RICS Surveying Practice Test & Exam Prep

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During the inspection of a 1930s semi-detached house, you observe horizontal cracking along the mortar joints of the front elevation at roughly 900mm intervals. The brickwork appears slightly bowed outwards. What is the most likely cause of this defect?

Sulphate attack within the mortar joints Corrosion and expansion of mild steel cavity wall ties Thermal expansion of the external brick skin Subsidence of the front bay window foundation

Correct Answer:

Corrosion and expansion of mild steel cavity wall ties

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