Not all pool cracks are the same. Knowing the difference between cosmetic spider cracking and genuine structural cracking can save you unnecessary worry, or help you catch a real problem early.
Spider cracks are fine, web-like, and confined to the surface. Structural cracks are wider, deeper, and often come with other warning signs like water loss or movement.
Understanding which type you're dealing with helps you respond appropriately, without overreacting to something cosmetic or ignoring something that needs attention.
Spider cracks, sometimes called crazing, are fine, web-like hairline cracks that form in the gelcoat surface of a fibreglass pool. They're extremely common, particularly in older pools or those that have seen years of sun and chemical exposure, and they typically don't extend beyond the thin outer gelcoat layer.
While not a structural concern, spider cracks are still worth addressing, since an open crack in the gelcoat can allow water to seep behind the surface over time, which can lead to other issues like blistering or delamination if left unaddressed.
Structural cracks extend beyond the gelcoat surface into the fibreglass shell itself. These are a more serious matter, generally caused by ground movement, hydrostatic pressure, or stress on the pool's structure, and they often come with other signs beyond just the visible crack itself.
Unlike spider cracks, structural cracks can affect the pool's ability to hold water properly and, in more severe cases, its overall structural integrity.
Spider cracks are usually addressed as part of a surface-level repair or resurfacing, since they're cosmetic, the urgency is lower and the fix is more straightforward. Structural cracks need the underlying cause properly identified and addressed, simply filling the visible crack without understanding why it formed risks the same problem recurring.
This is also relevant for insurance purposes in some cases, since the cause of a structural crack (sudden ground movement versus gradual deterioration, for example) can affect how a claim is assessed.
If you need fibreglass repairs in Brisbane or South-East Queensland, get in touch with us today. We're happy to discuss your repair and provide advice on the best solution.
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Disclaimer: The information on this page is general guidance only and is not a substitute for a professional inspection or repair assessment. Pool construction, age, prior repairs and surrounding ground conditions can vary significantly. If you notice structural cracking, water loss or movement, consult a qualified pool repair professional before relying on self-checks alone.