HomeMy WebLinkAboutPV2022-076 - MiscZ 132 E • ocean Blvd.
June 14, 2021
Re: Solar RoofTM1° Structure Qualification Certification Letter
Solar RoofTm is a roofing system comprised of both PV and non-PV roofing elements. Please
refer to the product data sheets, third -party certifications, and installation documentation for
further information.
Installation of Solar RoofTM over a single layer of composite shingles is acceptable per the
manufacturer's installation instructions. If the existing roof has more than one layer of
shingles, or any non -comp shingle roofing, a full tear -off is required. The net installed weight
of the Solar RoofTM system is 3.1 psf, is evenly distributed, and no roofing overlays are
permitted. Consequently, the net additional loading impact to existing gravity load resisting
elements is less than 5%. This is applicable when 1) there is one layer of existing shingles or
when the unloading of existing roofing from a tear -off is performed, and 2) on all pitched roof
structures with existing roofing material comprised of comp shingle, slate, or concrete/clay tile.
Note that this assessment does not apply to structures with light weight roofing materials such
as metal, plastic, fiberglass, synthetic, or other roof coverings.
Where required by the installation manual or conditions above, Installer shall perform a full
tear -off of all existing layers of roofing material above existing sheathing/decking. Installer
shall verify existing roofing, and sheathing/decking meet installation instructions. Installer shall
verify roof framing is in suitable condition that does not exhibit any signs of structural damage
which may diminish the capacity of its members or connections prior to commencement of
roofing installation.
I certify that installation of the Solar RoofTM system on existing structures with: a) existing
roofing material comprised of comp shingle, slate, or concrete/clay tile and b) with no existing
structural damage; meets the criteria outlined in the "Alterations" section of the "Prescriptive
Compliance Method" chapter of the IEBC/CEBC and is therefore permitted by code without
alterations or strengthening of the existing framing.
Henry Zhu, P.E.
Civil Engineer, Tesla
yonzhu@tesla.com
Direct: (415) 992-1723
Licenses: AZ, CA, FL, MA, MD, NC, NJ, NM, SC, TX, UT, WA
Henry Zhu Digitally z;o6d4 0:51 Henry
T = 5 L Fi Tesla, Inc.
3500 Deer Creek, Palo Alto, CA 94304