– 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 a purlin on rafters

installing purlins across rafters

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About Tony Wood

Tony is a life time resident of North Carolina with over 30 years experience in multiple facets of the industrial, commercial and residential construction industry. For the past 23 years he has owned and operated Wood's Home Maintenance Service, providing services primarily in Johnston, Wake and Sampson Counties of North Carolina. ______________ ______________________________________________________ The information contained in this Blog is opinion derived, from hands on experience of over 30 years in the construction industry and by extensive research by the author. All postulations are referenced to the geographic location in which this experience was gained.
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