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also pur·line  (pûr′lĭn)
One of several horizontal timbers supporting the rafters of a roof.

[Middle English.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈpɜːlɪn) or


(Building) a horizontal beam that provides intermediate support for the common rafters of a roof construction
[C15: of uncertain origin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpɜr lɪn)

also pur•line


a longitudinal member in a roof frame, usu. for supporting rafters or the like between the plate and the ridge.
[1400–50; late Middle English purlyn, purloyne]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Then attach the remaining 2x4 purlins by screwing them to the spacers (Photo 1).
In these modeling studies, the shape of the fiberglass insulation drape between two consecutive purlins was assumed to be parabolic.
In the 1950s Metsec moved into construction with framing for post war pre-fabricated houses and was the first to develop lattice beams and purlins as products.
Purlins were placed 1.8m apart and directly above the shelves between cheap fluorescents, all covered with polycarbonate panels in one unfussy glowing plane.
Upstairs there are three good sized bedrooms with exposed roof purlins and a family sized bathroom with four-piece fitted suite in Victorian white.
The ridge- line and bottom eave line purlins must be cut so the ends meet snugly on the end of a truss.
Because the systems result in non-uniform insulation thicknesses (i.e., insulation thermal resistances), and because there are structural members with low thermal resistance (e.g., purlins and bracing) and different types of insulation (e.g., fiberglass batts plus extruded polystyrene spacer blocks), it is challenging to determine the overall insulation effectiveness in typical metal building roofs and walls.
the metal roofing Cut the 2x4 purlins to length and nail them to each rafter with two 16d nails (Photo 11).
Metsec's steel products formed the lattice joists, zed purlins and eaves beams that support the roof covering.
This primary structure carries purlins and rafters in the normal way, with the rafters strutted at the same angle as the struts on the tied portals, creating in effect an inverted ridge that acts as a continuous lantern because, above it, the real ridge is defined by a motorized greenhouse glazing system that can be thrown open on hot days to encourage cooling convection currents.
Upstairs the sitting room, with oak purlins and exposed ceiling beams, has windows facing south and east overlooking the Menai Strait and towards Snowdonia's mountains.
spacing for the purlins. You don't need to mark out all the rafters, just both end rafters and the center one.