Question

The insulating value of cavity walls is __________ greater than the solid walls.

(a) 10%

(b) 15%

(c) 20%

(d) 25%

I had been asked this question in a national level competition.

I'm obligated to ask this question of Cavity Walls topic in section Cavity Walls & Partition Walls of Construction & Building Materials

Answer 1

Right choice is (d) 25%

Best explanation: A huge amount of air is present inside the cavity of a cavity wall which is a poor conductor of heat. Hence cavity walls provide great thermal insulation to the buildings. The insulating value of a cavity wall is 25% greater than a solid wall.