HomeMy WebLinkAboutENGINEERING PLAN - 22-00404 - 35 S Hidden Valley Rd - 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
May 31, 2022
Intermountain Wind and Solar
Attn: Ryan Shaw
1041 North 950 West
Centerville, UT 84014
RE: 35 S Hidden Valley Road, 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 2001 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 25 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. Additionally, Section 706.2 of the International Existing Building Code (IEBC) 2018 indicates
that 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
5-31-2022