»click here for available colors   Weather Rib Roofing & Siding Weather | Agro | Industrial | Standing | Colors Weather Rib roofing and siding is a popular all purpose steel profile. Its versatility makes it not only suitable for new building projects but for sheeting over older wooden buildings. Generous side laps give excellent protection against side lap leakage in extreme weather conditions. For a lifetime of protective coverage, Weather Rib is a superior choice. ALLOWABLE UNIFORM LOADS (lb per ft2) GAUGE PURLIN OR GIRT SPACING (in.) 12" 16" 20" 24" 29 68 38 26 18 NOTE: - Based on continuous load over three equal spans - Allowable loads determined by material strength or by limiting deflection of 1/180 of the span - Grade A steel having a minimum yielding stress of 33,000 psi GAUGES: 29 gauge (inquire on other guages) WIDTH: 32" Coverage LENGTHS: 1 foot through 25 feet in one inch increments GALVANIZED COATINGS: Hot-dipped zinc coated steel conforms to the requirements of ASTM A525M (coating designation Z275) PREPAINTED COATINGS: Exterior dry thickness of 1.0 mil., underside dry film thickness of .5 mil. Prepainted coating applied over Z275 galvanize. (Inquire on color selection)