Leppington Building
Inspections

Flashings installed to collect water

A flashing works by geometry, and geometry can be got wrong.

Owner Inspections · Leppington 2179 · 2026-03-27

In short: Poor flashing installation in four locations on Leppington handovers.

The principle

A flashing is shaped and lapped so water runs off it and away from the junction it protects.

What we recorded

Poor installation across four separate locations on Leppington homes at practical completion, along with a gutter sump undersized for its roof.

The slow failure

Water sits at a lap, finds the fastener, then the substrate behind. Nothing happens quickly, which is how it survives handover.

The sump

A sump too small for the roof feeding it backs the gutter up in a storm, and a backed up gutter puts water somewhere other than the downpipe.

How we see it

From the ground where possible, and from a drone where not. Neither finding is visible from inside the house.

Written by the Owner Inspections team from inspections carried out in Leppington. Licensed building practitioners, NSW Fair Trading licence 366177C.

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FAQ

Questions Leppington owners ask about this

Is this a design or installation fault?

It can be either, and the report says which the evidence supports, because that decides who carries it.

How urgent is it?

It is a handover item worth pressing, because the failure mode is water into the building and the fix is cheap before you pay.

Would I ever pick it up on my own?

Realistically only during a heavy storm, by which point you are dealing with the consequence.

Do you use a drone?

When it adds something and conditions permit. On roof level detail it is close to essential.

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