Cobbitty Building
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Measuring a floor that has started to move

How we record floor movement so an engineer and a builder can act on it.

Cobbitty 2570 · 17 June 2026

In short: An investigation in Ambarvale recorded evident movement in the living and dining floors and measured it.

The call

An owner in Ambarvale noticed the living and dining floors no longer felt level. The investigation found movement in the flooring was evident.

What was measured

Levels were taken across the affected area with a digital level and straight edge, and photographed in place.

Why measurement beats description

A number can be compared with the tolerance in the Guide to Standards and Tolerances 2017. A description cannot.

Likely causes

Reactive clay drying or wetting unevenly, poor drainage near the footings and undersized framing are common causes in the region. The report states which the evidence supports.

The next step

Where movement is significant, a structural engineer should assess it. The report gives them a measured starting point.

Written by our local inspection team from work carried out in Cobbitty. Licensed building practitioners, NSW Fair Trading licence 366177C.

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FAQ

Questions Cobbitty owners ask about this

Is movement always structural?

No. Some is seasonal and within tolerance. The measurements tell us which.

Should I monitor it?

Yes, repeated readings over months show whether it is still moving.

Can you recommend an engineer?

We can explain what the engineer needs to look at and what our report covers.

Does this apply to timber floors?

Yes. Timber joist systems can deflect or sag, which looks similar but has different fixes.

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