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Project: <br />Location: <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: 2x4 Rafters @ 24" o.c. with a maximum unsupported horizontal span of 7'-0" and a slope of 22 degrees <br />ROOF 2: 2x4 Rafters @ 16" o.c. with a maximum unsupported horizontal span of 12'-0" and a slope of 22 degrees <br />Max PV mount spacing- Landscape config: 48", Portrait config: 48", Pattern: Staggered (ROOF 1) <br />Max PV mount spacing- Landscape config: 48", Portrait config: 48", Pattern: Staggered (ROOF 2) <br />Attachment to Framing: (1) 5/16" Lag Screw(s) w/ 2.5" min embed @ above spacing (ALL ROOFS) <br />Paymon Eskandanian, SE, PE <br />Laguna Consulting Engineers <br />2043 N ROSS ST <br />SANTA ANA, CA 92706 <br />Roof Dead Load(s): 8 psf, Comp Shingles (ROOF 1); 10 psf, Comp Shingles (ROOF 2) <br />CONCLUSIONS: <br />Please contact me should you have any questions or comments regarding this project. <br />Tran Residence <br />SANTA ANA, CA <br />30011 Ivy Glenn Dr, Ste 219, Laguna Niguel, CA 92677 <br />info@lagunaengineers.com <br />April 28, 2023 <br />Sunpower Corporation <br />1414 Harbour Way <br />South Richmond, CA 94804 <br />Tran Residence <br />New PV System Dead Load(s): 3 psf <br />Applicable Codes: 2022 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 />A jobsite observation of the condition of the existing framing system was performed by an audit team of Sunpower Corporation as a request <br />from Laguna Consulting Engineers. All review is based on these observations and the design criteria listed below and only deemed valid if the <br />provided information is true and accurate. <br />The scope of this report is strictly limited to an evaluation of the fastener attachment, underlying framing, and supporting structure with the <br />additional loading due to the installation of the solar PV panels. The design of racking (rail spans, mounting hardware, etc.), PV panels and all <br />other structure is by others and shall be per the specified design criteria. Laguna Consulting Engineers assumes no responsibility for improper <br />installation of PV panels, racking, or waterproofing. Prior to starting construction, contractor shall verify the framing sizes, spacings, and <br />spans noted in the stamped plans and this letter and notify the Engineer of Record of any discrepancies noted. This review relies on the roof’s <br />structural system having been originally designed and constructed in accordance with the building code requirements and having been <br />maintained to be in good condition. <br />ROOF 1: Adequate to support the imposed loading - No structural upgrades required <br />ROOF 2: Adequate to support the imposed loading - No structural upgrades required <br />Page 1 <br />EXP. 06/30/2024 <br />Preeti Agarwal, PE <br />Laguna Consulting Engineers <br />Preeti Agarwal <br />Preeti Agarwal <br />2023.04.28 <br />15:04:55-07'00' <br />2043 N Ross St <br />07/28/23