HomeMy WebLinkAboutStructural - 114037_ Dobbs, Donald_REV11/5
RE:CERTIFICATION LETTER
Project Address: DONALD DOBBS RESIDENCE
753 NORTHEAST CYPRESS STREET
PORT SAINT LUCIE, FL 34952
Design Criteria:
- Applicable Codes = 2020 FLBC/FLEBC 7th Edition, 2020 FLRC 7th Edition, 2018 IEBC/IBC/IRC, ASCE 7-16 and 2018 NDS
- Risk Category = II
- Wind Speed = 160 mph, Exposure Category C, Partially/Fully Enclosed Method
- Ground Snow Load = 0 psf
- Roof 1&2 : 2 x 6 @ 24" OC, Roof DL = 10 psf, Roof LL/SL = 20 psf (Non-PV), Roof LL/SL = 0 psf (PV)
To Whom It May Concern,
Sincerely,
December 14, 2021
Yuri Yurianto, S.E., P.E.
A job site survey of the existing framing system of the address indicated above was performed . All structural evaluation is based on the
site inspection observations and the design criteria listed above.
Existing roof structural framing has been reviewed for additional loading due to installation of PV Solar System on the roof. The
structural review applies to the sections of roof that is directly supporting the solar PV system.
Based on this evaluation, I certify that the alteration to the existing structure by installation of the PV system meets the prescriptive
compliance requirements of the applicable existing building and/or new building provisions adopted/referenced above.
Additionally, the PV module assembly including attachment hardware has been reviewed to be in accordance with the manufacturer’s
specifications and to meet and/or exceed the requirements set forth by the referenced codes.
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com
By Yuri at 9:49:48 AM, 12/14/2021
2/5
Roof 1&2 OK
ROOF
Roof 1&2
STANDOFF HARDWARE EVAULATION FOR WIND UPLIFT
UPLIFT DCR
RESULT
93.6%
ROOF PITCH (deg.)
11°
RESULTS SUMMARYBARUN CORP
DONALD DOBBS RESIDENCE, 753 NORTHEAST CYPRESS STREET, PORT SAINT LUCIE, FL 34952
ROOF
MOUNTING PLANE STRUCTURAL EVALUATION (BASED ON IEBC 5% IMPACT CHECK)
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com
3/5
PV module weight 2.5 psf
Hardware assembly weight 0.5 psf
PV-DL 3.00 psf
Existing Roofing Material 2 layers 5 psf
Underlayment 0.5 psf
Plywood Sheathing 1.5 psf
Framing Weight 2 x 6 @ 24 in. O.C.1.15 psf
Vaulted ceiling No 0 psf
Miscellaneous 1.5 psf
Total Roof Dead Load R-DL 9.65 psf
EXPRESSION
Roof Live Load Lo 20.0 psf
Member Tributary Area At < 200 sf
Roof 1&2 Pitch 3/12 or 11°
Trubutary Area Reduction R1 1
Slope Roof Reduction R2 1
Reduced Roof Live Load Lr = Lo (R1) (R2)20.00 psf
Ground Snow Load pg 0
Effective Roof Slope 11°
Snow Importance Factor Is 1.0
Snow Exposure Factor Ce 1.0
Snow Thermal Factor Ct 1.1
Minimum Flat Roof Snow Load pf-min 0
Flat Roof Snow Load pf 0.00
Roof Slope Factor Cs-roof 1.00
ps-roof 0.00
Roof Slope Factor Cs-pv 0.98
ps-pv 0.00
(Unobstructed slippery surfaces)
BARUN CORP Roof 1&2
LOAD CALCULATION
DONALD DOBBS RESIDENCE, 753 NORTHEAST CYPRESS STREET, PORT SAINT LUCIE, FL 34952
VALUE
VALUE
Comp Roof
SLOPED ROOF SNOW LOAD ON PV PANEL
SLOPED ROOF SNOW LOAD ON ROOF
SNOW LOAD
REDUCED ROOF LIVE LOAD (Lr)
(All other surfaces)
MATERIALROOF DEAD LOAD (R-DL)
PV SYSTEM DEAD LOAD (PV-DL)
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com
4/5
EXISTING
9.65 psf
20.00 psf
0.00 psf
EXISTING
23.72 psf
8.39 psf
23.72 psf
-40.76%OK
2018
DONALD DOBBS RESIDENCE, 753 NORTHEAST CYPRESS STREET, PORT SAINT LUCIE, FL 34952
Roof Snow Load (SL) =
The requirements of section 806.2 of 2018 IEBC are met and the structure is permitted to remain unaltered.
IEBC Provision :
Load Increase (%) =
(DL + Lr) / Cd =14.05
(DL + SL) / Cd =11.00
Maximum Gravity Load =14.05
0.00
WITH PV PANEL
WITH PV PANEL
Roof Dead Load (DL) =12.65
Roof Live Load (Lr) =0.00
BARUN CORP IEBC 5% IMPACT CHECK
Roof 1&2
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com
5/5
160 11°
II Gable
C 0.85
15 1
3.00 0.85
982.50
4.00
3.40
3.00
3.40
3.00
3.40
ROOF ZONE GCp (-) UPLIFT
1 & 2e -2.00
2n - 3e -3.00
3r -3.60
BARUN CORP WIND CALCULATION
Roof 1&2
DONALD DOBBS RESIDENCE, 753 NORTHEAST CYPRESS STREET, PORT SAINT LUCIE, FL 34952
SITE INFORMATION
Ultimate Wind Speed (mph) = Roof Pitch (deg.) =
Risk Category :Roof Type :
Array Edge Factor (γE) =1.50
Exposure Category :Kd =
Mean Roof Height (ft) =Kzt =
Solar Array Dead Load (psf) =Kz =
DESIGN CALCULATIONS
qh = 0.00256*Kz*Kzt*Kd*Ke*V2 =47.29
a (ft) =3.00
Solar Array Pressure Eq. Factor (γa) =0.60
Hardware Type :SFM INFINITY MICRORAIL WITH UNIRAC SFM INFINITY RAIL-LESS
Allowable Load (lb) =lbs, S.Pine 2.5" Embedment
Max. X - Spacing (ft) (Zone 1 & 2e)Effective Wind Area (ft2)
Max. Y - Spacing (ft) (Zone 1 & 2e)13.60
Max. X - Spacing (ft) (Zone 2n - 3e)Effective Wind Area (ft2)
Max. Y - Spacing (ft) (Zone 2n - 3e)10.20
Max. X - Spacing (ft) (Zone 3r)Effective Wind Area (ft2)
* Wind calculation is based on ASCE 7-16, 29.4 - C&C, LC#7: 0.6D + 0.6W used.
Max. Y - Spacing (ft) (Zone 3r)10.20
-90.16 919.63
UPLIFT PRESSURE (psf) PULLOUT FORCE (lbs)
-49.30 670.53
-74.84 763.36
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com
Coefficients
PLAN
FIGURE 30.3-2B Components and Cladding [h ≤60 ft (h ≤18.3 m)]: External Pressure Coefficients, (GCp ), for Enclosed and Partially
Enclosed Buildings—Gable Roofs, 7°<θ ≤20°