When framing the 8 ft. Corrugated Galvanized Steel Utility-Gauge Roof Panel, where should the screws be attached?

The screws should be placed in the valley of the corrugations to keep from crushing the ribs.

When attaching the 8 ft. Corrugated Galvanized Steel Utility-Gauge Roof Panels to framing members or plywood, the screws should be placed in the valley of the corrugations to keep from crushing the ribs.