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Wantirna blocks can vary from flatter estate lots to sloped sites closer to the Dandenong Creek corridor—small drainage or set-out mistakes at base stage can lock in slab movement and damp issues for years.
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Our comprehensive service includes everything you need to make an informed decision about your property.
We check that the site is cleaned up, the sub-base is properly prepared, and the base material is consistent and suitable to support the slab. Poor preparation can lead to slab settlement, cracking, and uneven floors that are expensive to rectify once the home is framed.
We inspect boxing alignment, slab edge dimensions, step-downs, and rebates to ensure the slab is formed as per plan and practical tolerances. Errors at this stage can affect wall set-out, brickwork alignment, garage falls, and future waterproofing transitions.
We review steel mesh and bar placement, overlap lengths, and whether reinforcement is positioned where it’s intended to work. Missing laps, incorrect orientation, or poor tie-down can reduce slab performance and increase the risk of cracking under normal movement.
We confirm the steel is supported on the right chairs/spacers and sits at the correct height so it ends up within the concrete with adequate cover. Steel that’s too low or sitting on the membrane won’t perform as designed and can contribute to long-term durability issues.
We inspect the vapour barrier for holes, tears, correct lapping and taping, and careful sealing around penetrations. This matters in Wantirna where ground moisture management can influence internal humidity, flooring performance, and mould risk after handover.
We check pipe and conduit penetrations for location, clearance, and sealing, plus slab edge detailing where termites or moisture may become future concerns. Poorly placed penetrations can weaken edges, clash with framing, and create pathways for moisture if not treated properly.
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Get Stage 1 – Pre-Slab (Base Stage) Inspection as part of a comprehensive inspection package
Find answers to the most frequently asked questions about our inspection service.
Book it as soon as you receive notice the site is at base stage and the builder is planning the pour—ideally 24–48 hours before concrete. In Wantirna, weather changes can speed up scheduling, so earlier is better. The inspection must be completed after formwork, steel, membrane and penetrations are in place, but before any concrete is poured.
Before the pour, it’s usually straightforward to adjust boxing levels, re-position or add reinforcement, replace damaged vapour barrier sections, and correct penetrations and sleeves. After the pour, these become permanent, and fixes may involve grinding, cutting, epoxy repairs, or redesigning framing and drainage to suit the mistake. Stage 1 is the best time to catch problems cheaply.
Yes. We inspect what’s installed on site and compare it to the available plans and engineering details you provide, along with applicable building requirements for base-stage preparation. If something doesn’t match—such as mesh laps, bar placement, step-down dimensions, or membrane detailing—we record it with photos and explain what to raise with the builder for rectification.
Often, yes. Sloping sites can introduce cut-and-fill, retaining interfaces, and more complex drainage and step-downs, all of which affect slab performance. In Wantirna, some streets sit on gentle grades while others fall toward creek lines and reserves, so levels and moisture control can vary. A pre-slab inspection helps confirm boxing, support, and moisture detailing are executed correctly for that specific site.
It can. Knockdown rebuilds may involve existing services, previous fill, and disturbed ground from demolition, which can affect base preparation and drainage. We pay close attention to sub-base readiness, penetrations and sleeves, and whether the membrane and edge details are well sealed. We also look for signs that site clean-up has been thorough so the slab isn’t poured over debris.
Still have questions?
Get in TouchACE Building and Pest Inspections will check your base stage before the pour and deliver a photo-backed report you can act on straight away—call 0485 857 077 to secure an inspection time that suits your builder’s schedule.