Ground conditions and slabs in Box Hill NSW
Box Hill sits on the Cumberland Plain over the Wianamatta Group, and the upper unit through this part of Sydney is Bringelly Shale. Weathering produces clay rich soils with a pronounced contrast between a lighter surface layer and a dense clay subsoil, classed as Kurosols and Sodosols. Those clays are documented as reactive with an appreciable shrink and swell range, and Bringelly Shale in particular carries mixed layer clay minerals that make it more prone to swelling than the Ashfield Shale beneath it. Drainage across the plain is poor, which compounds the movement. What we will not print is a site class for the suburb, because AS 2870 classification is determined for your lot from your own soil report.
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The suburb sits over the Wianamatta Group, upper unit Bringelly Shale.
Weathered shale gives clay rich soils classed as Kurosols and Sodosols.
Those clays are documented as reactive with appreciable shrink and swell.
Bringelly Shale is around 51.5 per cent clay minerals and weathers faster than Ashfield Shale.
Poor drainage across the Cumberland Plain compounds seasonal movement.
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Written by our local inspection team from work carried out in Box Hill. Licensed building practitioners.
