Question

Timber trusses are not preferred when the span is greater than __________

(a) 3 m

(b) 5 m

(c) 7 m

(d) 10 m

This question was posed to me during an interview.

The origin of the question is Trussed Roofs topic in chapter Roofing Materials of Construction & Building Materials

Answer 1

Correct option is (d) 10 m

The best I can explain: Timber trusses are not preferred when the span is greater than 10 m. In this case, timber trusses become uneconomical whereas steel trusses are more economical. Hence, steel trusses are used in place of timber trusses.