RICS Surveying Practice Test & Exam Prep

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A solid brick wall of a Georgian house is finished externally with a modern cement-based render. You observe extensive cracking and hollow-sounding areas when tapped. Why is a cement-based render unsuitable for this substrate?

Cement render is too vapor-permeable and allows excessive moisture ingress It is too rigid and impermeable, trapping moisture and causing freeze-thaw damage It reacts chemically with the historic lime mortar, causing sulphate attack It increases the thermal transmittance of the wall, leading to condensation

Correct Answer:

It is too rigid and impermeable, trapping moisture and causing freeze-thaw damage

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