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XRS Flush Span Chart
April 2010 sales@ironridge.com www.ironridge.com XRS Rail for Flush Mount SPAN CHART & ENGINEERING GUIDE XRS Maximum Spans (feet) 0 psf Snow 10 psf Snow 20 psf Snow 30 psf Snow 40 psf Snow Exposure Wind Speed (mph) Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 Zone 1 Zone 2 Zone 3 90 mph 13.5 13.5 10.5 12.5 12.5 10.5 10.5 10.5 10.5 10.0 10.0 10.0 9.0 9.0 9.0 100 mph 13.5 12.0 9.5 12.5 12.0 9.5 10.5 10.5 9.5 10.0 10.0 9.5 9.0 9.0 9.0 110 mph 13.5 11.5 9.0 12.5 11.5 9.0 10.5 10.5 9.0 10.0 10.0 9.0 9.0 9.0 9.0 120 mph 13.5 10.5 8.5 12.5 10.5 8.5 10.5 10.5 8.5 10.0 10.0 8.5 9.0 9.0 8.5 130 mph 13.5 9.5 7.5 12.5 9.5 7.5 10.5 9.5 7.5 10.0 9.5 7.5 9.0 9.0 7.5 140 mph 12.5 9.0 7.0 12.5 9.0 7.0 10.5 9.0 7.0 10.0 9.0 7.0 9.0 9.0 7.0 Category B 150 mph 11.5 8.5 6.5 11.5 8.5 6.5 9.5 9.5 9.5 10.0 8.5 6.5 9.0 8.5 6.5 90 mph 13.5 11.0 8.5 12.5 11.0 8.5 10.5 10.5 10.5 10.0 10.0 8.5 9.0 9.0 8.5 100 mph 13.5 9.5 8.0 12.5 9.5 8.0 10.5 9.5 8.0 10.0 9.5 8.0 9.0 9.0 8.0 110 mph 13.0 9.5 7.5 12.5 9.5 7.5 10.5 9.5 7.5 10.0 9.5 7.5 9.0 9.0 7.5 120 mph 12.0 8.5 7.0 12.0 8.5 7.0 10.5 8.5 7.0 10.0 8.5 7.0 9.0 8.5 7.0 130 mph 11.0 8.0 6.5 11.0 8.0 6.5 10.5 8.0 6.5 9.5 8.0 6.5 9.0 8.0 6.5 140 mph 10.0 7.5 6.0 10.0 7.5 6.0 10.0 7.5 6.0 9.5 7.5 6.0 8.5 7.5 6.0 Category C 150 mph 9.5 7.0 5.5 9.5 7.0 5.5 9.5 7.0 5.5 9.0 7.0 5.5 8.5 7.0 5.5 LOAD CONDITION ASSUMPTIONS ♦ Flush roof mounting installations only ♦ Roof pitch must be 27 degrees or less ♦ Module length is 67.5” or less ♦ Building height must be less than or equal to 15 feet ♦ Clearance between roof and rail is at least 2 inches ♦ End cantilever span not to exceed 40% of the adjacent interior span ♦ No rail splice permitted within the middle ½ of the span For installations that do not conform to the load condition assumptions, please contact your local distributor or refer to www.ironridge.com for a more complete engineering analysis.