HomeMy WebLinkAboutEngineering Re-roof letter�#v
T.E. S C H LITT
E N G I N E E R I N G
October 14, 2021
Mr. Douglas Harvey, Building Supervisor/Building Official
St. Lucie County
Planning & Development Services
Building & Code Regulation Division
2300 Virginia Avenue
Fort Pierce, FL 34982
Subject: Re -Roof Letter — Cox Residence
Flat Roof Area Per Attached Sketch
7410 James Road
Fort Pierce, FL 34982
Engineer's Project Number: 21FO30
Dear Mr. Harvey:
RECEIV D -
OCT 2 1202
ST. Lucie County, Permitting
The above referenced project has existing roof covering systems that will be removed down to
the wood deck. The new roof systems will be installed per the following specifications.
Project Design Parameters
• Florida Building Code: Seventh Edition
• Building Occupancy Category: II
• Internal Pressure: Enclosed
• Wind Speed: Ultimate: 158 MPH
• Nominal / Allowable: 123 MPH
• Wind Exposure Category: C
• Size of Building (WxL): 50'x60'
• Height of Building: 10'-0"
• Slope of Roof Area: Sloped and Flat/Low
Sloped
• Edge Zone: 4'
• Corner: 4' x 4'
The existing roof covering and underlayment shall be removed, and the existing wood deck shall
be verified to be in sound condition. Any necessary sheathing repairs shall be performed per code
with minimum size of sheathing repairs to span three rafters/trusses (approximately 48"). The
existing deck and any repairs shall be re -nailed per current code requirements.
Roof Material Specifications for the Flat Roof
Florida Product Approvals: FL 2533.1 R26 CertainTeed, LLC Modified Bitumen Roof System W-67
UnderlaymentSystem: 75# base sheet mechanically attached
1555 Indian River Blvd., Suite B-145
Vero Beach, FL 32960
ittengineering.com
11
Mr. Harvey
October 14, 2021
EPN: 21F030 Page 2
The underlayment system shall be installed over minimum 19/32" thick, APA rated plywood. The
base layer shall be one of the following: Glasbase Base Sheet; Flintlastic Base 20; Flintlastic Poly
MSM Base Sheet, or Flintlastic Ultra Poly SMS Base Sheet with FlintFast 3 in. Insulation Plates
with FlintFast #14; orTrufast 3" Metal Insulation Plates with Trufast HD fastened perthe schedule
below:
Zone
Effective Area
(minimum)
Nominal (ASD) Wind
Load Pressure
Maximum Pressure per
method of
Manufacturer
+PSF
-PSF
We
96 SF
10.6
40.8
-105.0 PSF
2
96 SF
10.6
54.2
-105.0 PSF
3
16 SF
12.7
87.5
-105.0 PSF
All areas shall be fastened at 4" on center at 3" lap and 4" on center at four (4) equally spaced,
staggered center rows.
First Ply Roof Coverinq System: SBS-SA-H
The first ply shall be Black Diamond Base Sheet with 4" side laps and 6" end laps with end laps
diagonally staggered not less than 3' apart.
Roof Covering System: SBS-AA, SBS-TA, or APP-TA
The bonded roof cover shall be one of the following specifications, all three are approved for this
use. The contractor shall pick only one for the entire area unless approved by the manufacturer.
1. SBS-AA: Flintlastic FR Cap 30, Flintlastic FR Dual Cap, Flintlastic FR-P, Flintlastic Premium
FR-P, Flintastic GMS or any of these products in Coolstar type in hot asphalt at 20-40
Ibs/square.
2. SBS-TA: Flintlastic FR Cap 30, Flintlastic GTS-FR or either of these products in Coolstar type
as Torch -Applied.
3. APP-TA: Flintlastic STA, Flintlastic STA Plus, Flintlastic GTA, Flintlastic GTA Coolstar,
Flintlastic GTA-FR, Flintlastic GTA-FR Coolstar as Torch -Applied.
Roof Material Specifications for the Sloped Roof
FL 17322.1-R8 Atlas Roofing WeatherMaster Underlayment, FL 16305-R10 Atlas Shingles
Follow manufacturers product application requirements for additional installation requirements.
I have reviewed the above information and certify that to my best knowledge and belief; the
referenced method of attachment provides adequate resistance to the wind loads and forces
1555 Indian River Blvd., Suite B-145 T: 772.360.4998
Vero Beach, FL 32960 info@schlittengineering.com
Mr. Harvey
October 14, 2021
EPN: 21FO30 Page 3
specified by current code provisions. Should you have any questions regarding the above subject,
please call.
Very truly yours,
Terence Schlitt, P.E.
FL P.E. # 81238
TS/kw
cc: Mr. Paul Lucas, Lucas Roofing, Inc.
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1555 Indian River Blvd., Suite B-145
Vero Beach, FL 32960
T: 772.360.4998
info@schlittengineering.com