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STRUCTURAL CRITERIA FOR RESIDENTIAL FLUSH-MOUNTED SOLAR ARRAYS 1.ROOF CHECKS A. Visual Review/Contractor’s Site Audit of Existing Conditions: 1)Is the roof a single roof without a reroof overlay? Y N 2)Does the roof structure appear structurally sound, without signs of alterations or significant structural deterioration or sagging, as illustrated in Figure 1? Y N B. Roof Structure Data: 1) Measured roof slope (e.g. 6:12):________:12 2) Measured rafter spacing (center-to-center):_______ inch 3) Type of roof framing (rafter or manufactured truss): Rafter Truss 2.SOLAR ARRAY CHECKS A. Flush-mounted Solar Array: 1)Is the plane of the modules (panels) parallel to the plane of the roof? Y N 2)Is there a 2” to 10” gap between underside of module and the roof surface? Y N 3)Modules do not overhang any roof edges (ridges, hops, gable ends, eaves)? Y N B. Do the modules plus support componenets weigh no more than: 4 psf for photovoltaic arrays or 5 psf for solar thermal arrays? Y N C. Does the array cover no more than half of the toal roof area (all roof planes)? Y N D. Are solar support component manufacturer’s project-specific completed worksheets, tables with relevant cells circled, or web-based calculator results attached? Y N E. Is a roof plan of the module and anchor layout attached? (see Figure 2) Y N F. Downward Load Check (Anchor Layout Check): 1)Proposed anchor horizontal spacing (see Figure 2):____’ - ____”ft-in 2)Horizontal anchor spacing per Table 1:____’ - ____”ft-in 3)Is proposed anchor horizontal spacing less than Table 1 spacing? Y N G. Wind Uplift Check (Anchor Fastener Check): 1)Anchor fastener data (see Figure 3): a.Diameter of lag screw, hanger bolt or self-drilling screw:_______ inch b.Embedment depth of rafter:_______ inch c.Number of screws per anchor (typically one):_______ d.Are 5/16” diameter lag screws with 2.5” embedment into the rafter used, OR does the anchor fastener meet the manufacturer’s guidelines? Y N 3.SUMMARY A. All items above are checked YES. No additional calculations are required. B. One or more items are checked NO. Attach project-specific drawings and calculations stamped and signed by a California-licensed Civil or Structural Engineer. Job Address: ___________________________________________ Permit #: ________________________ Contractor/Installer: _____________________________________ License # & Class: _________________ Signature: ____________________________ Date: ____________ Phone #: ________________________ Optional Additional Rafter Span Check Criteria [ At option of CBO, insert rows (4) to (7) below into table above after row 1.B.(3) ] 1.ROOF CHECKS B. Roof Structure Data: 4)Measured rafter size (e.g. 13/4 x 33/4, not 2x4):____ x ____ inch 5)Measured rafter horizontal span (see Figure 4):____’ - ____”ft-in 6)Horizontal rafter span per Table 2:____’ - ____”ft-in 7)Is measured horizontal rafter span less than Table 2 span? Y N Truss (Jurisdictions may delete “Optional Additional Rafter Span Check” at bottom of this page, or incorporate into main list of Structural Criteria above) 1206 W 18th St 09/18/23