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Subsidence Chafford Hundred

Buying a property and survery come back with moderate - high subsidence. Awaiting further info, builders report but estate agents saying we may never get this report as taking 6 weeks or more. Its only 15yr old house so why is this building report not available anymore. Should we proceed with a property with mod-high subsidence and im wondering if other houes in chafford hundred have come back with the subsidence issue? estate agent pushing us now.

Asked on Aug 26 2014, General in Grays | Report content

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  • Walk away now.

    Answered on Aug 26 2014, Report content
  • This house will always have a stigma attached, you may have difficulty selling it in the future unless you are buying at a very substantial discount to similar stable properties leave well alone.

    Answered on Sep 7 2014, Report content
  • As I know Chafford Hundred like the back of my hand, I am surprised with this report. Chafford Hundred is built in the former chalk quarries of Thurrock and as any geologist will tell you, chalk is a stable rock. The principle risk from chalk is when it is overlaid with a substantial layer of clay. Clay retains water and becomes virtually impervious once saturated, giving rise to the risk of surface water flooding. When the clay is saturated, and lying above porous chalk, the chalk will allow excess water in the clay to pass through into it. The problem comes from the water itself which picks up acid in the clay and this rapidly erodes the chalk. What then happens is that the chalk softens and collapses from under the clay. The clay will bridge the void for a long time as it is quite able to support ground above it until it either dries excessively and fractures or it rapidly saturates again and becomes fluid. That is when the clay will collapse into a 'swallow hole'. Since Chafford Hundred is not built on clay over chalk, this risk is minimal. There is also ballast in Chafford Hundred. This is also a very stable form if contained, but there is a risk of subsidence at the transitional points where the ballast lies adjacent to non-compacted soils such as sand or dried out clay.

    Web reference:

    Answered on Dec 14 2014, Report content

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