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Project: <br />Location: <br />Calc. by: <br />Date: <br />STRUCTURAL CERTIFICATION LETTER <br />To: <br />Project: <br />To Whom It May Concern: <br />DESIGN CRITERIA: <br />DESCRIPTION OF EXISTING ROOF STRUCTURE: <br />ROOF 1 to 3- 2x4 Rafters @ 24" o.c. with a maximum unsupported horizontal span of 10'-0" and a slope of 20 degrees <br />CONCLUSIONS: <br />Max PV mount spacing- Landscape config: 48", Portrait config: 48", Pattern: Staggered (ROOF 1 to 3) <br />Attachment to Framing: 1 - 5/16" Lag Screw(s) w/ 2.5" min embed @ above spacing (ALL ROOFS) <br />Sincerely, <br />Paymon Eskandanian, SE, PE <br />Laguna Consulting Engineers/ Laguna Pacific Group <br />This review relies on the roof’s structural system having been originally designed and constructed in accordance with the building code <br />requirements and having been maintained to be in good condition. The design of racking, rails, panels and all other hardware is <br />outside of the scope of this report. All components and waterproofing shall be installed per manufacturer specifications. Laguna <br />Pacific Group assumes no responsibility for improper installation of solar PV panels, racking, or waterproofing. <br />Please do not hesitate to contact me should you have any questions or comments. <br />2401 N Hathaway St <br />Santa Ana, CA 92705 <br />Minnis Residence <br />Santa Ana, CA <br />PE <br />11/12/202128202 CABOT ROAD, SUITE 300 <br />LAGUNA NIGUEL, CA 92677 <br />November 12, 2021 <br />Enphase Energy <br />47281 Bayside Parkway <br />Fremont, CA 94538 <br />Minnis Residence <br />A structural evaluation of the existing roof structure to support a new roof-mounted Photovoltaic (PV) system and its attachment to <br />the underlying structure was performed based on the Design Criteria noted below. <br />The structural review only applies to the section of the roof that is directly supporting the solar PV system and its supporting elements. <br />Contractor shall verify the framing sizes, spacings, and spans noted in the stamped plans and accompanying calculations and notify <br />the Engineer of Record of any discrepancies prior to starting construction. <br />ROOF 1 to 3- Adequate to support the imposed loading - No structural upgrades required <br />Roof Dead Load(s): 9 psf, Comp Shingles (ROOF 1 to 3) <br />Applicable Codes: 2019 California Building Code, ASCE 7-16 <br />Risk/ Occupancy Category: II <br />Roof Live Load(s): 20 psf, 0 psf Under PV <br />Ground Snow Load: 0 psf <br />Basic Wind Speed: 110 mph, Exposure Category: C <br />LAGUNA <br />CONSULTING ENGINEERS <br />LAGUNA PACIFIC GROUP, INC. <br />Page 1 <br />12/21 <br />2401 N Hathaway <br />08/17/22