HomeMy WebLinkAboutREVISED LETTER & PLAN - 22-00189 - 562 E 4th S - Solar Panels
9089 S 1300 W Suite 160, West Jordan, Utah 84088
Phone: 801-707-9004 Fax: 801-590-6611
Website: www.perigeecivil.com
Email: info@perigeecivil.com
March 31, 2022
Intermountain Wind and Solar
Attn: Ryan Shaw
1953 W 2425 S
Woods Cross, UT 84087
RE: 562 East 4th South, Rexburg, ID
Structural Evaluation for Solar Panel Installation
Dear Ryan,
This letter is regarding the residence at the above referenced address. It’s our understanding that
Intermountain Wind and Solar would like to add solar panels to the structure in the area shown in the
attached sketch.
The solar panels proposed by Intermountain Wind and Solar are less than 4 pounds per square foot
(psf). The home was constructed in 2014 with pre-manufactured trusses, and typical design loads for
roofs in residential construction of that era are 10-15 psf, with a roof live load design of 20 psf and
roof snow load of 35 psf. Based on typical materials used in residential construction for asphalt roofs,
actual dead loads are generally less than that, around 7-8 psf. This would allow for 2-3 psf to be
added.
In compliance with the IRC 2018, which references Section 706.2 of the International Existing
Building Code (IEBC) 2018, alterations to a building which results in less than 5% of a gravity load
increase may be performed without structural evaluation of the existing structure, which would allow
an additional 2 psf. Because of these factors, it is our opinion that the roof is structurally adequate to
support the additional dead weight of the proposed solar panels. Supports from the array to the roof
should not be spaced greater than 4’ apart, and connections between adjacent railing rows should be
staggered.
Please contact me if you have questions or need further information.
Sincerely,
Letizia Wetzel, PE
3-10-2022
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Total Area of Array(s): 252ft²Pass Through Boxes Mounted Flush on Installation Surface (26.5º)System Size: 5.11kWMeter Upgrade: NO Standard Asphalt Shingle RoofArray(s) Azimuth: 180ºAnchored on 48" Centers using UL Listed Snap N Rack UR-40 System (14)(14)
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#
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:
INTERMOUNTAIN WIND & SOLAR
1041 N 950 W SUITE 500
CENTERVILLE, UT 84014
P: 801-298-5255
F: 801-298-5355
PROJECT #
SYSTEM SIZE:
AHJ:
DATE:
2022-185-ID
5.11kW - (14) Modules
Rexburg
03/09/2022
Designer
Revision
Elaine Lake
562 East 4th South
Rexburg, Idaho 83440
T.Schoen
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