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Kew builds often involve sloping blocks, tight side access and large established trees—conditions that can affect cut-and-fill, drainage and slab prep. A pre-slab inspection checks the base stage before concrete locks issues in.
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We assess whether the slab base appears properly prepared for the stage, including visible compaction outcomes, grading and bearing areas. This matters in Kew where split-level designs and cut-and-fill can create uneven support if the base isn’t correctly formed before concrete.
We check the set-out of formwork, slab edges, step-downs and rebates where accessible, comparing to the drawings provided. Incorrect edge thickening or mislocated step-downs can affect structural performance and create costly rework for wet areas and garage levels.
We inspect reinforcement type and placement that’s visible at the time, including bar positioning, overlaps, mesh support and cover considerations. Poorly supported steel can end up sitting too low or shifting during the pour, reducing the slab’s intended performance.
We check the moisture barrier for tears, punctures, correct laps and taping where applicable, plus how it’s carried up at edges and penetrations. A compromised membrane can allow ground moisture to migrate into the slab, impacting floor finishes and indoor comfort.
We review plumbing and other penetrations for position, sleeving and sealing approach at the stage, along with set-downs for showers or other wet areas if present. Misplaced penetrations can lead to structural drilling later or poor sealing around pipes.
We look for visible provisions that help manage water around the building footprint, such as subfloor drainage setup where applicable and how the site levels aim to direct water away. On tighter Kew sites, small grading errors can concentrate water against the slab edge.
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Find answers to the most frequently asked questions about our inspection service.
Book it for the window after formwork, steel reinforcement, plumbing rough-ins and the vapour barrier are installed, and before the concrete pour is confirmed. In Kew, pours can be scheduled tightly due to access and traffic conditions on narrower streets, so aim to organise the inspection as soon as you’re told “steel is down” to avoid missing the opportunity.
Yes—if you provide the relevant plans, we use them to guide what we verify on site for this stage, such as slab edge details, step-downs and reinforcement layout that is visible. We’ll note any observed discrepancies or items needing clarification with the builder or engineer. Some elements may be concealed or incomplete at the time, and we document those limitations clearly.
Common pre-pour issues include torn or poorly lapped vapour barriers, reinforcement not properly supported, missing bar overlaps, incorrect edge forms, poorly placed set-downs, and penetrations that are too close to slab edges. We also look for base preparation and drainage details that may lead to ponding or moisture pathways. Identifying these early allows corrections without demolition.
Kew’s established gardens and large street trees can influence site moisture and how water moves across the block, especially after excavation changes the natural fall. At Stage 1 we pay close attention to how the base is prepared near boundaries, the integrity of the moisture barrier, and whether visible drainage provisions support water being directed away from the slab footprint. It’s about reducing avoidable moisture and movement drivers from day one.
You’ll receive a detailed report with photos, written observations and practical recommendations relevant to the pre-slab stage. We describe what we saw, why it matters and what to raise with the site supervisor before the pour proceeds. Many clients use the report as a checklist for rectification sign-off, keeping communication factual and focused on specific items rather than general concerns.
Still have questions?
Get in TouchACE Building and Pest Inspections checks formwork, steel and moisture barriers at the exact point you can still fix issues—call 0485 857 077 to schedule your Stage 1 Pre-Slab (Base Stage) Inspection in Kew.