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Tom Petersen
Architects Planners
Mr.Thomas J. St. Pierre,Inspectional Services Director March 30, 2013
City of Salem Inspectional Services
120 Washington Street, 3`d floor
Salem, MA 01970
Re: Solar Panel Installation
Dibble Residence
74 Moffatt Road
Salem,MA 01970
Permit 9628-13
Hi Tom,
I've reviewed the solar panel installation at this location to evaluate compliance with the original
structural review letter(dated April 27,2012,copy attached)and the manufacturer's
specifications for assembly and installation. , . o ,
The actual installation complies with the original design intent and parameters as well as
specifications and instructions set forth by the manufacturer of the panels and rack system. I therefore
approve the installation.
Please let me know if you have any questions on this information. Thanks!
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Tom Petersen o� �Pa
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6 Country Lane•Howell,New Jersey 07731 •Telephone 732-730-1763,Fax 732-730-1783
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Tom Petersen
Architects Planners
Mr.Thomas J. St.Pierre,Inspectional Services Director April 27,2012
City of Salem Inspectional Services
120 Washington Street, 3`d floor
Salem,MA 01970
Re: Solar Panel Installation
Dibble Residence
74 Moffatt Road
Salem,MA 01970
Hi Tom,
I've reviewed the proposed solar panel installation at this location to evaluate the existing roof
structure and the connection of the panels to the roof.
Criteria: Applicable codes: 8d'Edition Residential Code(2009 International Residential
Code with Massachusetts Amendments)
2001 Wood Frame Construction Manual
Design roof load: 40 psf live load, 15 psf dead load, 55 psf total load
Design wind load: 110 mph,35 psf
My findings are as follows.
1. The new solar panels will imply an additional dead load of 3 psf. The existing roof structure
(wood roof trusses @ 16"o.c.,with 2x4 chords and rafters,+/- 11'-8"span) is sufficient to
bear this additional load.
2. The solar panels are attached to the roof with the SolarMount-1 rack system by UNIRAC. The
rack system, roof connections and connection spacing are rated for 110 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 not required to be staggered.
The flange foot connections to the roof are 3/8"diameter x 4"long lag bolts.
I therefore certify that this 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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Tom Petersen ;oy HJ os
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Cc: Kelcy Pegler, Roof Diagnostics
6 Country Lane•Howell,New Jersey 07731 •Telephone 732-730-1763,Fax 732-730-1783