what are purlins?

roof construction

Answers:
Horizontal beams (metal or wood) that support the rafters of the roof

Other answers:
they kep the rafters of the roof uniform and in a straight line, normally 9" X 3" they brace the rafters to stop them spreading or sagging,and very important to kepp the structure of the roof together
they kep the rafters of the roof uniform and in a straight line, normally 9" X 3" they brace the rafters to stop them spreading or sagging,and very important to kepp the structure of the roof together
A horizontal brace between opposing rafters that keeps the ridge from sagging and bowing out the walls. To visualize, it is the cross member in the capital letter "A".
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