HomeMy WebLinkAboutPLANS 23-458 1119 Morgan St, PV solar 2023-08-28814 E 1475 N
Lehi, UT 84043
m: (309) 645-0999
Solar Professional Engineering Consulting 2023.07.19 admin@lucenteng.co
Redrocks Roof and Solar LLC
3514 W 29th Ave, Apt 4
Denver, CO 80211
RE: Engineering Services
Gillam Residence
1119 Morgan St, Estes Park, CO
4.64 kW System
Solo Job #3743638
To Whom It May Concern,
A. Assumptions from Field Observation provided by Redrocks Roof and Solar LLC
Roof Roof B
Roof Finish : Metal Roofing (min. 26 ga.)Metal Roofing (min. 26 ga.)
Roof Underlayment : OSB OSB
Roof Profile : Gable Gable
Roof Structural System : Metal Plate Trusses Metal Plate Trusses
Truss Top Chord/Setup : 2 x 6 / Scissor 2 x 6 / Scissor
Chord/Rafter Wood Grade : Doug-Fir #2 or better Doug-Fir #2 or better
Truss/Rafter Spacing : 24'' o.c.24'' o.c.
Roof Slope : 18 deg 18 deg
Max Top Chord/Rafter Span : 9.51 ft 3.17 ft
Bearing Wall Type : Convl Lt-Frame Constr CLFC
Foundation : Permanent Concrete Permanent Concrete
Stories : Single Single
B. Building Design Criteria
Code : 2015 IRC (ASCE 7-10)Risk Category : II
Roof Live Load : 20 psf (0 psf at panels)Occupancy Class : R-3
Ground Snow Load : 60 psf Roof Dead Load : 4.9 psf
Ult Wind Speed : 175 mph PV Dead Load : 3 psf
Exposure Category : C Total Dead Load : 7.9 psf
C. Summary of Existing Structure Results
Roof
- Adaquate to support the additional imposed loads. No structural upgrades are required.
Lucent Engineering, P.C.
August 25, 2023
We have reviewed the following information regarding the solar panel installation for this project. Alterations to
these documents or plans shall not be made without direct written consent of the Engineer of Record.
The following structural design regarding the proposed alterations have been prepared from these assumptions.
The verification of the field observations is the responsibility of the contractor. Prior to commencement of
work, the contractor shall verify the framing sizes, spacings, and spans noted in the sealed plans,
calculations, and/or certification letter and notify the Engineer of Record of any discrepancies.
After review of the field observations and based on our calculations and in accordance with the applicable
building codes and current industry standards, the existing roof structure supporting the proposed
alterations consisting of the solar array has been determined to be:
D. Solar Panel Support Bracket Anchorage
1.
2. Manufacturer's Panel Bracket Connection to Roof Chord/Rafter Member:
Fastener : (4) 1/4" x 1" Self-Piecing Screws per Brack
NDS Withdrawl Value : 313 lbs/bracket
Min. Thread Length and Pentration Depth : 1''
3.
E. Overall Summary
Sincerely,
Michael Leeper, PE
License No. PE.0053507
Limits of Scope of Work and Liablity
Page 2 of 2
Gillam Residence
Should you have any questions regarding this letter or if you require further information, do not hesitate to
contact me.
Considering the existing roof's slope, size, spacing, condition, and calculated loads, the panel bracket
supports shall be placed no greater than 48 in. o/c.
Solar panels shall be designed, mounted, and installed in accordance with the most recent
''ProteaBracket Manual'', which can be found on the S-5 website (http://www.s-5.com).
Based on the information supplied to us at the time of this report, on the evaluation of the existing structure, and
solar array panel bracket connection, it is our opinion that the roof system will adequately support the additional
loads imposed by the solar array. This evaluation conforms to 2015 IRC and current industry standards.
The existing structure is assumed to have been designed and constructed following appropriate codes at the
time of erection and assumed to have appropriated permits. The calculations performed are only for the roof
framing supporting the solar array installation referenced in the stamped plans and were completed according to
generally recognized structural analysis standards and procedures, professional engineering, and design
experience opinions and judgements. Existing deficiencies which are unknown or were not observed during the
time the site observation are not included in this scope of work. All solar panel modules, racking, and mounting
equipment shall be designed and installed per the manufacturer's approved installation specifications. The
Engineer of Record and the engineering consulting firm assume no responsibility for misuse or improper
installation. This analysis is not stamped for water leakage. Framing was determined on information in provided
plans and/or photos, along with engineering judgement. Prior to commencement of work, the contractor shall
verify the framing sizes, spacings, and spans noted in the stamped plans, calculations, and/or certification letter
and notify the Engineer of Record of any discrepancies prior to starting construction. If during solar panel
installation, the roof framing members appear unstable or deflect non-uniformly, our office should be notified
before proceeding with the installation. The contactor shall also verify that there are no damage/deficiencies
(i.e., dry rot, water damage, termite damage, framing member/connection damage, etc.) to framing that was not
addressed in the stamped plans, calculations, and/or certification letter and notify the Engineer of Record of any
concerns prior to starting construction.
Lucent Engineering, P.C.August 25, 2023
08/25/2023