Laserfiche WebLink
Notes: <br />x Tables are based on strength of the InvisiMount rail and approved roof attachment in the Engineering <br />Summary Letter of this document, in conformance with IBC and referenced standards. <br />x Maximum allowable cantilever is equal to 1/3 of the allowable span. <br />x Wind speeds are ultimate values in mph, as defined in ASCE 7. Wind pressure coefficients are derived from <br />wind tunnel testing in conformance with ASCE 7 Chapter 31. <br />x Tables are valid for mean roof height ≤ 30 ft, gable end width ≤ 40 ft, and ridge length ≤ 60 ft. <br />x Tables apply to any location on the roof, except that PV modules must be set back at least 10 inches from all <br />ridges and roof edges. <br />x User is responsible for verifying the strength of the roof. <br />x User is responsible for verifying the capacity of the module. Module pressures are provided above and are <br />derived from the Wind Tunnel Test Report. The user must confirm that the design capacities of the module <br />are greater than both the uplift and downforce pressured identified. <br />Document #524734 Rev G, Vol. 10 7 SunPower Proprietary <br />InvisiMount Span Tables <br />Part 1: Simplified Tables (Wind Tunnel Loads) <br />How to Use These Tables <br />x Determine whether the site meets all the conditions listed below. <br />Yes No <br /> Mean roof height is 30 feet or less <br /> Gable end width (or smaller dimension if no gable) is 40 feet or less <br /> Ridge length (or longer dimension) is 60 feet or less <br /> Roof slope is 4:12 to 8:12 <br /> Seismic acceleration Ss is ≤ 3.73g (note, this covers the entire United States) <br /> Site is not located on a ridge or hilltop <br /> All PV modules are set back at least 10 inches from ridges and roof edges <br />If any boxes are checked No, use the General (ASCE 7 Analytical Method) tables, found in Part 2 of this <br />document. <br />x Select the table corresponding to the Exposure Category and Ground Snow load of the site. <br />x Determine the wind speed and roof slope for the site. The value in the first table, for this wind speed and <br />roof slope, is the allowable span between attachment points, in inches. <br />2105 N <br />St08/28/23