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are found in areas settled by the
English and may have been a new invention in the Massachusetts Bay Colony. No examples of framed buildings with common purlin roofs have been reported in England, however some stone barns in England have vertically boarded, common purlin roofs. Historically, these roofs are found in New England, the highest concentration in Maine, and isolated parts of New York and along the St. Lawrence River in Canada. One of the oldest surviving examples is in the
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classified by how they connect to the principal rafters: "through purlins" pass over the top; "butt purlins" tenon into the sides of the principal rafters; and "clasped purlins," of which only one historic U.S. example is known,) are captured by a collar beam. Through purlins are further categorized as "trenched," "back," or "clasped;" butt purlins are classified as "threaded," "tenoned," and/or "staggered."
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Steel industry practice assigns structural shapes representative designations for convenient shorthand description on drawings and documentation: Channel sections, with or without flange stiffeners, are usually referenced as C shapes; Channel sections without flange stiffeners are also referenced as
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Common purlins in wood construction, also called a "major-rafter minor-purlin system". Common purlins are typically "trenched through" the top sides (backs) of principal rafters and carry vertical roof sheathing (the key to identifying this type of roof system). Common purlin roofs in North
America
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Principal purlins in wood construction, also called "major purlins" and "side purlins," are supported by principal rafters and support common rafters in what is known as a "double roof" (a roof framed with a layer of principal rafters and a layer of common rafters). Principal purlins are further
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Cold formed members can be efficient on a weight basis relative to mill rolled sections for secondary member applications. Additionally, Z sections can be nested for transportation bundling and, on the building, lapped at the supports to develop a structurally efficient continuous beam across
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and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone could span, thus allowing a wider building. Purlin plates are very commonly found in large old barns in North
America. A
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The origin of the common purlin roof is my studied opinion. These roofs were historically common in northern Europe and may have been brought to the New World by the
Pilgrims after their two decades of living in the
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U shapes; Point symmetric sections that are shaped similar to the letter Z are referenced as Z shapes. Section designations can be regional and even specific to a manufacturer. In
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are the large beams perpendicular to the rafters; from this shot, it appears that there are three purlins on either side of the roof. The sheathing boards are sometimes called the
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or walls. Purlins are most commonly used in Steel Framed
Building Systems, where Z-shapes are utilized in a manner that allows flexural continuity between spans.
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Information on the origin of the term "purlin" is scant. The Oxford
Dictionary suggests a French origin, with the earliest quote using a variation of
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A view of a roof using common purlin framing. The purlins are marked in red. This view is from the inside of the building, below the roof. The
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Roll-formed metal roof purlins, also called roof battens. They are cropped to the angle of the purlin top cuts and can be lapped for joining.
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A purlin plate in wood construction is also called an "arcade plate" in
European English, "under purlin", and "principal purlin". The term
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Harris, Richard. "Bays, frames and boxes." Discovering timber-framed buildings. 3rd revised ed. Aylesbury: Shire
Publications, 1979. 10
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168:, that is a roof of nothing but vertically laid boards with seams covered with battens or another layer of boards.
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typically refers to roof framing members that span parallel to the building eave, and support the roof decking or
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means a major, horizontal, supporting timber. Purlin plates are beams which support the mid-span of
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Note: The sketches in this section reference terminology commonly used in the UK and
Australia.
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in
Newbury, Massachusetts, from 1678. The purpose of a common purlin roof may be they allow a
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A section through lightweight timber-frame construction showing the position of under purlins
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are the beams of wood angled upward from the ground. They meet at the top of the gable at a
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construction. Steel purlins may be painted or greased for protection from the environment.
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there are three basic types of purlin: purlin plate, principal purlin, and common purlin.
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Big house, little house, back house, barn: the connected farm buildings of New England
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494:. Vol. 22 (11th ed.). Cambridge University Press. p. 665.
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Portal rafters made from C section material supporting Z roof purlins
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Metal purlins or roof battens screwed to roof gang-nail-type trusses
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This article incorporates text from a publication now in the
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and main roof. House under construction, tropical North Australia.
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397:. York, England: Council for British Archaeology, 1996. G14, F12.
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The ability of Z purlins to rotate 180 degrees and fit together
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in 1447, though the accuracy of this claim has been disputed.
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Glossary of Australian Building Terms - Third Edition.(NCRB)
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Recording timber-framed buildings: an illustrated glossary
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85:) is a longitudinal, horizontal, structural member in a
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An Illustrated glossary of roofs and roofing terms.
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276:C and Z purlins in all-steel construction
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431:"What are Purlins - Metsec"
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393:Alcock, N. W. "Purlins."
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61:and are painted white.
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439:. Retrieved
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712:Collar beam
667:Tented roof
652:Saddle roof
647:Ridged roof
607:Gablet roof
567:Bochka roof
557:Barrel roof
552:Arched roof
544:Roof shapes
136:crown plate
98:steel frame
862:Categories
847:Wind brace
812:Roof truss
807:Roof tiles
797:Roof ridge
777:Ridge vent
737:Green roof
627:Onion dome
602:Gable roof
582:Clerestory
562:Board roof
372:References
314:queen post
166:board roof
47:ridge beam
662:Shed roof
597:Flat roof
104:Etymology
59:roof deck
822:Skylight
792:Roofline
727:Flashing
702:Catslide
622:Hip roof
572:Bow roof
345:See also
182:sheeting
75:purloyne
707:Chimney
479::
441:3 April
208:Gallery
186:rafters
131:rafters
83:perling
79:purling
71:purline
55:purlins
51:bracing
43:rafters
18:Purlins
827:Soffit
772:Rafter
767:Purlin
742:Gutter
717:Dormer
486:Purlin
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178:purlin
110:purlin
67:purlin
868:Roofs
837:Spire
752:Joist
732:Gable
722:Eaves
697:Attic
536:Roofs
356:Joist
127:plate
762:Loft
592:Dome
443:2024
351:Girt
87:roof
488:".
320:or
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433:.
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20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
