HomeMy WebLinkAboutENGINEERING LETTER - PAUL WELCHPAUL WELCH INC.
Mechanical Electrical Civil Engineering
1984 S.W. Biltmore St. Suite#114
May 20, 2019
Re: Van Putten Re -Roof
407 Nettles Blvd.
Jensen Beach, FL 34957
Port Saint Lucie, FL 34984
Phone (772) 785 - 9888
E-mail pwelchinc@aol.com
RECEIVED
MAY 21 2019
ST. Lucie county, Permitting
SCASNNED
St. Lucie Countv
SCOPE OF WORK:
Install new MetalRoof (Extreme Metal Fabricators, LLC "1.0 Nail Strip" FL #28059.1) at above
referenced address over new underlayment, and existing plywood sheathing.
DESIGN CRITERIA:
FBC 2017
ASCE7-10
PROJECT DATA:
BUILDING HIEGHT = 20'-0"
A= 3'
MEAN ROOF HIEGHT = <25'
ROOF ANGLE = 3:12
SHAPE = PTI'CHBD GABLE
ADJUSTMENT FACTOR = 1.00
IMPROTANCE FACTOR = 1.00
WIND VELOCITY V ult = 165NDH
WIND VELOCITY V asd =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
407 Nettles Blvd. Jensen Beach, FL
Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
May 20, 2019
1 of3
Metal roofing to be attached with corrosion resistant Pancake -Head wood screws #10 x 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 as follows:
ZONE 1 (Field): FASTENER SPACING = 6" O.C.
ZONE 2 (Perimeter/ Ridge): FASTENER SPACING = 6" O.C.
ZONE 3 (Comers): FASTENER SPACING = 6" O.C. WITH 3/8" BEAD OF LAP SEALANT
Design uplift Pressure for attachment as per above:
Product Design Pressure:
Zones 1& 2:-121,175 PSF
Zone 3: -168.5 PS
Therefore O.K.
Underlayment shall be Tri-Built Roofing Products FL# 16048.1 "Tri-Built S/A 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 # 28059.1), (FL# 16048.1),
manufacturer's specifications, and the Florida Building Code 2017.
407 Nettles Blvd. Jensen Beach, FL
Paul Welch Inc.
Paul Welch .E. Reg. No. 29945
20, 2019
Zof3
i
aA
ROOF ZONE PLAN
A=3'
Q 0, (D = ZONE DESIGNA770N (TYPICAL)
NOTE: PROVIDE LAP SEALANT FOR ALL ROOF PANEL LAPS
FOR ROOF ZONE I
407 Nettles Blvd..Jensen Beach, FL
"A'
Paul Welch Inc.
Paul Welc P.E. Reg. No. 29945
ay 20, 2019
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