HomeMy WebLinkAboutENGINEER LETTER - 19-00540 - 240 W 3rd N - Solar Panel
September 10, 2019
ONE SOLAR UTAH
2391 S 1650 W #C
Woods Cross, UT 84087
SOLAR PANEL ROOF CERTIFICATION LETTER
Jamison Residence
240 W 3rd North
Rexburg, ID 83440
One Solar Utah prepared calculations for the roof trusses located at the residence referenced
above. It was assumed that the lateral seismic and wind loads acting perpendicular to the trusses
were distributed to the roof sheathing and into the walls and were not included in the
calculations. The analysis was limited to each single roof truss and did not include any analysis
of the wall, footing, etc. The loadings and analysis were in accordance with the following codes
1. 2015 International Residential Code
2. ASCE 7-10 Minimum Design Loads for Buildings and Other Structures
3. 2015 National Design Specification for Wood Construction
1. Dead Load
a. Roof Members Self-weight
b. Roof Load 10 psf
c. Solar Panel 3 psf
d. Ceiling Loads 5 psf
2. Live Load 20 psf
3. Ground Snow Load 50 psf
4. Wind
a. 3 Second Wind Gust Velocity 115 mph
b. Importance Factor 1.0
c. Exposure C
5. Seismic
a. Site Classification D
b. Design Spectral Reponses
i. SDS 0.426
ii. SD1 0.226
c. Importance Factor 1.0
Based on the calculations of the existing trusses, the additional loading from the solar panels did
not cause any of the roof trusses to become overstressed.
Prepared By:
______________________________
Dereck Hodson, P.E.
Professional Engineer
State of Idaho
License No. 18199
Expires 31 Dec 2019
10-Sep-19