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Purlin

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purlin [′pər·lən]
(building construction)
A horizontal roof beam, perpendicular to the trusses or rafters; supports the roofing material or the common rafters.

purlin, purline
purlins
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.

Purlin 

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).



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As well, you may be able to mount the antenna to a truss or a purlin under the metal roofing.
They use 50,000 PSI decking and stiffed Purlin materials.
The company has unveiled plans, which include the introduction of the new long span purlin G-2 (second generation).
 
 
 
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