Stamped-PE IEBC Letter-Katz, CatherineFreedom Forever LLC, 43445 Business Park Dr Suite 110, Temecula, CA 92590
Subject: Structural Certification for Installation of Residential Solar
re job:KATZ, CATHERINE, 19 BRIGHT ST, NORTHAMPTON, MA 01060
Attn.: To Whom It May Concern
117 mph Ground Snow:40 psf
B Min Roof Snow:35 psf
Current Renewables Engineering Inc.
Professional Engineer
info@currentrenewableseng.com
Gravity Check:
D (psf) =
D + L (psf) =
D + S (psf) =
D + 0.75L + 0.75S (psf) =
Governing Load Value (psf) =
Governing LC =
Governing CD Factor =
D (psf) =
D + S (psf) =44.9 29.6
Loads Post-PV:
Roof 1 Roof 2
9.9 9.9
D + 0.75L + 0.75S D + 0.75L + 0.75S
1.25 1.25
46.7 43.7
46.7 43.7
24.9 20.9
41.9 41.9
Exposure Cat:
Loads Pre-PV:
Roof 1 Roof 2
6.9 6.9
4/27/2021
After review, we certify that the alteration to the existing structure by installation of the PV system meets
the requirements of the applicable codes and criteria shown below:
Design Criteria:
Code:2015 IEBC w/ 780 CMR (ASCE 7-10)
Ult Wind Speed:
Exp: 6/30/2022
CIVIL
NO. 56313
VAOSMS IAGHAHR
Date :4/27/2021
Job Code: KATZ, CATHERINE
2 of 3
Governing Load Value (psf) =
Governing LC =
Governing CD Factor =
(Load/CD)_postPV / (Load/CD)_prePV =
The increase in gravity loads as a result of the solar system is less than 5% of the existing structure and
therefore no further analysis is required.
Seismic Check:
Wall Weight (psf) =
Tributary Wall Area (ft2) =
Total Wall Weight (lbs) =
Roof Weight (psf) =
Roof Area (ft2) =
Total Roof Weight (lbs) =
Total Existing Weight (lbs) =
PV Panel Weight (lbs) =
Number of Panels =
Total Additional PV Weight (lbs) =
(Existing W + Additional W)/(Existing W) =103%
Limits of Scope of Work and Liability:
Existing structure is assumed to have been designed and constructed following appropriate codes at
time of erection, and assumed to have appropriate permits. The calculations produced are only for the
roof framing supporting the proposed PV installation referenced in the stamped planset 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 observable during time of inspection are not included in this scope of work. All PV modules,
racking, and mounting equipment shall be designed and installed per manufacturer's approved
installation specifications. The Engineer of Record and the engineering consulting firm assume no
Additional PV Weight:
54
26
1416
Weight Increase:
The increase in weight as a result of the solar system is less than 10% of the existing structure and therefore
no further seismic analysis is required.
2340
39780
7
1296
9001
48781
Existing Weight:
17
Gravity Load Increase:
1.05 0.74
D + S D + S
1.15 1.15
44.9 29.6
Date :4/27/2021
Job Code: KATZ, CATHERINE
3 of 3
responsibility for misuse or improper installation. This analysis is not stamped for water leakage.
Framing was determined based 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 cert letter (where applicable) and notify the
Engineer of Record of any discrepancies prior to starting construction. Contractor shall also verify that
there is no damaged framing that was not addressed in stamped plans, calculations, and cert letter
(where applicable) and notify the Engineer of Record of any concerns prior to starting construction.