HomeMy WebLinkAboutEngineer letter, Revised - Wind Calcs Sloped Roof
DATE: October 30, 2020 Order No.: 20R958
CLIENT: Triune Builders, Inc.
ADDRESS: PO Box 631; Hobe Sound, FL 33475
PROJECT: Turtle Reef Tiki Hut
ADDRESS: 10800 SE Ocean Blvd.; Jensen Beach, FL
ASCE 7-10 DESIGN PRESSURE CALCULATIONS
In Accordance with Chapter 30, Part I
Project Information: Standing Seam over Sloped Wood Deck
Height = 10' Exposure: D Ultimate Windspeed: Vult= 170 mph
Length = 24' Category: II Basic Windspeed: Vasd = 132 mph
Width = 15' Slope: 8:12 Kz = 1.03
Design Calculations:
Velocity Pressure: q = 0.00256*[(1.03)(1.0)(1.0)(132)2]
= 45.9 psf
Width of Pressure Coefficient: 0.1(15') = 1.5'
0.4(10') = 4.0' } use: 3.0'
Effective Wind Area: <10ft2
For parapet height three feet (3') or larger, zone three (3) can be treated as zone two (2) (ASCE7-05).
External Pressure Coefficient: Internal Pressure Coefficient
1) GCP1 = -1.0 1) GCPi = 0.18
2) GCP2 = -1.2
3) GCP3 = -1.2
Design Pressures:
1) Field : P1 = 45.9*(-1.0 – 0.18) = -54.2 psf
2) Perimeter : P2 = 45.9*(-1.2 – 0.18) = -63.4 psf
3) Corners : P3 = 45.9*(-1.2 – 0.18) = -63.4 psf
Page 2
10/30/20
Turtle Reef Tiki Hut
10800 SE Ocean Blvd.
Jensen Beach, FL
Attachment Requirements:
Based on FLPA# 27499.2; the following are our recommended fastening patterns for the DM Class 1000
0.032" Aluminum 1" Nailstrip 16" Wide Roof Panels:
Field: Maximum of 6" o./c. clip spacing (Table – Page 2)
Perimeter: Maximum of 6" o./c. clip spacing (Table – Page 2)
Corners: Maximum of 6" o./c. clip spacing (Table – Page 2)
Based on NOA# 18-0523.02; System E(1) page 3 of 4, the following are our recommended underlayment
fastening requirements:
Zone 1 Field: 6" o.c. @ laps and 2 staggered rows 12" o.c.
Zone 2 Perimeter: 6" o.c. @ laps and 3 staggered rows 12" o.c.
Zone 3 Corners: 6" o.c. @ laps and 3 staggered rows 12" o.c.
Notes: Corners and perimeter area dimension shall not be less than a = 3.0'
All work shall be in compliance with the local building code product control notice of
acceptance and manufacturer specifications and Florida Building Code 2017.
Wind load calculations based on ASCE 7-10 and information provided by client.
All work shall be inspected by our field engineer or city inspector to verify compliance
with specifications.