Schofields Building
Inspections

Ground conditions and drainage in Schofields NSW

Schofields sits on the Cumberland Plain, where soils weather from Wianamatta Group shale into clay rich profiles that swell and shrink with moisture. The practical consequence for an owner is not the geology, it is the drainage. On one Schofields property we found a downpipe that had never been connected to the stormwater system, which means every rain event for years had been discharging roof water at the base of a wall, into exactly the clay that responds worst to it. We publish no site class for the suburb, because that belongs to your lot's soil report.

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The suburb lies on the Cumberland Plain over Wianamatta Group shale.

Weathering leaves a clay rich soil here that expands and contracts with the seasons.

A downpipe not connected to stormwater discharges at the base of a wall.

Site grading was recorded as outstanding three times on our frame inspections here.

AS 2870 site class comes from your lot's soil report, never a suburb average.

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Written by our local inspection team from work carried out in Schofields. Licensed building practitioners.

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FAQ

Ground conditions and drainage in Schofields NSW: common questions

What site class applies?

A single number across a whole suburb would not be honest. Your own lot's soil report holds the answer.

How much does drainage really matter on clay?

A great deal. Reactive clay responds to moisture, so water concentrated at one point of the footing produces movement at that point and not elsewhere. Differential movement is what cracks walls.

What can I actually control?

Where roof water goes and how the ground falls. Both are cheap to correct and both are frequently left undone.

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