Question

Actual thickness of wall with 2.5 brick is __________

(a) 30cm

(b) 50cm

(c) 49cm

(d) 20cm

This question was posed to me during an internship interview.

This interesting question is from Arch Masonry Calculation in section Methods of Building Estimate & Estimate of Building of Civil Engineering Drawing

Answer 1

Correct option is (c) 49cm

For explanation I would say: A two-by-four wall stud is 3^1⁄2 inches wide, and an interior wall typically has ^1⁄2-inch drywall installed on both sides, bringing the wall thickness to 4^1⁄2 inches. Walls that contain plumbing, such as walls behind sinks, however, should be thicker than standard walls. Two-by-six wall studs are 5^1⁄2 inches wide and they provide a larger stud space for running drainpipes, air ducts or other mechanical elements. With the addition of drywall on both sides, a two-by-six wall is 6^1⁄2 inches wide.