Question

___________________ is a fire resistant material and it does not allow heat to pass easily.

(a) Gypsum plaster

(b) Snowcrete

(c) Sirapite

(d) Scagliola

This question was posed to me by my college professor while I was bunking the class.

This interesting question is from Special Materials for Plastered Surfaces topic in section Pointing and Plastering of Construction & Building Materials

Answer 1

Correct option is (a) Gypsum plaster

To explain: Hence, Gypsum plaster is used as an insulating material to protect wood or metal columns and beams from high temperatures. It is light in weight.  To decrease the weight, the fillers such as saw dust, wood shaving, etc. may be added to it.