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Silos and bins 48' (14.63 m) diameter and larger have a two-stage roof supported by "C" shaped, roll formed galvanized rafters and purlins.
The silo roof panels are connected to the silo eave with rib clips and center clips.
The silo and bin roofs of 39 (11.89 m) and 42 (12.80 m) diameter silos have a tubular support ring with expandable connectors attached to the exterior of the roof midway between the eave and the segment ring.