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In order to reduce the size of rafters, the intermediate support, called the ___________ are introduced under the rafters.(a) Couple roofs(b) Purlins(c) Tie beam(d) Collar beamI have been asked this question at a job interview.I would like to ask this question from Types of Pitched Roofs in chapter Roofing Materials of Construction & Building Materials

Answer»

The correct option is (b) Purlins

Explanation: When the SPAN exceeds about 2.4 meters, the necessary size for the rafters become ECONOMICAL. Hence double or Purlin roofs are provided in such CASES.



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