HomeMy WebLinkAboutSolar affidavit 41822 SOLAR
Yarmouth, MA C � April 18, 2022
Town of Yarmouth1146 Route 28
S. Yarmouth, MA 02664 �02
RE: HANSEN, HOLLY; LEW,ARI G pEPP Trinity Solar No.
16 Checkerberry Lane �o\ , 2022-03-675119
West Yarmouth, MA 02673 c)y
To the Building Official:
I hereby certify that I am a Licensed Professional Engineer in the State of Massachusetts. The solar photo-voltaic(PV)
system installed at the above-referenced location conforms to the manufacturers' requirements/specifications. The PV
system complies with all applicable laws, codes, and ordinances—specifically the International Building Code (2015
edition) and the International Residential Code (2015 edition), including all Massachusetts regulations and
amendments. Trinity Solar was on-site during the final inspection under direct supervision.
Regards,
Thor Bojcun, PE
Structural Engineer-Trinity Solar
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MA License No.56687
Trinity Solar 120 Patterson Brook Rd Unit 10 I West Wareham,MA I(508)291-0007
SOLAR 0 151021
Yarmouth, MA i-MMarch 22, 2022
Town of Yarmouth1146S. Yarmouth MA 02664 Route 28 BO""°\N PAR
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RE: HANSEN, HOLLY; LEW,ARI Trinity Solar No.
16 Checkerberry Lane 2022-03-675119
West Yarmouth, MA 02673
To the Building Official:
The following information constitutes a summary of the relevant design criteria and recommendations for the support of a
new photovoltaic[PV] system on the existing roof framing components at the above-referenced location.
Criteria is as follows:
1. Existing roof framing:
Conventional roof framing at R2 is 2x6 at 16 o.c.; existing rafter span= 12' 10"; (horizontal projection)
Conventional roof framing at R3 is 2x6 at 16 o.c.; existing rafter span= 12' 0"; (horizontal projection)
2. Roof Loading:
• 3.0psf dead load (pounds per square foot- PV panels, mounting rails& hardware)
• 5.7psf-existing roof loads (1.7 psf-2x6 framing, 1.5psf roof sheathing, 2.5 psf shingles)
• Ground Snow Load- 30psf-per AHJ (Authority Having Jurisdiction)
• Wind criteria- Exposure Category B, 140 mph wind
3. Existing roof modification -none required; existing roof framing is acceptable for PV installation.
This installation design is in general conformance with the manufacturers' specifications and complies with all
applicable laws, codes, and ordinances—specifically the International Building Code (2015 edition) and the
International Residential Code (2015 edition), including all Massachusetts regulations and amendments.
The spacing and fastening of the mounting brackets is a maximum of 48" o.c. between mounting brackets (staggered)
and is secured using 5/16"diameter corrosive-resistant steel lag bolts. A minimum of 21/" of penetration (embedment)
per lag bolt is required,which will resist all stated loads above—including wind shear. Per NDS Section 12.1.4,
clearance holes-equal to the diameter of the shank-need to be bored into a primary framing member for the
full-length of the threaded portion of the bolt to avoid splitting of the framing member.
Regards,
Thor Bojcun, PE
Structural Engineer-Trinity Solar
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MA License No.56687
Trinity Solar 120 Patterson Brook Rd Unit 10 I West Wareham,MA I(508)291-0007