Fibreglass Removal vs Concrete Crushing: How Pool Demolition Actually Differs

Homeowners often lump pool removal into a single category, “the pool comes out”, without understanding that fibreglass and concrete pools require entirely different approaches. The machinery is different, the timeline is different, the waste streams are different, and the complications that arise are different. If you’re comparing quotes or trying to understand what’s involved in your specific removal, knowing these differences matters.

Quick Answer (BLUF)

Concrete pool removal uses a hydraulic rock hammer to break the reinforced shell in place, then excavates and removes the rubble, a process driven by an excavator with a breaker attachment over one to two days. Fibreglass pool removal uses an excavator to either lift the intact shell from the ground (where access allows) or cut it into sections for removal, the shell itself isn’t broken, just separated from the ground and cut up. The waste, the machinery attachments, the skill requirements, and the complications that arise are fundamentally different.

The Concrete Pool: A Reinforced Structure That Must Be Demolished

A concrete pool (gunite, shotcrete, or hand-poured) is a reinforced concrete structure, steel rebar cage encased in a concrete shell, typically 150-250mm thick. It cannot simply be lifted out. The only way to remove it is demolition: breaking it apart in place.

The process:

1. The excavator mounts a hydraulic breaker attachment (rock hammer)
2. The operator systematically breaks the shell from one end to the other, breaking walls into the pool cavity, then breaking the floor
3. The hydraulic breaker operates at high impact frequency, fracturing concrete around the rebar cage
4. As sections break, the excavator bucket switches between breaking mode and scooping mode to move rubble
5. Steel rebar is exposed during breaking and must be separated from concrete, either by hydraulic shears or manual cutting
6. Broken concrete is sorted into: usable sub-base material (smaller fragments), excess rubble (larger or contaminated pieces), and steel (rebar for metal recycling)

Typical machinery:

• 8-14 tonne tracked excavator
• Hydraulic breaker attachment (typically 800-1,500 kg class hammer)
• Quick-hitch or manual changeover to bucket for sorting and moving rubble
• Tipper trucks for material removal

Timeframe on site (for shell work): 6-12 hours for a standard 8m × 4m concrete pool, not including coping removal and backfill.

What can go wrong:

• Encountering old, dense (70+ MPa) concrete that resists the breaker and significantly slows progress
• Hitting unexpected buried structure (old pool fittings, buried pipes, boulders)
• Pebblecrete generating significant silica dust requiring dust suppression
• Rebar that’s more extensive than expected, requiring additional cutting time

The Fibreglass Pool: A Shell That Can (Sometimes) Be Lifted

A fibreglass pool is a single-piece glass-reinforced plastic (GRP) shell, typically 8-12mm thick. It was manufactured off-site and craned into a prepared excavation. Unlike concrete, the shell was not formed in place, which means it can, in principle, be removed intact.

However, in practice, intact removal is only possible when:

• The pool deck has not been built against the pool wall on all sides (the shell needs a clear lift path)
• No significant concrete collar or beam exists around the shell rim
• The shell is not deeply embedded in rock or heavily compacted material that grips it
• A crane or large excavator with sufficient reach can be positioned adjacent to the pool

When intact removal isn’t possible (the more common case on established Southern Highlands properties where paving runs up to the pool edge), the fibreglass shell is:

1. Cleared of coping and surrounds
2. Cut into sections using angle grinders, reciprocating saws, or carbide-tipped cutting discs
3. Each section lifted out and loaded for disposal

Typical machinery:

• 5-14 tonne tracked excavator (lighter machine sufficient; no need for hydraulic breaker)
• Cutting equipment (angle grinders, reciprocating saws, sometimes a diamond-blade disc cutter)
• Rigging equipment if attempting intact lift
• Tipper trucks for section removal

Timeframe on site (for shell work): 4-8 hours for a standard fibreglass pool, faster than concrete because no breaking is required, but cutting still takes time.

What can go wrong:

• Discovering the shell has a concrete collar that must be broken before shell can be cut
• High groundwater causing the empty shell to try to float before machinery can lift it (the float risk)
• Buried anchor points (some older fibreglass pools were anchored to concrete footings) that aren’t visible until excavation
• Shell sections that are larger and heavier than expected once cut, creating loading challenges

Side-by-Side Comparison

Why Concrete Pool Removal Usually Costs More

The price difference between concrete and fibreglass pool removal reflects:

• More machinery wear: The hydraulic breaker is high-wear tooling that adds significant cost to operations
• More material to move: 20-35 tonnes of concrete rubble versus 2-3 tonnes of fibreglass shell, dramatically more truck movements
• More labour time: Breaking and sorting concrete is slower than cutting and lifting fibreglass
• Rebar separation: Adding time and labour to the concrete breaking process

See the pool removal cost by pool type guide for detailed cost breakdowns.

Which Is Harder in the Southern Highlands Context?

Both pool types have site-specific challenges in the Southern Highlands, but they manifest differently:

Concrete pools in the Southern Highlands often have:

• Very hard, dense concrete from the gunite method used in the 1980s, 1990s
• Thick pebblecrete surfaces that add mass and silica dust risk
• Basalt clay that grips the outer shell and resists excavation

Fibreglass pools in the Southern Highlands often have:

• Expansive clay soils that can grip the shell so tightly that intact lift isn’t possible
• High groundwater in winter creating float risk during draining
• Older shells (1990s vintage) that are more brittle and prone to cracking during cutting

Both types can be removed successfully with experienced contractors, the point is that the contractor’s experience with your specific pool type matters. Ask how many concrete (or fibreglass) removals they’ve done in the Southern Highlands before engaging them.

Frequently Asked Questions

Is it faster to remove a fibreglass pool than a concrete pool? Generally yes, fibreglass removal typically takes one to two days less on site than equivalent concrete removal. But this doesn’t always mean it’s a quicker project overall; the approval process and scheduling timelines are the same.

Can a contractor who specialises in concrete also remove fibreglass, and vice versa? Experienced pool removal contractors work with both types. Some operators are more specialised, those who primarily do rural earthworks may be less experienced with fibreglass cutting, for example. Ask specifically about their experience with your pool type.

Does breaking concrete create a lot of dust? Yes. Hydraulic breaking of concrete generates concrete dust, and pebblecrete surfaces contain silica particles. Water suppression should be used during breaking to reduce dust. Neighbours should be informed if they’re close to the work area.

Why can’t a fibreglass pool be crushed like concrete? Fibreglass cannot be crushed the same way, it compresses and springs back rather than fracturing. An excavator bucket can crumple sections, but the material doesn’t break down into aggregate the way concrete does. Fibreglass must be cut into removable sections.

If I have a pool-spa combination, are both components demolished the same way? If the spa is concrete, it’s demolished the same way as the pool. If the spa is a separate fibreglass unit connected to a concrete pool, the fibreglass spa is cut and removed while the concrete pool is broken. Most combination removals are done as a single job.

Ready to get a quote for your specific pool type? Contact Southern Highlands Pool Removals for a free on-site assessment and quote.