SRC Letter - Powers, Myles (1)DATE: 09-29-2020/Rev E
FOR: Freedom Forever JOB: Powers, Myles
43445 Business Park Dr 92590
#110
218 Drury Lane
Northampton, MA 01027
Temecula, CA 92590
USA
To Whom It May Concern
This letter is to certify that we have performed a structural analysis of the existing roof members that are to
support photovoltaic panels, as shown on the attached report. The calculations were performed in accordance
with the latest editions of IBC, NDS, ASCE/SEI, CBC, and IRC, and the 9th edition 2015 Massachusetts
building code.
Our analysis was based on the following design criteria:
Ground Snow (psf) 40 psf
Sloped Snow (psf), reduced per ASCE, Sect. 7.4 37.09 psf
Basic Wind Speed (mph): 115 mph
Roof Slope: 22 degrees
The PV module orientation: Landscape
The maximum horizontal roof mount spacing:4 ft.
The maximum vertical roof mount spacing: 3.25 ft.
Staggered roof mounts required? Yes
Based on this analysis, we can certify that the individual existing roof framing members that support the
PV panels; and the individual roof members as described in the attached report; are adequate to support the
design loads as required by the various codes. This includes Dead Loads (including the weight of the PV
panels), Live Loads, Snow Loads, and Wind Loads, on the roof members that support the PV panels,
combined as required in the codes.
If you have any questions on this or need further clarification,
please contact us at your convenience.
Sincerely, James A. Adams, S.E.
NOTE:
1. Prior to commencement of work, the Solar Installer shall verify
that the roof framing sizes, spacing, and spans (between supports),
are as noted in these plans. The Engineer of Record must be
notified if any discrepancies are discovered, before proceeding.
2. These plans are Stamped for Structural Code compliance of
the roof members that support the PV solar system only.
3. These plans are not stamped for rain water leakage prevention.
4. As a precaution, old or wet snow should be removed from the roof,
if the snow builds up to 18" or more.
Digitally Signed by
James A. Adams, S.E.
Date: 2020.09.30 08:50:23 -0700
Date of Report: 09-29-2020/Rev E Job Name: Powers, Myles
Data Input by: Kevin Nguyen Job Number: F060986
Contact E-mail: kevin@yoursolarplans.com Job Address: 218 Drury Lane
Contact Phone: 7148721728 Northampton, MA 01027
ABSTRACT
This Report is based on Engineering calculations
using the input data supplied by the user, listed
under Current Input Data. The user input has not
been independently reviewed by a licensed
Professional Engineer for appropriateness or
accuracy, unless Stamped by a P.E. This Report
indicates Compliance/Non-Compliance with the
reference Codes listed below. The following items
have been checked for Code Compliance:
- Load Combination #1:
Wind Uplift on the Standoff attachment to
the Roof Framing members: Wind Uplift -
0.6 * DL Solar
- Load Combination #2:
Supporting Rafter Strength with: DL Rf +
DL Solar + Roof Live Load
- Load Combination #3:
Supporting Rafter Strength with: DL Rf +
DL Solar + Wind Down
- Load Combination #4: Supporting Rafter
Strength with: DL Rf + DL Solar + Snow
- Load Combination #5:
Supporting Rafter Strength with: DL Rf +
DL Solar + .75Wind + .75Snow
- Load Combination #6: Check Additional
Seismic Load
- Load Combination #7:
Supporting Rafter Strength with:
Wind Up - 0.6 * (DL Rf + DL Solar)
Job Information
Data Input By:Kevin Nguyen
Job Number: F060986
Job Name: Powers, Myles
Job Address: 218 Drury Lane
City, State: Easthampton, MA 01027
Current Input Data
Payment Method Invoice
Roof Type SingleSpanRafters
Ceiling Type 1/2 gyp. Bd.
Collar Tie Space 0
Coverage % 41.4
Frame Size 2-2x6@24
Ground Snow (psf) 40
Sloped Roof Snow Load (psf) 37.09
Lag Screw Diam. (in) 5/16
Lag Screw Embed. (in) 2.5
Overall Span (ft) 27.5
PV Weight (psf) 2.5
PV Module Orientation Landscape
Rafter Span (ft) 12
Rail System RailLess
Roof Mean Height (ft) 25
Roof Slope (degrees) 22
Roofing Type Comp. Shingle
Sloped Ceiling No
Max. Horizontal Roof Mount(ft) 4
Max. Vertical Roof Mounts (ft) 3.25
Standoff Staggered Yes
Wind Exposure C
Wind Speed (mph) 115