– a horizontal member that runs perpendicular to the rafters in a framed roof. Parallel rows of purlins may rest atop the rafters and support the roof-deck which is nailed or screwed into the purlins. Purlins may also be attached to the tops of exposed rafters such as are found on a pergola. When used in this manner, they stabilize the rafters to prevent twisting or warping, afford additional shade and enhance the aesthetics of the structure. A purlin plate may run under and support the central expanse of rafters, allowing longer spans than unsupported rafters could attain, thus facilitating the construction of wider buildings.
installing purlins across rafters
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