HomeMy WebLinkAboutBLD-19-000282 RECEIVED
Tom Petersen I AUG o 2016
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Architects • Planners tiuimou.t rm�Nr
Construction Official August 18,2018
Building Department for project at:
153 Center Street
Yarmouth,MA 02675
Re: Solar Panel Installation-As-buil!Certification, Permit#BLD-19-000282
Norris Residence
153 Center Street
Yarmouth,MA 02675
Dear Sirs,
I've reviewed the as-built solar panel installation at this location to evaluate the existing roof
structure and the connection of the panels to the roof.
Criteria: Applicable codes: MA State Building Code-780 CM y y"Edition
(2015 International Residential-Code with MA Amendments)
2015 Wood Frame.Cc,istruction Manual
Design roof load: 30 psf live!cad, 10 psf dead load,40 psf total load
Design wind load: 140.:.Nn,35 psf;Exposure Category'B'
My findings are as follows.
I. The new solar panels will imply an additional dead load of 3 psf. The existing roof structure
(2x6 roof rafters @ 16"o.c.,with 2x4 bearing knee wall,2x4 collar ties and 2x8 ridge,span to
knee wall +/-8'-8"at maximum)is sufficient to bear this additional load.
2. The solar panels are attached to the roof with the SolarMount-1 rack system by IJNIRAC. The
rack system,roof connections and connection spacing are rated for 140 mph.This project
requires the larger Solar Mount 1-2.5 beam(2.5"high)and spacing of flange foot connection to
roof at 48"o.c.maximum. Flange footing connections to the rail are fiat required to be staggered.
The flange foot connections to the roof are 5/16"diameter x 4"long lag bolts.
The as-built installation is in compliance with these specifications, building codes and all
manufacturers requirements and recommendations.
I therefore certify that the actual installation complies with the applicable codes and design loads
mentioned above and is acceptable for approval. Please let me know if you have any questions
on this information. Thanks!
Sinly yours, t%--- A
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Tom Petersen sO HOWELL, Jy
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Cc: Neal Holmgren,Solar Rising LLC yhe trH OF FAlea
6 Country Lane•Howell,New Jersey 07731 •Telephone 732-730-1763,Fax 732-730-1783