Masonry Construction MCQ with answer and solution

Concept

Rainwater protection using parapet wall copings

Formula

Coping provides water shed with overhang and drip throat

Step-by-step solution

1. Parapet and boundary walls have exposed top surfaces directly vulnerable to rain. 2. Ingress of rainwater into vertical mortar joints causes efflorescence, frost damage, and structural degradation. 3. Copings are designed with weathered sloping tops and drip throats to deflect rainwater away from wall faces. 4. Thus, the primary function of coping is rainwater protection. Answer: C

Explanation

A coping is a protective cap or covering course placed over the top of exposed masonry walls, such as boundary or parapet walls. Its primary function is to shed rainwater and prevent water seepage into the masonry joints below.

Why the other options are wrong

A) Copings do not carry or transfer structural floor or roof loads. B) Copings provide no significant thermal insulation to building interiors. D) Increasing height is accomplished by continuing masonry courses, not capping.

Shortcut

Coping = Parapet cap for rainwater protection and weatherproofing.

Common mistake

Thinking coping is provided for vertical structural load transfer.