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Nunawading blocks often mix reactive clay areas with cut-and-fill sites near drainage lines—getting the base, steel and vapour barrier right before the pour helps prevent slab movement and moisture problems later.
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Our comprehensive service includes everything you need to make an informed decision about your property.
We check the base is properly prepared and compacted where visible, including level tolerances, removal of loose material, and readiness for the slab build-up. Poor preparation can lead to uneven support under the slab, increasing the risk of cracking and differential movement.
We assess formwork alignment, bracing and key dimensions that can be verified pre-pour, including edge beam locations and slab thickness allowances. Errors here can affect boundary clearances, floor levels, garage falls and the way frames sit on the slab.
We inspect reinforcement type and placement where accessible, including mesh/beam steel position, bar laps, tie wire fixing and coverage intent. Misplaced steel or inadequate laps can reduce structural performance and lead to cracking patterns that are hard to manage after the build progresses.
We check that reinforcement is supported at appropriate heights using suitable chairs/spacers so the steel doesn’t end up on the ground or sitting too high. Correct cover is essential to durability, helping prevent corrosion and loss of strength over time.
We verify the vapour barrier is installed with correct lapping, taping and coverage, including around slab penetrations where gaps commonly occur. A compromised membrane can allow ground moisture to migrate into the slab, affecting flooring, adhesives and internal humidity.
We inspect plumbing/electrical penetrations, slab rebates and edge beam areas for correct placement and sealing readiness. Poorly located or unprotected penetrations can create weak points, make fit-off difficult, and increase the chance of moisture and pest entry pathways later.
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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 for the window after the formwork, reinforcement and vapour barrier are installed, but before any concrete is poured. In Nunawading, pours can be scheduled quickly once steel is down, so aim to secure an inspection as soon as you get the builder’s pre-pour notice. If the membrane isn’t down yet, it’s usually too early; if concrete is booked for the next morning, it may be too late to fix issues properly.
We don’t perform geotechnical testing on site, but we do review what’s available on the day (such as drawings and footing/slab documentation) and assess whether the visible set-out, formwork, reinforcement and membrane appear consistent with the approved design. If something on site doesn’t match what’s documented, we’ll highlight it clearly so you can seek confirmation from the builder or engineer before the pour proceeds.
Common issues include reinforcement not being adequately supported (steel sitting low or chairs missing), laps that look short or inconsistent, membrane laps not taped or torn around penetrations, and formwork that isn’t straight or well-braced. We also see penetrations placed too close to edges or not sealed in a way that supports the vapour barrier. These are all far easier to rectify before concrete is placed.
KDRB sites in Nunawading often have legacy services, old drains, and filled areas where the previous house and driveway were removed. That makes service trenching, backfill quality and penetration locations particularly important to check pre-pour. We pay close attention to slab edges near former structures, membrane continuity around new penetrations, and whether the base looks properly prepared where it’s visible, so you can address risks before they’re locked in.
Yes—tight side access and close boundaries are common in Nunawading, especially with modern designs on older lots. We’ll inspect what’s safely accessible and document any areas we can’t reasonably view. If access limitations prevent confirmation of key items, we’ll note that in the report and suggest practical next steps, such as requesting the builder provide additional photos before the pour or allowing temporary access.
Still have questions?
Get in TouchACE Building and Pest Inspections checks the steel, formwork and vapour barrier while they’re still visible, then provides a photo-backed report you can use to get defects fixed early. Call 0485 857 077 to schedule.