HomeMy WebLinkAboutENGINEERING LETTERA "
April 23, 2019
Re: Case Re -Roof
1272 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
RECEIVED
APR 2 3 2019
ST. Lucie county, Pnrmltt[n9
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.
DESIGN CRITERIA:
FBC 2017
ASCE7-10
PROJECT DATA:
BUILDING HIEGHT = 18'-0"
A= 3'
MEAN ROOF HIEGHT = <23'
ROOF ANGLE = 5:12
SHAPE = PITCHED GABLE
ADJUSTMENT FACTOR =1.00
EMPROTANCE 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 (Comers) = -99.8 Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
Aprfl23, 2019
1272 Nettles Blvd. Jensen Beach, FL 1 of 3
METAL ROOFING ATTACHMENT REOUIREMENTS:
Metal roofing to be attached with corrosion resistant Hex -Head wood screws #10 x 1 ''V2"
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 = 8" O.C.
ZONE 2 (Perimeter/ Ridge): FASTENER SPACING = 8" O.C.
ZONE 3 (Comers): FASTENER SPACING = 8" O.C.
Design uplift Pressure for attachment as per above:
Product Design Pressure: Zones 1, 2 & 3: -101 PSF
Therefore O.K.
UNDERLAYMENT•
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 # 17022.1), (FL# 16048.1),
manufacturer's specifications, and the Florida Building Code 2017.
Paul Welch Inc.
Paul Welch P.E. Reg. No. 29945
April23„2019
1272 Nettles Blvd. Jensen Beach, FL ✓ 2 of 3
so
A"
ROOF ZONE PLAN
A=3'
Q, Q;(D= ZONE DESIGNAT70N ('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
April23, 2019
1272 Nettles Blvd. Jeasc¢ Beach, FL 3 of 3
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