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(building construction)
A horizontal roof beam, perpendicular to the trusses or rafters; supports the roofing material or the common rafters.



a horizontal structural member in a roof. A purlin is supported on the principals (girders or trusses), and it supports panels or planking. Purlins are made of metal (solid or latticed), reinforced concrete, or wood (solid or with a closed or open cross section).

purlin, purline

A piece of timber laid horizontally on the principal rafters of a roof to support the common rafters on which the roof covering is laid. Compare with subpurlin; also See common purlin, principal purlin, ridge purlin, and through purlin.
References in periodicals archive ?
In total, Metsec provided more than 1,000 tonnes of steel to the project, the largest project for the Purlins division to-date.
insul-sys] that combined the thermal resistances (the R-values) of the insulation drape on both sides of the structural element (referred to as purlin for the roof assemblies and girt for the wall assemblies) with the thermal resistance of the insulation on the structural element itself.
Cut the purlins to length and make a mark on each one, 21-1/2 in.
Purlins are placed on the beams so that each of them would have the same load.
Key equipment includes a fully automatic Z & C purlin roll forming line and fully automatic slitting line capable of slitting thinner gauge prepainted aluminum and gi coils used in making cladding.
Part Material Ground frame sides Rot-resistant lumber Ground frame ends Rot-resistant lumber Long hoop pipes Schedule 40 PVC Short hoop pipes Schedule 40 PVC Ground pipes Schedule 40 PVC Ground pipe bolts Corrosion-resistant metal Short purlins Schedule 40 PVC Long purlins Schedule 40 PVC Hip boards Softwood lumber Top plastic Greenhouse grade End wall framing Construction-grade lumber End wall plastic Greenhouse grade Part Size Quantity Ground frame sides 2 x 6 x 12 feet 6 Ground frame ends 2 x 6 x 12 feet 2 Long hoop pipes 11/2 inch dia.
The company also has manufacturing facilities for designing and manufacturing PEB components, galvanized iron (GI) roofing sheets, purlins, and cable trays in Maharashtra.
The purlins in particular were spanning longer than was good for them, even when they carried the thin slates, so with the heavy concrete tiles their sag became more even pronounced.
Products include (untreated) western pine boards, patterns, pre-finished pine, rough lumber, purlins, cedar and (treated) wood foundations, square and round building poles, fence posts, dimension lumber and decking, bridge planks, and landscape and deck timbers.