HomeMy WebLinkAbout2631 Shadow Ct - Special Inspections/Solar - 06/01/2016Domus Structural Engineering, LLC
1210 Birch Street
Broomfield, CO 80020
303-466-3014
= - Domusstructural@gmaii.com
June 1, 2016
To: Ecomark Solar
4665 Paris St. #300-C
Denver, CO. 80239 .�
Subject: Certification Letter Q 430.� M. Pillmore Residence /
2631 Shadow Cou ✓ z_,�-,,.
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Ft. Collins, C0.8052 s'f. �t� Digitally signed by
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John Calvert
�� Date:2016.06.01
To Whom It May Concern,. 14:59:51-06'00'
A jobsite observation of the condition of the existing framing system was performed by an audit team of Ecomark Solar as a
request from Domus Structural Engineering. All review is based on these observations and the design criteria listed below and
only deemed valid if provided information is true and accurate.
On the above referenced project, the roof structural framing has been reviewed for additional loading due to the installation of
the solar PV addition to the roof. The structural review only applys to the section of the roof that is directly supporting the solar
PV system and its supporting elements. The observed roof framing is described below. If field conditions differ, contractor to
notify engineer prior to starting construction.
The roof structure of (MP1&2) consists of composition shingle on roof plywood that is supported by pre -manufactured trusses
that are spaced at @ 24"o.c.. The top chords, sloped at 18 degrees, are 2x4 sections, the bottom chords are 2x4 sections and the
web members are 2x4 sections. The truss members are connected by steel gusset plates. The max unsupported projected
horizontal top chord span is approximately 6'-4".
The existing roof framing system of (MP1&2) is judged to be adequate to withstand the loading imposed by the installation of the
solar panels. No reinforcement is necessary.
The spacing of the solar standoffs should be kept at 72" o.c. for landscape and 48" o.c. for portrait orientation, with a staggered
pattern to ensure proper distribution of loads.
Design Criteria:
• Applicable Codes = 2012 IBC/IRC, ASCE 7-10, and NDS-12
• Roof Dead Load = 7 psf (MP1&2)
• Roof Live Load = 20 psf
• Wind Speed = 130 mph, Exposure C, Risk Category II
• Roof Snow Load = 30 psf
• Attachments: (1) 5/16" dia lag screw with 2.25" min embedment depth, at spacing shown above.
Please contact me with any further questions or concerns regarding this project.
Sincerely,
John Calvert, P.E.
Project Engineer
Pillmore Residence, Ft. Collins, CO 1
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