Question

Rat-trap bond masonry requires _________ less mortar.

(a) 10%

(b) 50%

(c) 40%

(d) 20%

This question was posed to me during an interview.

Question is from Cost Effective Construction Techniques in chapter Building Construction of Basic Civil Engineering

Answer 1

The correct answer is (c) 40%

For explanation I would say: Rat-trap bond masonry is a technique where bricks are laid on their edges. Hence approximately 25% less bricks and 40% less mortar is used compared to conventional one.