HomeMy WebLinkAboutSolar Panel Certificate Tom Petersen
Architects • Planners
Construction Official October 1 1, 2019
Building Department for project at:
9 Mackenzie Road
Yarmouth, MA 02654
Re: Solar Panel Installation—As-built Certification
Reilly Residence
9 Mackenzie Road 1111q
Yarmouth, MA 02654
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 CMR,9`h Edition
(2015 International Residential Code with MA Amendments)
2015 Wood Frame Construction Manual
Design roof load: 30 psf live load, 10 psf dead load,40 psf total load
Design wind load: 134 mph,35 psf; Exposure Category `B'
My findings are as follows.
1. The new solar panels will imply an additional dead load of 3 psf. The existing roof structure
(Roof#1: 2x8 roof rafters @ 16"o.c., with 2x10 ridge; Roof#2 and#3: 2x6 roof rafters @ 16"o.c.,
with 2x8 ridge; span= +/- 10'-4"maximum at all roof planes) is sufficient to bear this additional load.
2. The solar panels are attached to the roof with the XR-100 solar mount system by IronRidge.
The mounting system, roof connections and connection spacing are rated for 134 mph. This
project requires the spacing of flange foot connection to roof at 48"o.c.maximum. Flange
footing connections to the rail are not required to be staggered. The flange foot connections to
the roof are 5/16"diameter x 4" long lag bolts,with minimum 2 ''/z"embedment into the rafters.
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!
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