Do cracks need to be repaired before pool resurfacing?

Yes. Cracks should be assessed to understand their cause and repaired appropriately before a new surface is applied. Applying resurfacing over unaddressed structural or movement-related cracks is likely to result in premature failure of the new surface. The repair approach depends on the type and cause of the crack — surface crazing is treated differently from structural cracking or movement-related damage.

How do I know if my pool is leaking?

Common signs of a pool leak include: ongoing water loss beyond normal evaporation (typically more than 25mm per week in still conditions), needing to top up the pool frequently, wet ground around the pool without rain, air in the filtration system, or cracks with associated water loss. If you suspect a leak, it should be assessed and the source identified before resurfacing proceeds, as resurfacing over an active leak is unlikely to resolve the water loss.

Can osmosis in a fibreglass pool be repaired?

Yes. Osmosis in fibreglass pools can be treated — the pool needs to be drained, the affected surface areas ground back, the substrate dried, repair materials applied, and a new surface system applied over the prepared substrate. The extent of treatment required depends on how widespread the osmosis is. Localised osmosis may be repairable with targeted treatment; widespread osmosis generally warrants a full resurface.

What causes cracks in concrete pools?

Cracks in concrete pools can have several causes: normal concrete shrinkage during curing, thermal expansion and contraction over many years, ground settlement, tree root intrusion, hydrostatic pressure, or movement in expansive soils. In Toowoomba, black soil ground movement is a relevant factor in crack assessment. The cause of cracking should be understood before repair proceeds — surface crazing is different from structural cracking, which requires more significant intervention.

Does ground movement in Toowoomba affect pool surfaces?

Parts of the Toowoomba region have expansive black soil that moves seasonally with moisture levels. This ground movement can contribute to cracking in pool shells, coping, and surrounding structures. Any cracks in a pool in the Toowoomba area should be assessed to understand whether they are cosmetic surface cracks or potentially movement-related before resurfacing is applied. Covering active movement-related cracks with new resurfacing is unlikely to produce a lasting result.

Do I need a pool inspection before getting a quote for repairs?

For most crack, leak, osmosis, and structural repair work, an on-site inspection is needed before the work can be accurately assessed and quoted. The nature and extent of the problem can only be properly determined by inspecting the pool in person — particularly for cracks, where the cause and depth need to be assessed to determine the appropriate repair approach.

Pool Repairs Toowoomba | Cracks, Leaks & Pre-Resurfacing Assessment

Why Assessment and Repairs Come Before Resurfacing

Pool resurfacing applies a new finish to the interior surface of the pool. For that finish to last, it needs to be applied to a sound, stable, and properly prepared substrate. If underlying problems — cracks, active leaks, osmosis, hollow spots, or movement-related damage — are covered over without being addressed, the new surface is likely to fail prematurely regardless of the quality of the resurfacing system used.

A resurfacing provider will assess the pool's condition before committing to a resurfacing quote. This assessment identifies what needs to be repaired before the new surface is applied, and ensures the resurfacing scope and cost accurately reflect what the job actually requires.

Common Issues Requiring Assessment Before Resurfacing

Any of the following conditions should be assessed — and where necessary repaired — before pool resurfacing proceeds.

Leaks

A pool that is losing water beyond normal evaporation should be assessed for a leak before resurfacing. The source of the leak — whether in the pool shell, fittings, plumbing, or another point — needs to be identified and addressed before a new interior surface is applied.

Resurfacing the interior of a leaking pool is unlikely to stop the leak if the source is not in the interior surface. In some cases, the leak source can only be properly identified when the pool is drained — which makes the pre-resurfacing period a practical time for leak assessment.

Common signs of a leak: ongoing water loss beyond normal evaporation (typically more than 25mm per week in still, warm conditions), needing to top up frequently, wet ground around the pool shell, or air in the filtration system.

Cracks

Cracks in pool surfaces range from cosmetic surface crazing through to structural damage requiring significant repair. The key distinction is the cause:

Surface crazing — fine network of shallow cracks in the finish layer; typically cosmetic and addressable during resurfacing preparation
Settlement cracks — from ground movement or settling; should be assessed to understand whether movement has stabilised
Structural cracks — extending through the pool shell; require more significant repair before resurfacing
Active movement cracks — associated with ongoing ground movement; need careful assessment and appropriate repair strategy

The repair approach depends entirely on the crack type and cause. Applying new resurfacing over an active or structural crack without addressing the underlying cause is unlikely to hold.

Osmosis and surface delamination (fibreglass)

Osmosis blistering in fibreglass pools and delamination of previously applied coatings both need to be addressed during surface preparation. Osmosis requires the pool to be dried, affected areas treated, and the substrate repaired before a new surface can be applied. Delaminated coatings need to be fully removed to provide a sound bonding surface.

See the fibreglass pool resurfacing page for more detail on osmosis assessment and treatment.

Hollow spots under concrete or pebblecrete

In concrete and pebblecrete pools, hollow spots can develop beneath the surface layer — areas where the plaster, render, or pebblecrete has separated from the underlying concrete shell. Hollow areas can be identified during surface preparation by sounding the surface.

Applying new resurfacing over hollow areas is likely to result in the new surface cracking or delaminating in those areas as the hollow spot continues to move or deteriorate beneath it. Hollow sections should be removed and re-applied on a sound substrate before resurfacing proceeds.

Coping and tile deterioration or movement

Loose, cracked, or lifting coping and waterline tiles should be assessed before resurfacing. Coping that is lifting or moving may indicate ground movement or substrate issues beneath the pool edge that are worth understanding before the pool is resurfaced. Addressing coping and tile work at the same time as resurfacing is generally more efficient and cost-effective than scheduling separately.

Plumbing and equipment at the time of drain

With the pool drained for resurfacing, it is a practical time to assess the condition of pool fittings, skimmer boxes, return jets, drain covers, and any other through-shell fittings. Fittings that are aged, deteriorating, or leaking should ideally be addressed before the pool is refilled with a new interior surface. Discuss this with your resurfacing provider during the assessment.

Ground Movement in Toowoomba — What It Means for Pool Cracks

Parts of the Toowoomba region and the Darling Downs have expansive black soil profiles that move seasonally as moisture content changes. This type of ground movement can contribute to cracking in pool shells, coping, pool surrounds, and nearby structures.

Cracks in pools located in areas with black soil should be assessed with ground movement in mind. A crack that appears minor may be associated with ongoing seasonal movement — in which case a repair that doesn't account for this movement is likely to reopen. Conversely, many cracks in older Toowoomba pools are simply due to normal concrete ageing and are not associated with active movement.

The distinction matters when planning a resurfacing project. An on-site assessment by a qualified provider who understands local soil conditions is the most reliable way to determine the nature and significance of cracking in your pool. For pools with significant or complex cracking, specialist structural or geotechnical assessment may also be worth considering.

Hydrostatic Pressure in Concrete Pools

Below-ground concrete pools in areas with high water tables or clay-rich soils can be subject to hydrostatic pressure — upward pressure from groundwater beneath the pool floor when the pool is drained. In severe cases, this pressure can cause the pool floor to lift or crack if the pool is drained without appropriate pressure relief.

This is a relevant consideration for pool resurfacing because the pool needs to be drained for the work to proceed. A qualified resurfacing provider will assess whether hydrostatic pressure is a concern for your pool and take appropriate precautions during the drain-down process.

If you are aware that your pool has experienced hydrostatic issues previously — or if you notice wet ground around the pool shell after rain — mention this when submitting your enquiry.

The Inspection Process

For pools with visible cracking, suspected leaks, osmosis blistering, or other structural concerns, an on-site inspection is generally needed before resurfacing can be accurately scoped and quoted.

A pre-resurfacing inspection typically involves:

Visual assessment of the pool surface — cracks, blistering, delamination, staining, wear
Checking for hollow sections by sounding the surface
Assessing coping and waterline tile condition
Reviewing visible fittings, skimmers, and through-shell penetrations
Discussing any water loss history or leak concerns
Noting site access and drainage logistics for the resurfacing project

Where a leak is suspected, further investigation — such as a leak detection assessment — may be needed before the resurfacing scope can be finalised. Your resurfacing provider can advise on what is needed once they have seen the pool.

Submitting detailed information about your pool's condition — including a description of any cracking, water loss, or surface issues, and photos where possible — helps make the most of an initial enquiry before an inspection is arranged.

Pool Repair and Resurfacing Cost — Toowoomba

The cost of repairs before resurfacing depends on what is found during the assessment — the type, extent, and cause of any cracking, osmosis, delamination, or structural issues identified. Repair costs form part of the overall resurfacing project cost, and are generally included in a resurfacing quote once the pool's condition has been assessed.

Indicative price ranges for pool resurfacing in Toowoomba — including typical cost drivers — are available in the cost guide. An on-site assessment is the starting point for accurate pricing where repairs are involved.

View Cost Guide

Pool Repairs FAQs — Toowoomba

Yes. Cracks should be assessed to understand their cause and repaired appropriately before a new surface is applied. The repair approach depends on the type and cause of the crack. Surface crazing can often be addressed during standard preparation. Structural or movement-related cracks require more significant assessment and repair. Applying resurfacing over unaddressed structural cracks is likely to result in premature failure of the new surface.
Common signs of a pool leak include: ongoing water loss beyond what normal evaporation would account for (typically more than 25mm per week in still, warm conditions without heavy splash-out), needing to top up the pool water frequently, wet ground around the pool shell without rain, air in the filtration lines, or visible cracks accompanied by water loss. If you suspect a leak, include this in your enquiry so it can be factored into the assessment.
Yes. Osmosis in fibreglass pools can be treated — the pool is drained and dried, the affected surface areas ground back, repair materials applied, and a new surface system applied over the prepared substrate. The extent of treatment depends on how widespread the osmosis is. Localised osmosis may be treatable with targeted repair. Widespread osmosis generally warrants a full resurface. See the fibreglass resurfacing page for more detail.
Cracks in concrete pools can result from: normal concrete shrinkage during the original curing process, thermal expansion and contraction over many years, ground settlement, expansive soil movement (particularly relevant in parts of the Toowoomba region), tree root intrusion, or hydrostatic pressure. The cause of cracking determines the appropriate repair approach — surface crazing from shrinkage is treated very differently from structural cracking caused by ground movement.
Parts of the Toowoomba region have expansive black soil that moves seasonally with moisture levels. This ground movement can contribute to cracking in pool shells, coping, and pool surrounds. Any cracks in a pool in the Toowoomba area should be assessed with this in mind — to understand whether they are cosmetic, from normal concrete ageing, or potentially associated with ongoing ground movement. Covering movement-related cracks without addressing the underlying cause is unlikely to produce a lasting result.
For most crack, leak, osmosis, and structural repair work, an on-site inspection is needed before the work can be accurately assessed and quoted. The nature and extent of the problem generally can only be determined by inspecting the pool in person. Providing detailed information about your pool — including a description of the issues and photos — helps make the most of an initial enquiry before an inspection is arranged.

Pool Repairs Toowoomba – Before Resurfacing Assessment