When the span exceeds 4.8 M and when there is no inside supporting walls for Purlins, the frame structures adopted, known as the _____________(a) Single roofs(b) Purlin roofs(c) Double roofs(d) Trussed roofsI had been asked this question in an online quiz.The question is from Types of Pitched Roofs in chapter Roofing Materials of Construction & Building Materials

When the span exceeds 4.8 M and when there is no inside supporting wal

1.	When the span exceeds 4.8 M and when there is no inside supporting walls for Purlins, the frame structures adopted, known as the _____________(a) Single roofs(b) Purlin roofs(c) Double roofs(d) Trussed roofsI had been asked this question in an online quiz.The question is from Types of Pitched Roofs in chapter Roofing Materials of Construction & Building Materials
Answer» CORRECT choice is (d) Trussed roofs The explanation is: The spacing of Trusses depend upon the load on the roof, position of cross walls, SPAN and materials on the trust. But the spacing is generally 3M for wooden Trusses. The Trusses CARRY the ridge pieces and PURLINS on which the COMMON rafters rest.

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