Question

The effective thickness should be _________ of the sum of actual thicknesses of the two skins of a cavity wall if both the skins have uniform thickness throughout.

(a) One-fourth

(b) Half

(c) Two-thirds

(d) One-third

The question was posed to me in unit test.

My doubt is from Effective Length and Thickness of Wall topic in chapter Load Bearing Walls of Construction & Building Materials

Answer 1

The correct answer is (c) Two-thirds

Explanation: The effective thickness should be two-thirds of the sum of the actual thicknesses of the two skins of a cavity wall. This is applicable only if both the skins or leaves of the cavity wall are of uniform thickness throughout.