HomeMy WebLinkAboutEngineering Approval \0PO
�. 'RECEIVED
PAUL WELCH INC. JUN 2019
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Mechanical Electrical Civil Engineering gln g Permitting Department !
1984 S.W.Biltmore St. Suite#114 st;pude county
Port Saint Lucie,FL 34984
Phone(772) 785 -9888
E-mail pwelchinc@aol.com
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June 19,2019 �f
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Re: Martin Re-Roof
1055 Nettles Blvd.
Jensen Beach,FL 34957
SCOPE OF WORK:
Remove existing roofing. Install new Metal Roof(Extreme Metal Fabricators,I LLC "1.0 Nail
Strip"FL#20378.2)at above referenced address over new underlayment, and existing plywood
sheathing. j
DESIGN CRITERIA: I �,
FBC 2017
ASCE7-10
PROJECT DATA:
BUILDING HIEGHT=20'-0"
A=3'
MEAN ROOF HIEGHT=X25'
ROOF ANGLE=3:12
SHAPE=PITCHED GABLE
ADJUSTMENT FACTOR= 1.00
IMPROTANCE FACTOR= 1.00 j
WIND VELOCITY V ult= 165MPH
WIND VELOCITY V asd= 128 MPH
EXPOSURE=D
ENCLOSURE CLASS=ENCLOSED BUILDING
INTERNAL PRESSURE COEFFICIENT=-0.18
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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.
Ronald J.Price P.E. Reg.No. 17788;
June 19, 20199
1055 Nettles Blvd.,Jensen Beach,FL 1 of 3
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METAL ROOFING ATTACHMENT REOUIREMENTS:
Metal roofing to be attached with corrosion resistant Pancake-Head wood screws#10 z 1"
minimum(minimum 3/16"penetration through deck). Fasteners shall be placed through the nail
strip at 16"on center across panel width and spacing along the nail strip asfoil ws:
ZONE 1 (Field): FASTENER SPACING=6"O.C.
ZONE 2 (Perimeter/Ridge): FASTENER SPACING=6"O.C.
ZONE 3 (Corners): FASTENER SPACING=6" O.C. WITH 3/8"BEAD OF LAP SEALANT
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Design uplift Pressure for attachment as per above:
Product Design Pressure:
Zones 1&2: -69.25PSF
Zone 3: -121.75 PSF
Therefore O.K.
UNDERLAYMENT:
Underlayment shall be Tri-Built Roofing Products FL# 16048.1 "Tri-Built S/�HT TU".
While priming is optional, TRI-BUILT recommends priming the deck if the final roof cover is
not slated for installation within 24 hours.
Apply sheet parallel to the roof edge. Roll out approximately 10 ft of membrane and peel back
the first 3 ft of release film.
Adhere the exposed part to the substrate and unroll the remaining membrane as far as possible.
Once the entire length of membrane is in place,peel-off the release film diagonally while
holding the membrane tight.Firmly roll the membrane into place to achieve a bond. Horizontal
seams should be minimum 3-inches, configured to shed water. Vertical seams should be 6inches
and staggered not less than 2-ft from vertical seams in the course below. All over-granule end-
laps shall be sealed using either heat-welding or hot air welding techniques.For Valleys and
Ridges: Cut underlayment into 4 to 6 foot lengths.Peel the release paper and center sheet over
valley or ridge. Drape and press sheet into place, working from the center of the valley or ridge
in each direction. For valleys, apply the sheet starting at the lowest point and work upward.
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#203 78.2), (FL# 160 18.1),
manufacturer's specifications,and the Florida Building Code 2017.
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Paul Welch Inc.
Ronald J.Price P.E. Reg.No. 17788
June 19, 2019
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1055 Nettles Blvd.,Jensen Beach,Fl, 2 of 3
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ROOF ZONE PLAN
A=3'
ZONE DESIGNATION(TYPICAL)
NOTE: PROVIDE LAP SEALANT FOR ALL ROOF PANEL LAPS
FOR ROOF ZONE 3.
Paul Welch Inc.
Ronald J.Priv U N
P.E, 17788
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1055 Nettles Blvd,Jensen Beach,FL 3 of 3