Definition of purlin in English:


Line breaks: pur¦lin
Pronunciation: /ˈpəːlɪn


A horizontal beam along the length of a roof, resting on principals and supporting the common rafters or boards.
More example sentences
  • Sinking the posts 18 to 24 inches deep will keep them from pushing in below ground level, and the roof beams or purlins supporting the glazing do the same for the top of the posts.
  • Roofs can be upgraded from thatch or asphalt-impregnated cardboard to clay tiles if the initial roof rafters and purlins are sized at the beginning to carry the weight of the heavier clay tiles.
  • Insertions include three insulated wood stud curtain walls, steel Y-braces and I-beam purlins to aid roof support, and steel tension cables for lateral resistance.


late Middle English: perhaps of French origin.

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