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http://www.jwkhomeinspections.com/blog/collar-ties-rafter-ties-purlins-san-antonio-home-inspector.html
Purlins are placed under rafters in a perpendicular position on edge (not flat). The purlins are supported by vertical or slightly angled bracing. The braces (struts or kickers) should be within every 4' and should not be at a greater than a 45 degree angle towards the roof slope (lower side).
https://www.chinhdaisteel.com/en/what-is-a-purlin/
Purlins are supported either by rafters or the walls of the building. They are most commonly used in metal buildings, though they sometimes replace closely spaced rafters in wood frame structures. Purlin
http://www.ashireporter.org/HomeInspection/Articles/Controlling-Rafter-Deflection-Knee-Walls-Purlins-and-Collar-Ties-as-Braces-/15077
Jun 01, 2017 · Think of knee walls as small bearing walls that support rafters. Typically, purlins are 2x4s or 2x6s. The purlin should be the same size as the rafter, at least. Think of purlins as small beams that run under the midpoint of all the rafters. Purlins are supported by 2x4 posts or struts. If the purlins are 2x4s, the posts usually are spaced every 4 feet.
https://roofconstruction-terminology.blogspot.com/2019/10/the-common-rafter-and-purlin-roof.html
Oct 10, 2019 · (1) The purlin is easier built-in or set in hangers at the gable walls. (2) The purlins allow the rafter to be birds mouthed over them, thus avoiding the tendency for the rafter to slide off the roof. A notch in the rafter can be used on sloping purlins but a birds mouth is easier to locate and a …
https://www.engineersedge.com/civil_engineering/purlin_roof_structure_9898.htm
Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and/or the building walls, steel beams etc. The use of purlins, as opposed to closely spaced rafters, is common in pre-engineered metal building systems and both the ancient post-and-beam and newer pole building timber frame construction methodologies.
https://wikidiff.com/rafter/purlin
As nouns the difference between rafter and purlin is that rafter is one of a series of sloped beams that extend from the ridge or hip to the downslope perimeter or eave, designed to support the roof deck and its associated loads or rafter can be a raftsman while purlin is a longitudinal structural member two or more rafters of a roof. As a verb rafter is to make (timber, etc) into rafters.
http://www.homeownersnetwork.com/booktopic/ceiling-joist-rafter-framing-details/
You may use purlins to support rafters that would otherwise span a greater distance than allowed by the IRC. Example: a properly installed purlin at the center of an 18 feet long rafter would allow you to use 9 feet as the rafter span distance.
https://www.quora.com/What-is-the-difference-between-rafter-purlin
Purlins are one which are parallel to the edge line or we can state they keep running along the traverse of the rooftop while rafters are opposite (design) to the edge line of the rooftop support . Purlin and beam are the essential structural steel members individuals from any rooftop structure.
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