Which property is characteristic of lime-based pointing regarding moisture management?

• A. It is completely waterproof.
• B. It has reduced vapor permeability.
• C. It maintains vapor permeability and elasticity.
• D. It prevents any movement.

Answer: (C)

Lime-based pointing keeps moisture under control by being both breathable and flexible. It allows water vapor to pass through the joint, so damp from inside the wall can dry out rather than being trapped. At the same time, it remains elastic enough to accommodate small movements in the masonry without cracking. This combination of vapor permeability and elasticity is what makes lime pointing effective for moisture management. In contrast, a completely waterproof joint would trap moisture, a reduced vapor permeability would hinder drying, and a joint that prevents any movement would be prone to cracking as the wall shifts.