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Princes Hill blocks are often tight, close to established homes and services, so mistakes in set-out, drainage falls or moisture barriers can be hard to fix after the concrete is poured. A pre-slab check helps prevent hidden defects being locked under the slab.
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Our comprehensive service includes everything you need to make an informed decision about your property.
We compare the formwork layout to the plans where available, checking slab dimensions, edge beam locations and setbacks as visible on site. In tightly spaced Princes Hill builds, a small set-out error can create boundary issues, misaligned walls and costly rework once framing starts.
We assess the prepared sub-base for evenness, cleanliness and obvious soft spots, fill zones or disturbed areas that may need attention. The goal is to reduce the risk of differential settlement that can show up later as slab movement or cracking.
We look for formwork stability, bracing, gaps and signs of movement, and check that the formwork appears consistent with intended levels and thickness. Poor formwork can lead to uneven slab thickness and edge defects that affect the rest of the build.
We inspect the placement of mesh and bars, including laps, spacing, bar locations in beams and whether reinforcement is properly supported on chairs to achieve cover. Incorrect positioning can reduce slab performance and durability once the slab is loaded.
We check the membrane for tears, punctures, adequate lapping and taping, and that it is correctly turned up where required. In inner-north areas like Princes Hill, good moisture control helps reduce ongoing dampness issues that are difficult to diagnose after flooring is installed.
We review plumbing/electrical penetrations through the slab area, trenching and any visible edge details to ensure they’re placed and protected appropriately before the pour. Misplaced or poorly sealed penetrations can cause later leaks, movement around pipes, or compromised moisture barriers.
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Find answers to the most frequently asked questions about our inspection service.
Book it once the formwork, reinforcement and membrane are installed, and service penetrations are in place, but before the concrete pour is confirmed. In Princes Hill, sites can be busy and access tight, so organise the inspection as soon as your builder advises the pour window. This timing lets you request changes without delaying the build unnecessarily.
Yes. Extensions often involve tying new work into existing structures and working around older drainage runs, footings or retained garden areas. A Stage 1 inspection focuses on the new base stage items—set-out, preparation, reinforcement and moisture barrier—so you can confirm the new slab is prepared correctly before it is connected to the rest of the house.
Items that end up buried are the hardest to fix: incorrect reinforcement placement, poor vapour barrier laps or punctures, wrong slab levels, and set-out issues that affect wall positions. After the pour, rectification can involve cutting concrete, redoing plumbing penetrations, or living with ongoing moisture and drainage issues. Stage 1 is the best point to catch these early.
In most cases, yes. We inspect what is safely and reasonably accessible on the day, including slab edges, reinforcement placement, membrane continuity and visible base prep. For tight side access or adjoining boundaries, we document any limitations and focus on high-risk areas that are still viewable. If something can’t be verified, we note it clearly in the report.
Yes. ACE Building and Pest Inspections provides a detailed report with photos, clear descriptions of each concern, and practical recommendations you can pass directly to your builder or site supervisor. We prioritise items that must be addressed before concrete, such as membrane defects, reinforcement support/positioning, and formwork issues that could affect slab thickness or alignment.
Still have questions?
Get in TouchACE Building and Pest Inspections focuses on base-stage details that get buried fast—formwork, steel and moisture control—so you can act early. Call 0485 857 077 to schedule your Stage 1 – Pre-Slab (Base Stage) Inspection in Princes Hill.