HomeMy WebLinkAboutENGINEERING LETTER - PAUL WELCHFebruary 25, 2019
Re: Ward Re -Roof
939 Nettles Blvd
Jensen Beach, FL
PAUL WELCH INC.
Mechanical Electrical Civil Engineering
1984 S.W. Biltmore St. Suite#114
Port Saint Lucie, FL 34984
Phone (772) 785 - 9888
E-mail pwelchinc@aol.com
SCANNED
BY
St. Lucie County
SCOPE OF WORK:
Install new Metal Roof (Extreme Metal Fabricators, LLC "5-V Crimp" FL #17022.1) at above
referenced address over new underlayment, and existing plywood sheathing.
DESTGN CRYI'ERIA:
FBC 2017
ASCE7-10
PROJECT DATA:
BUILDING HIEGHT=12'-0"
A= 3"
MEAN ROOF HIEGHT = <20'
ROOF ANGLE = 5:12
SHAPE = PITCHED GABLE
ADJUSTMENT FACTOR = 1.00
IMPROTANCE FACTOR = 1.00
WIND VELOCITY V ult = 165WH
WIND VELOCITY V esd= 128 MPH
EXPOSURE = D
ENCLOSURE CLASS = ENCLOSED BUILDING
INTERNAL PRESSURE COEFFICIENT = -0.18
ZONE 1 (Field) _ -40.3
ZONE 2 (Perimeter/ Ridge) _ -68.0
ZONE 3 (Corners) _ -99.8
939 Nettles Blvd Jensen Beady FL
Paul•Welch Inc.
Paul Welch P.E. Reg. No. 29945
,February 25, 2019
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Metal roofing to be attached with corrosion resistant Hex -Head wood screws #10 x I %"
minimum with weather sealing washers (minimum 3/16" penetration through deck). Fasteners
shall be placed through the panel ribs at 12" on center across panel width and spacing along the
ribs as follows:
ZONE 1 (Field): FASTENER SPACING =16" O.C.
ZONE 2 (Perimeter/ Ridge): FASTENER SPACING = 16" O.C.
ZONE 3 (Comers): FASTENER SPACING = 8" O.C.
NOTE: PROVIDE LAP SEALANT FOR ALL ROOF PANEL LAPS FOR ROOF
SLOPES UNDER 3 VERT.:12 HORZ.
Design uplift Pressure for attachment as per above:
Product Design Pressure: Zones 1 & 2:-93.5PSF / Zone 3:-101PSF
Therefore O.K.
UNDERLAYMENT:
Undeilayment shall be in accordance with manufacturer's guidelines, FBC 1507.4.5.1, and FBC
15074.5.2. Underlayment shall be Polyglass Polystick TU Plus FL# 5259.1
DECK INSTALLATION:
Re -nail all plywood sheathing (15/327 thick minimum) with 8D ring -shank nails at 4" O.C.
perimeter and 6" O.C. field for all zones.
All work to be in compliance with product approval (FL # 17022.1), manufacturer's
specifications, and the Florida Building Code 2017.
939 Nettles Blvd Jensen Beach, FL
Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
February 25, 2019
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ROOF ZONE PLAN
A=3 ,
Q1,Q2 ,Q3 = ZONE DESIGNA2YON ('TYPICAL)
NOTE: PROVIDE LAP SEALANT FOR ALL ROOF PANEL LAPS FOR ROOF
SLOPES UNDER 3 VERT.:12 HORZ.
Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
February 25, 2019
939 Nettles Blvd Jensen Beach, FL 3 of 3