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DATE: 9/02/21 JOB ORDER #: 21-5038
CLIENT: Daley Brothers Roofing
ADDRESS: 490 Business Park Way - Suite A Royal Palm Beach, FL 33411
PROJECT: Galt Residence Wood Non-Insulated Roof Decks (3)
ADDRESS: 9701 S. Indian River Drive Fort Pierce, FL
2020 FBC/ASCE 7-16 DESIGN PRESSURE CALCULATIONS
Project Information:
Height = 8' & 10' Exposure: D Basic/Ultimate Wind Speed: Vult=170 mph
Length = 46', 24', 27' Category: II Nominal Wind Speed: Vasd=Vult*√0.6
Width = 44', 21', 16' Slope: < 7 (asd = allowable strength design)
Parapet Wall: < 3' Residential Kz = 1.03, Kzt = 1.0, Kd = 0.85
For multiple deck condition, the most conservative dimensions were utilized for design calcs.
Design Calculations:
Velocity Pressure: q = 0.00256*KzKztKdKeV2
Velocity Pressure (ult): q=0.00256(1.03)(1.0)(0.85)(1.0)(170)2 = 64.77 psf
Velocity Pressure (asd): q=0.00256(1.03)(1.0)(0.85)(1.0)(170*√0.6)2 = 38.86 psf
ASCE 7-16, FIGURE C30-1 "Four Possible Scenarios for Roof Zones"
Length = 46' Width = 44' 1.2h = 12' 2.4h = 24' 0.6h = 6' 0.2h = 2'
Effective Wind Area: <10ft2
For parapet height three feet (3') or larger, zone three (3) shall be treated as zone two (2).
Figure 30.3-2A
For calculating roof zone
dimensions only. Refer to
Diagrams to the Left for
Applicable Zones for this
Roof
Page 2, 9/02/21, Job Order # 21-5038
Daley Brothers Roofing - Galt Residence
Wood Non-Insulated Roof Decks (3)
9701 S. Indian River Drive; Fort Pierce, FL:
External Pressure Coefficient: Internal Pressure Coefficient:
GCP1' = -0.9 GCPi = 0.18
GCP1 = -1.7
GCP2 = -2.3
GCP3 = -3.2
Design Pressures Based on Vasd:
1) Field (Interior) : P1' = 38.86*[(-0.9) – (0.18)] = -42.0 psf
1) Field (Exterior) : P1 = 38.86*[(-1.7) – (0.18)] = -73.1 psf
2) Perimeter : P2 = 38.86*[(-2.3) – (0.18)] = -96.4 psf
3) Corners : P3 = 38.86*[(-3.2) – (0.18)] = -131.4 psf
Attachment Requirements Per RAS-117:
Based on the requirements of Florida Product Approval # FL1654-R27, Appendix 1, pg 25 of 94,
System No. W-119, with a maximum design pressure of -97.5psf; the following are our
recommended fastening patterns to attach the proposed Elastobase or Elastobase P base sheet to
the min. 19/32" plywood deck utilizing approved 11 ga. annular ring shank nails and 32 ga., 1-
5/8" diameter tin caps (see zone diagram):
P1' Field (Interior) : 4" o.c. @ 4" laps and 4 staggered rows 4" o.c.
P1 Field (Exterior) : 4" o.c. @ 4" laps and 4 staggered rows 4" o.c.
P2 Perimeter : 4" o.c. @ 4" laps and 4 staggered rows 4" o.c.
P3 Corners : 4" o.c. @ 4" laps and 5 staggered rows 4" o.c.
Notes:
• Additional testing (for example TAS-105, TAS-124, TAS-126) may be required by the
building department and/or the NOA/product approval for the installation of the above roof
system. Client must verify directly. FE&T can perform these additional tests, upon request.
• Contractor to verify that the fastening patterns meet manufacturer’s requirements for
issuance of a warranty (as applicable).
• All work shall be in compliance with the local building code product control notice of
acceptance and manufacturer specifications and Florida Building Code 2020 Edition.
• Wind load calculations based on ASCE 7-16, 2020 FBC, and information provided by client.
Client is responsible for verifying existing/proposed conditions/decks as it pertains to the
above provided product approval.
• All work shall be inspected by our field engineer (or authorized representative) or a buil ding
department inspector to verify compliance with specifications.
Sincerely,
______________________________
Reza Javidan, P.E.
Florida Engineering & Testing, Inc.
Florida Reg. No. 60223
Certificate of Authorization No. 6923