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Lay: It is the minimum length of the region in the member where there is no twisting or torsion. As per AS 1720.1 – 2010, Lay is defined as the distance between points of effectively rigid restraint between which bending about the minor axis would be produced by buckling under load.
A roof is a top covering of the building to provide protection against the snow, sunlight, rain, extreme temperatures, as well as winds. In other words, a roof system is a set of connected elements to provide a stable support system to the roof and coverings.
Based on architectural and client requirements, roof systems are classified based on roof exposure, roof structural system and roof slope.