HomeMy WebLinkAboutVivint
July 30, 2014
Neil Erickson
Hawaii County Public Works Building Division
Aupini Center, 101 Pauahi Street, Suite 7
Hilo, HI 96720
Re: Engineering Certification for the Mounting Systems, Inc. 13/52 Rail Span Chart
Dear Mr. Erickson,
This letter is to document that I have reviewed the Mounting Systems, Inc. 13/52 rail span chart and I have
found that it is in compliance with the requirements for the wind and seismic design for Hawaii County. These
requirements are acceptable up to a seismic design category E or less.
The effective wind pressure in Hawaii County is governed by a topographic factor, Kzt, a directionality factor,
Kd, a wind exposure and a wind speed. The topographic factor, Kzt is assumed to be 1.0 for the most general
case. The directionality factor, Kd is 0.85. The wind exposure category is B, C or D. Wind speed varies from 85
mph to 160 mph.
This Certification is for gable roof and hipped roof structures with height up to 30 feet and roof angle between 7
degree and 27 degree flush mount installations in 3 roof zones.
All systems where the panels are tilted up, and the systems that falls outside the above wind parameters, will
require engineering by a licensed Hawaii Structural engineer.
Following are typical specifications for the connections to meet the Hawaii County requirements:
Attachment Spacing: Mounting Systems, Inc. strongly recommends a maximum span of 8 feet, but in
any case, not to exceed the maximum span indicated on the charts.
Cantilever:
Tables
Clearance: m top of roof to bottom of PV panel
Roof Connection:
Standing Seam Roof:
1. ASGU2AL clamp of
screws.
2. Corrugated Bracket of EcoFasten Solar with #12 x .
1 of 6
Composition Shingle Roof:
1. GreenFaste GF1 of EcoFasten Solar(UER-
Tile Roof:
1. Tile Flashing System
Corrugated Metal Roof:
1. CorruSlide System of EcoFasten Solar -
screws.
This letter is to certify the mounting structures and roof attachment to the existing structural members. The
requirements of the overall structure need to be in compliance with the following codes:
1. Minimum Design Loads for Building and other Structures, ASCE/SEI 7-05
2. 2006 International Building Code, by International Code Council, Inc.
3. 2005 Aluminum Design Manual, by The Aluminum Association
4. AC428, Acceptance Criteria for Modular Framing Systems Used to support Photovoltaic (PV) Panels,
November 1 2012 by ICC-ES
5. Guidelines for Permitting a Residential Photovoltaic (PV) Roof Mounted System, January 1 2013 by
County of Hawaii
If the roof structure or any other structural component of the mounting structure do not meet with the
requirement above, then the installation need to be analyzed and designed by a licensed Hawaii structural
engineer.
If you have any questions on the above, do not hesitate to call.
Sincerely,
Paul Zacher, SE - President
2 of 6
3 of 6
4 of 6
5 of 6
6 of 6