Question

In plastering, the 1^st coat is called ___________ and its thickness should be _______ mm.

(a) Undercoat, 6-9

(b) Floating coat, 6-9

(c) Floating coat, 10-15

(d) Undercoat, 10-15

This question was posed to me in an interview for job.

The origin of the question is Plastering topic in section Building Construction of Basic Civil Engineering

Answer 1

Correct answer is (d) Undercoat, 10-15

Easy explanation: Plastering can either be done in single, 2 or 3 coats. The 1^st coat is undercoat of thickness of 10-15mm. 2^nd coat is floating coat of 6-9mm thickness. The last coat is the finishing coat of 2-3mm thickness.