HomeMy WebLinkAboutROOF REPLACEMENTCB Engineering Services,`�'_2.
1301 711 Street, Suite 303, Hallandale Beach, FL. 33009
Phone: 954-534-1612 Email: cbbortes(ilgmail.com
To: City of Port Saint Lucie
Building Department
121 SW Port St. Lucie Boulevard SI,HIVNEd Port St. Lucie, FL 34984 BY
Re: Roof Replacement Recommendations 3t. LuCje (%011ntV
7133 US-1
Port St. Lucie, FL
The deck consisting of metal panels to be replaced with 18-22 ga., Type B, Grade 33 steel decking
attached to steel joists supports spaced 5 ft. o.c. with Buildex Traxx/4 or 5 fasteners spaced 6" o.c.
(at the bottom flute), and with side laps attached with Buildex Traxx/I fasteners spaced at max. of
24" o.c., and at the roof perimeter, where applicable, to concrete tie beams with '% inch x1 % inch
tapcons spaced at maximum 24 inch o.c.
Metal roof deck to be covered as per NOA No.: 13-1022.18 Deck Type 21, System Type B(1) as
described on page 6 of 22, and RAS 117
The 1 inch Perlite insulation boards of 4 feet by 4 feet shall be laid down staggered and
anchored to the metal deck with Drill-Tec #12x4" fasteners thru a Drill-Tec 3 inch steel plate,
using a fastening pattern of 1:2 ft2 as per NOA No: 13-1022.18
669.6 152.4
-24'. -1 6. IV
+ + V 1524
i
+ t
t +
8 FastJbd
Figure 1 Suggested Insulation Fastener Patterns
MINIMUM M DIAMETER
MINIMUM a W. GAM OR
PAINTEDSTEELSHEET
MINIMUM a' WIDTH
Figure 2-Use of Steel Sheet to Ensure Support of Insulation Panels -As Per Ras 117
Page 1 of 4
CB Engineering Services, ".
1301 IVC 7th Street, Suite 303, Hallandale B�.uh, FL. 33009
Phone: 954-534-1612 Email: cbbortes(a2gmail.com
Re: Wind Load -Pressure Computation -as per ASCE 7-10
Calculation results using the ASD Design Method with a Load Factor of 0.6 of the MecaWind
Pro v2.2.7.0 per ASCE 7-10 Software are on Page 3 of this report.
Computation Results for the Building Envelope
Roof Field
10.78 psf and -30.64 psf
Roof Perimeter
22.98 psf and -36.32 psf
Roof Corner
27.53 psf and -42.47 psf
MecaWind Pro v2.2.7.0 per ASCE 7-10
Developed by MECA Enterprises, Inc. Copyright w w.mecaenterprises.com
Date 2/7/2017
Project No. 2717
Company Name CB Engineering Services,
INC.
Designed By Constantin
Bortes
Address 1301 NE 7 St. #303
Description Wind load
pressure
calculation
City Hallandale
Customer Name Customer
State FL
Proj Location 7139 US-1,
Port St.
Lucie, FL
Input Parameters: Directional
Procedure All
Heights Building (Ch 27 Past 1)
Basic Wind Speed(V) =
160.00
mph
Structural Category =
I1
Exposure Category
=
C
Natural Frequency =
N/A
Flexible Structure
=
No
Importance Factor =
1.00
Ed Directional Factor
= 0.85
Alpha =
9.50
Zg
= 900.00
ft
At =
0.11
Bt
= 1.00
Am =
0.15
Bm
= 0.65
Cc =
0.20
1
= 500.00
ft
Epsilon =
0.20
Zmin
= 15.00
ft
Pitch of Roof =
0 :
12
Slope of Roof(Theta)
_ .00
Deg
h: Mean Roof Ht
15.00
ft
Type Of Roof
= FLAT
RHt: Ridge Ht =
15.00
ft
Eht: Rave Height
= 15.00
ft
OH: Roof Overhang at Eave=
.00
ft
Overhead Type
= No Overhang
Bldg Length Along Ridge =
570.00
ft
Bldg Width Across Ridge= 175.00
ft
Gust Factor Calculations
Gust Factor Category I Rigid Structures - Simplified Method
Gustl: For Rigid Structures (Nat. Freq.>1 Hz) use 0.85 = 0.85
Gust Factor Category II Rigid Structures - Complete Analysis
Zm:
0. 6'Ht
= 15.
00 ft
lzm:
Cc*03/Zm)^0.167
= 0.23
Lzm:
1;(Zm/33)^Epsilon
= 427.06
ft
Q:
(1/(1+0.63*((B+Ht)/Lzm)^0.63))^0.5
= 0.85
Gust2:
0.925*((1+1.7`lzm-3.4*Q)/(1+1.7-3.4*1zm))
= 0.85
Gust Factor Summary
Not a Flexible Structure use the Lessor of Gustl or Gust2 = 0.85
Table 26.11-1 Internal Pressure Coefficients for Buildings, GCpi
GCPi : Internal Pressure Coefficient = +/-0.18
Wind Pressure on Components and Cladding (Ch 30 Part 1)
Page 2 of 4
CB Engineering Services, -
5 1301 rae 7th Street, Suite 303, Hallandale E.h, FL. 33009
Phone: 954-534-1612 Email: cbbortesAmmail.com
Gable Roof 8 c 7
3
All pressures shown are based upon ASD Design, with a Load Factor of 0.6
Width of Pressure Coefficient Zone "a" _ = 7.00 ft
Description Width Span Area Zone Max Min Max P Min P
ft ft ft^2 GCp GCp psf psf
Roof Field 7.00 80.002133.3 1 0.20 -0.90 10.78 -30.64
Roof Perimeter 7.00 80.002133.3 2 0.63 -1.10 22.98 -36.32
Roof Corners 7.00 7.00 49.0 3 0.79 -1.32 27.53 -42.47
Khcc:Comp. 6 Clad. Table 6-3 Case 1 = 0.85
Qhcc:.00256-V^2•Khcc*Kht•Kd = 28.37 psf
GENERAL NOTES:
1. For Situations that require Kd =1.0, table values listed below are under -designed. Please verify
Kid requirements with local municipality.
2. This specification is intended to illustrate design wind pressures as listed on the page 3.
3. Use of these tables and corresponding wind velocity, exposure, and other coefficients listed
herein shall be dictated and verified by the governing building department and permit holder. No
warranty for applicability of table value use is offered herein.
4. This specification is not intended to offer any product approved certification. Please refer to any
separately submitted test criteria and other approvals for design & installation information and
applicability of these table values which is to be verified by others in accordance with governing
codes.
5. Please adhere to all local impact protection system ordinances.
6. No certification is offered for the integrity of the host structure.
7. Except as expressly provided herein, no additional certifications or affirmations are intended.
8. The Component table on page 3 was produced based on information (such as openings sizes
and locations of openings) supplied to us by the Client.
THIS DOCUMENT IS THE PROPERTY OF CB ENGINEERING SERVICES, INC. AND SHALL
NOT BE REPRODUCED IN WHOLE OR PART WITHOUT THE WRITTEN CONSENT OF
UNDERSIGNED. ALTERATIONS, ADDITIONS, OR OTHER MARKINGS TO THIS DOCUMENT
ARE NOT PERMITTED AND INVALIDATE OUR CERTIFICATION.
FF -- 81�& w
.. , C
ILIZ.2-a opf
Page 3 of 4
CB Engineering Services,'" 2.
1301 1xr 7fh Street, Suite 303, Hallandale B� . ;h, FL. 33009
Phone: 954-534-1612 Email: cbbortes(cDgmail.com
We believe that proposed roof replacement and the proposed roof covering to be done by NOA
No.: 13-1022.18 Deck Type 21, System Type B(1) as described on page 6 of 22, and RAS 117
will suffice to meet the requirements of ASCE 7-10 (from NOA No.: 13-1022.18 page 7 of 22
maximum design pressure is 45 psf, and our calculation shows a pressure of maximum 42.47
psf) and the 51 Edition of the 2014 Florida Building Code.
"Engineer seal is valid for pages 1 through 4. See attached drawing/s for information not shown
herein"
Sincerely,
CB Engineering Services, INC.
(CA # 30935)
Signed by: Constantin Bortes M.S., P.E.
Florida P.E. # 77915
Date: February 7, 2017
Aim
Page 4 of 4