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Pur′lin.


Carpentry.) A horizontal timber resting on a principal rafter, or a purlin-post, which is stepped into the ticbeam, and helps support the rafters of the roof. (See King-post truss.) In the cut:—

a, principal rafter.

b, purlin.

c, common rafter.

d, sheathing or slate-boarding.

Purlins are also known as side-timbers or sidewavers.

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