HomeMy WebLinkAboutGutierrez - Engineering Letter.pdfDATE: 1/27/21
ENGINEERING & TESTING, INC.
Phone: (866) 781-6889 •Fax: (866) 784-8i50
www.floridaeugineeringandtesting.com
250 S.W.13th Avenue
Pompano Beach, FL 33069
JOB ORDER M 21-1341
CLIENT: Alliance Group
ADDRESS: 615 NW Enterprise Drive Port Saint Lucie, FL 34986
PROJECT: Gutierrez Residence Flat Wood Roof Deck
ADDRESS: 6009 S Indian River Drive Fort Pierce, FL
2020 FBC/ASCE 7-16 DESIGN PRESSURE CALCULATIONS
Proiect Information:
Height = 20' Exposure: D Basic/lAtimate Wind Speed: Vwt=170 mph
Length = 84' Category: II Nominal Wind Speed: Vaud=Vwt*40.6
Width = 44' Slope: < 7' (asd = allowable strength design)
Parapet Wall: < 3' Residential Kz =1.08, Kzt =1.0, Kd = 0.85
For multiple deck condition, the most conservative dimensions were utilized for design talcs.
Desisn Calculations:
Velocity Pressure: q = 0.00256*KzKztKdKeV2
Velocity Pressure (,it): q=0.00256(1.08)(1.0)(0.85)(1.0)(170)2 = 67.92 psf
Velocity Pressure (,sd): q=0.00256(1.08)(1.0)(0.85)(1.0)(170*�0.6)2 = 40.75 psf
ASCE 7-16, FIGURE C30-1 "Four Possible Scenarios for Roof Zones"
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Buildings with least horizontal Buildings with least horizontal Buildings with least horizontal Buildings with largesthorhontal
dimension greater than 2.4h dimension greater than 1.2h but dimension less than 1.2h and dimension less than 1.2h
less than 2.4h largest horizontal dimension
greater than 1.2h
Figure 3a3-2A
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For calculating roof zone
dimensions only. Refer to
Diagrams to the Leftfor
Applicable Zones for this
Roof
Length = 84' Width = 44' 1.2h = 24' 2.4h = 48' 0.6h =12' 0.2h = 4'
Effective Wind Area: <10ft2
For parapet height three feet (3') or larger, zone three (3) shall be treated as zone two (2).
V 1 `%i
Quality A .4 x trance
Page £,1/27/21, Job Order # 21-1341
Alliance Group
Gutierrez Residence - Flat Wood Roof Deck
6009 S Indian River Drive; Fort Pierce, FL:
External Pressure Coefficient:
GCP 1' = -0.9
GCPl
= -1.7
GCP2
= -2.3
GCP3
= -3.2
Not Applicable
Design Pressures Based on Vasd:
FLO A
Internal Pressure Coefficient:
GCPi = 0.18
1) Field (Interior) Pl' = 40.75*[(-0.9) — (0.18)] = -44.0 psf Not Applicable
1) Field (Exterior) PI = 40.75*[(-1.7) — (0.18)] = -76.6 psf
2) Perimeter P2 = 40.75* [(-2.3) — (0.18)] = -101.1 psf
3) Comers P3 = 40.75* [(-3.2) — (0.18)] = -137.7 psf
Attachment Requirements Per RAS-117:
Based on the requirements of Florida Product Approval # FL10264-R15, Appendix 1, pg 7 of 63,
System No. W-35, with a maximum design pressure of-82.5psf; the following are our
recommended fastening patterns to attach the proposed UltraPly TPO membrane bonded to UltraPly
TPO InvisiWeld Plates with RhinoBond Portable Plate Bonding Tool and weighted RhinoBond
Cooling Clamps through the preliminarily attached thermal barrier and/or insulation to the min.
19/32" plywood deck (attached to structural supports per product approval) utilizing approved
Firestone Heavy Duty Fasteners and UltraPly TPO InvisiWeld Plates (see zone diagram):
Pl' Field (Interior) :
6"
o.c. @ laps, in rows spaced @ a max.
of 60" o.c. Not Applicable
Pl Field (Exterior) :
6"
o.c. @ laps, in rows spaced @ a max.
of 60" o.c.
P2 Perimeter :
6"
o.c. @ laps, in rows spaced @ a max.
of 48" o.c.
P3 Comers :
6"
o.c. @ laps, in rows spaced @ a max.
of 35" o.c.
Notes:
• 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 building
department inspectpptV% gwRR iance with specifications.
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Sincerely,
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Troy Bishop, P.E.; o`:. S1nrE
Florida En eerin estiia P' G�'
Florida Reg. No. 76i3J FS
Certificate ofAuthorizafl6n 1p, bbl�3