HomeMy WebLinkAboutDESIGN PRESSURE CALCULATIONS1 2A ENGINEERING & TESTING, INC.
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DATE: 7/11/18 � +fflfl ORDER #: 18-2867
CLIENT: All Area Roofing
ADDRESS: 3921 S. US Highway 1 Fort Pierce, FL 34982
PROJECT: Haselgrove Residence Flat Wood Non -Insulated Roof Deck
ADDRESS: 2207 Barbara Avenue Fort Pierce, FL
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2017 FBC/ASCE-7 DESIGN PRESSURE CALCULATIONS
Proiect Information:
Height = 10' Exposure: C Basic/Ultimate Wind Speed: V„tr=170 mph'
Length = 26' Category: II Nominal Wind Speed: Vasd=V„ it*40.6
Width = 22' Slope: < 7° (asd = allowable strength design)
Parapet Wall: N/A Residential KZ = 0.85, Kzt =1.0, Kd = 0.85
Design Calculations:
Velocity Pressure: q = 0.00256*KX tKaV2
Velocity Pressure (uit): q=0.00256(0.85)(1.0)(0.85)(170)2 = 53.45 psf
Velocity Pressure (.d): q=0.00256(0.85)(1.0)(0.85)(170*40.6)2 = 32.07 psf
Width of Pressure Coefficient: 0.1(22') = 2.2'
0.4(10') = 4.0' } use: 3'0"
Effective Wind Area: <1 Oft2
For parapet height three feet (T) or larger, zone three (3) shall be treated as zone two (2).
External Pressure Coefficient: Internal Pressure Coefficient: i
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1) GCP1 = -1.0 1) GCPi = 0.18
2) GCP2 = -1.8
3) GCP3 = -2.8
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11
: Page 2, 7/11/18, Job Order #18-21'ker {
All Area Roofing - Haselgrove Residence
Flat Wood Non -Insulated Roof Deck
2207 Barbara Avenue; Fort Pierce, FL:
Design Pressures Based on Vasd:
1) Field P1 = 32.07*[(-1.0) — (0.18)] = -37.8 psf
2) Perimeter P2 = 32.07*[(-1.8) — (0.18)] = -63.5 psf
3) Corners P3 = 32.07*[(-2.8) — (0.18)] = -95.6 psf
Attachment Requirements Per RAS-117:
Based on the requirements of N.O.A. #17-1003.04, pg 23 of 42, System Type E(3), with a
maximum design pressure of-52.5psf, the following are our recommended fastening
patterns to attach the proposed base sheet to the wood (non -insulated) 19/32" or greater
plywood or wood plank deck (attached to structural supports per NOA) utilizing
approved 11 ga. annular ring shank nails and approved tin caps:
Field: 8" o.c. @ 4" laps and 3 staggered rows 8" o.c.
Perimeter: 8" o.c. @ 4" laps and 4 staggered rows 8" o.c.
Corners: 5" o.c. @ 4" laps and 4 staggered rows 5" o.c.
Notes: Corners and perimeter area dimension shall not be less than a = 3'0"
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 2017 Edition.
Wind load calculations based on ASCE-7, 2017 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 inspector to verify compliance
with specifications.
Sincerely,
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Mark A. Wj
Florida En�n
Florida Reg;l
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