HomeMy WebLinkAboutEngineering 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
September 20,2016
Re: Rasmussen Re-Roof
1291 Nettles Blvd
Jensen Beach, FL 34957
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.
DESIGN CRITERIA:
FBC 2014
ASCE7-10
PROJECT DATA:
BUILDING HIEGHT= 10'-0"
A=3'
MEAN ROOF HIEGHT=<20'
ROOF ANGLE=3:12
SHAPE=PITCHED GABLE
ADJUSTMENT FACTOR= 1.00
IMPROTANCE FACTOR= 1.00
WIND VELOCITY V ult= 165MPH
WIND VELOCITY V asd= 128 MPH
EXPOSURE=D
ENCLOSURE CLASS=ENCLOSED BUILDING
INTERNAL PRESSURE COEFFICIENT=-0.18
APPLIED UPLIFT DESIGN PRESSURES PER ASCE (PSF):
ZONE 1 (Field)=-40.3
ZONE 2 (Perimeter/Ridge)_-68.0
ZONE 3 (Corners)_-99.8 : Paul Welch Inc.
Pahl Welch-P.E. Reg. No. 29945
September 20, 2016
1291 Nettles Blvd Jensen Beach,FL 1 of 3
METAL ROOFING ATTACHMENT REQUIREMENTS:
Metal roofing to be attached with corrosion resistant Hex-Head wood screws#10 x 1 %1'
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 (Corners): FASTENER SPACING= 8"O.C.
Design uplift Pressure for attachment as per above:
Product Design Pressure: Zones 1 &2: -93.5PSF/Zone 3: -101PSF
Therefore O.K.
UNDERLAYMENT:
Underlayment shall be in accordance with manufacturer's guidelines, FBC 1507.4.5.1, and FBC
15074.5.2.-Underlayment shall be UDL 25 plus NOA# 13-0730.01.
DECK INSTALLATION:
Re-nail all plywood sheathing(15/32"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), (NOA# 13-0730.01.),
A-11
specifications, and the Florida Building Code 2014.
Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
September 20, 2016
1291 Nettles Blvd Jensen Beach,FL / 2 of 3
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Paul Welch Inc.
Paul Welch P.E. Reg.No. 29945
September 20,2016
1291 Nettles Blvd Jensen Beach,FL 1 3 of 3