RICS Surveying Practice Test & Exam Prep

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You are assessing a property situated on shrinkable London Clay. There is a large oak tree located 10 metres from the rear elevation. The rear wall shows diagonal stepped cracking (5mm wide) that is wider at the top than the bottom. What is the most probable cause of this movement?

Ground heave due to the removal of vegetation Thermal contraction of the rear extension Subsidence caused by clay shrinkage due to moisture abstraction by the tree Sulphate attack in the concrete strip foundations

Correct Answer:

Subsidence caused by clay shrinkage due to moisture abstraction by the tree

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