cause the fibreglass material to become increasingly brittle over time, making it more susceptible to unsightly cracks and damage. This effect is particularly noticeable in plunge pools sydney that are not diligently maintained and lack the added protection of a reliable pool paint or durable gel coat layer. By ensuring proper maintenance and applying suitable protective measures, such as a high-quality pool paint or gel coat, you can help safeguard your pool against the damaging effects of sun exposure and maintain its pristine condition for years to come.

Ground Movement

Ground movement is another significant factor that can lead to cracks in a fibreglass pool. This can occur due to a variety of reasons such as soil erosion, seismic activity, or even heavy traffic nearby. These factors can cause the earth beneath the pool to shift, unsettling the pool’s foundation and causing it to fracture. Special attention should be given to the type of soil and the geological profile of the location before installing a fibreglass pool. If the ground is prone to movement, appropriate measures like soil stabilisation or the use of special installation techniques may be required to prevent potential damage.

Preventing Cracks in Fibreglass Pools

Regular Maintenance

Regular maintenance is crucial to prevent cracks and ensure the longevity of your pool. This involves conducting regular inspections to identify any signs of damage or wear, such as cracks or leaks. Additionally, it is important to clean the pool regularly, removing debris and ensuring proper filtration. Maintaining the correct chemical balance in the water is also essential to keep it safe and hygienic for swimming. By diligently performing these tasks, you can extend the lifespan of your pool and enjoy it for years to come.

Proper Installation

As mentioned earlier, improper installation can lead to cracking and other potential issues. Therefore, it is crucial to ensure that the pool is installed by a certified professional who has experience in handling the specific requirements of the pool type. Additionally, it is important to properly prepare the ground by ensuring it is level, free from debris, and adequately compacted. Taking these measures will not only ensure the longevity of the pool but also provide a safe and enjoyable swimming experience for years to come.

Adequate Winterisation

For pools located in regions where temperatures drop below freezing, proper winterisation is crucial. This process involves draining the pool to a safe level, adding specific winter chemicals to maintain its condition, and carefully covering it with a durable winter pool cover. By taking these necessary steps, pool owners can effectively protect their pool from the harsh elements of winter, ensuring its longevity and optimal performance when the warmer season returns.

Use of Pool Covers

Employing the use of pool covers when the pool is not in use is another proactive measure to prevent cracks in fibreglass pools. Not only do they protect the pool from debris and potential contaminants, but a high-quality, UV-resistant pool cover can also help shield the pool surface from the damaging effects of long-term sun exposure. This additional layer of protection can help maintain the structural integrity of the fibreglass, significantly reducing the risk of cracking over time. For the best results, it’s recommended to choose a pool cover that’s specifically designed for fibreglass pools and manufactured from UV-resistant materials.


Fibreglass pools, despite their inherent durability and low maintenance requirements, can still succumb to cracking due to several factors including improper installation, extreme weather conditions, and prolonged sun exposure. However, this risk can be significantly mitigated through regular maintenance, proper installation, and adequate winterisation measures. By understanding these potential issues and taking the necessary preventative steps, pool owners can greatly extend the lifespan of their fibreglass pools, ensuring they remain a place of enjoyment and relaxation for many years to come.

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