Basic Wind Uplift Design, Factory Mutual and Alternative Criteria

© Ron Blank & Associates, Inc. 2009
Please note: you will need to complete the conclusion
quiz online at ronblank.com to receive credit
Basic Wind Uplift Design,
Factory Mutual and Alternative
Criteria
Basic Wind Uplift Design,
Factory Mutual and Alternative Criteria
An AIA Continuing Education Program
Credit for this course is 1 AIA HSW CE Hour
U.S. Ply, Inc.
P.O. Box 11740
Fort Worth, TX 76110
(866) 787-4759
joel.king@usply.com
www.usplycoolroofs.com
Course Number
usp07a
An American Institute of Architects (AIA)
Continuing Education Program
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of Completion are available for all participants upon
completion of the course conclusion quiz with +80%.
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An American Institute of Architects (AIA)
Continuing Education Program
Course Format: This is a structured, web-based, self study course
with a final exam.
Course Credit: 1 AIA Health Safety & Welfare (HSW) CE Hour
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Please note: you will need to complete the conclusion quiz
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Course Description
Learning Objectives
UNDERSTANDING WIND LOADS ON ROOFS
Q: What is wind uplift?
UNDERSTANDING WIND LOADS ON ROOFS
Wind Patterns on High Rise Buildings
UNDERSTANDING WIND LOADS ON ROOFS
Typical Vortex Patterns on Rooftop Wind
Approaching at Corner
UNDERSTANDING WIND LOADS ON ROOFS
Uplift Pressure at an Instant in Time -1
UNDERSTANDING WIND LOADS ON ROOFS
Uplift Pressure at an Instance in Time - 2
UNDERSTANDING WIND LOADS ON ROOFS
Wind Uplift
UNDERSTANDING WIND LOADS ON ROOFS
Wind Uplift
UNDERSTANDING WIND LOADS ON ROOFS
Q: What accounts for most roof blow offs?
UNDERSTANDING WIND LOADS ON ROOFS
Most Vulnerable Areas
UNDERSTANDING WIND LOADS ON ROOFS
Roof Divisions on Structures <60 ft. in Ht.
UNDERSTANDING WIND LOADS ON ROOFS
Roof Divisions on Structures > 60 ft. in Ht.
UNDERSTANDING WIND LOADS ON ROOFS
Roof Divisions on Structures > 3’ Parapet
UNDERSTANDING WIND LOADS ON ROOFS
How are Uplift Pressures Determined?
UNDERSTANDING WIND LOADS ON ROOFS
How are Uplift Pressures Determined?
UNDERSTANDING WIND LOADS ON ROOFS
How are Uplift Pressures Determined?
UNDERSTANDING WIND LOADS ON ROOFS
Results
UNDERSTANDING WIND LOADS ON ROOFS
Simplified Calculators
UNDERSTANDING WIND LOADS ON ROOFS
Simplified Calculators
FM Roof Nav. Calculator
Building Dimensions
Terrain/Building Properties
Ratings
Length:
Ground Roughness:
Exterior Fire:
Width:
Wind Speed:
Internal Fire:
Height:
Wind Borne Debris:
Hail:
Roof Slope:
Building Partially Enclosed:
Wind Uplift*:
Provide building dimensions and terrain/building properties and the online
calculator will tabulate the wind uplift in the lower right column
Displayed Calculations
Building Dimensions
Terrain/Building Properties
Ratings
Length: 200 ft (60.96 m)
Ground Roughness: C
Exterior Fire:
Width: 100 ft (30.48 m)
Wind Speed: 110
Internal Fire:
Height: 24 ft (7.31 m)
Wind Borne Debris: Yes
Hail:
Roof Slope: 0.25 in 12 (2.08 %)
Building Partially Enclosed: No
Wind Uplift*: 90 psf
Here is the calculation displayed once the data has been entered.
The wind uplift includes a safety factor of two by doubling the actual design
pressure. This means that the roof system (for field zone) should be tested to
withstand 90 psf force even though the anticipated maximum actual pressure
should not exceed 45 psf.
Higher pressures are then correlated for perimeters and corner zones from FM
LPDS 1-28 and/or 1-29 tables.
FM 1-28 Table 8 Ref
FM 1-28 Table 8A Ref
UNDERSTANDING WIND LOADS ON ROOFS
Basic Wind Uplift Recap
FACTORY MUTUAL AND CODE COMPLIANCE
What is Factory Mutual?
FACTORY MUTUAL AND CODE COMPLIANCE
Why is Factory Mutual Important?
FACTORY MUTUAL AND CODE COMPLIANCE
How FM Relates to Code
FACTORY MUTUAL AND CODE COMPLIANCE
Code Compliance
FACTORY MUTUAL AND CODE COMPLIANCE
Code Compliance
One or more International Codes®
currently enforced statewide
FACTORY MUTUAL AND CODE COMPLIANCE
Code Compliance
FACTORY MUTUAL AND CODE COMPLIANCE
Code Compliance
FACTORY MUTUAL AND CODE COMPLIANCE
Code Compliance
FACTORY MUTUAL AND CODE COMPLIANCE
Basics of FM Approved Roof
FACTORY MUTUAL AND CODE COMPLIANCE
Basics of FM Approved Roof
How is this Different from the Past?
(Insulation Sacrament)
Before the Change
New FM
Requirements
1- 50%
60 increase
75%
increase
160
50%
increase,
min. 1 per
2 s.f.
100%
increase,
min. 1 per
1 s.f.
1- 50%
75 increase
75%
increase
175
50%
increase,
min. 1 per
2 s.f.
100%
increase,
min. 1 per
1 s.f.
1- 50%
90 increase
75%
increase
190
1-150
Approved
Assembly
1-225
Approved
Assembly
How is this Different from the Past?
(Single Ply/Base Sheet Securement)
Before the Change
New FM
Requirements
1- 70%
60 increase
160%
increase
160
Distance
between
rows is
reduced by
.60%
Distance
between
rows is
reduced by
.40%
1- 70%
75 increase
160%
increase
175
Distance
between
rows is
reduced by
.60%
Distance
between
rows is
reduced by
.40%
1- 70%
90 increase
160%
increase
190
Distance
Distance
between
between
rows is
rows is
reduced by reduced by
.60%
.40% or
.60% in
both
directions
FM 1-29: Aug 2007 Prescription
FM 1-29: Aug 2007 Prescription
FM 1-29: Aug 2007 Prescription
FM 1-29: 2007 – Adhesive Prescription
FM 1-29: Aug 2007 Prescription
FM 1-29: Aug 2007 Prescription
Fig 7 from FM 1-29 for
Mechanically Attached Singly Ply
Wind Speed Map – United States
Wind contours
are expressed in
MPH and
represent the
highest 3-sec
gust at 33 ft
above ground.
3 Second Gust Vs. Sustained
Texas Coast Line
Louisiana Coast Line
Florida Coast Line
Mid Atlantic Coast Line
Upper East Coast
West Coast Line
Addressing FM 1-60 and FM 1-75
RATING
FIELD
1-60 & 1-75,
with fastened
insulation
Varies per Mfg.
(Typ) Max
density 1 per 4
SF or denser.
PERIMETE
R
CORNER
50% increase, 100%
increase,
min. 1 per 2
min. 1 per 1
SF
SF
1-60 & 1-75, See max
MA-Single Ply spacing of
mfg
Distance
between rows
is reduced by
.60%
Distance
between rows
is reduced by
.40%
1-60 & 1-75,
MA-Base
Sheet
Distance
between rows
is reduced by
.60%
Distance
between rows
is reduced by
.40%
See max
spacing of
mfg
Addressing FM 1-90
RATING
FIELD
PERIMETER
CORNER
1-90 APPROVAL
Manufacturer specific
assembly rated for 1-90
or higher
FM Approved Assembly
rated for FM 1-150 or
higher, (mfg specific)
FM Approved Assembly
rated for FM 1-225 or
higher, (mfg specific)
1-90, with fastened
insulation (BUR/Mod
Bit)
Varies per Mfg. (Typ)
Max density 1 per 4 SF
or denser.
1.5” ISO – loose laid +
0.5” Glass Gyp
Fastened with #14 @ 1
per 1.33 SF
1.5” ISO – loose laid +
0.5” Glass Gyp
Fastened with #14 @ 1
per 1 SF
1-90, MA-Single Ply
See max spacing of mfg
Distance between rows
is reduced by .60%
Distance between rows
is reduced by .40% or
.60% in both directions
1-90, MA-Base Sheet
See max spacing of mfg
Distance between rows
is reduced by .60%
Distance between rows
is reduced by .40% or
.60% in both directions
Importance of Fastener Placement
Review of FM 1-29, FM 1-90
Prescription Option 1
Review of FM 1-29, FM 1-90
Prescription Option 2
Review of FM 1-29 Prescription for
MA Single Ply or Base Sheet
FM 1-52 “Field Uplift Test”
Required on FM Insured buildings in hurricane prone
zones as field verification of intended uplift resistance.
Example of Non- FM Spec
Bldg Ht Above
Grade
Field
Perimeters
Corners
Up to 15 ft
35 psf
60 psf
89 psf
16 ft to 30 ft
41 psf
69 psf
104 psf
30 ft to 40 ft
47 psf
79 psf
119 psf
Alternative Uplift Criteria
Translation of Non-FM Spec
Bldg Ht Above
Grade
Field
(max design)
Perimeters
(max design)
Corners
(max design)
Up to 15 ft
35 psf,
(1-75)
60 psf,
(1-120)
89 psf,
(1-180)
16 ft to 30 ft
41 psf,
(1-90)
69 psf,
(1-150)
104 psf
(1-210)
30 ft to 40 ft
47 psf,
(1-105)
79 psf,
(1-165)
119 psf,
(1-240)
Alternative Uplift Criteria
Course Summary
© Ron Blank & Associates, Inc. 2009
Please note: you will need to complete the conclusion
quiz online at ronblank.com to receive credit
Basic Wind Uplift Design,
Factory Mutual and Alternative
Criteria
Basic Wind Uplift Design,
Factory Mutual and Alternative Criteria
An AIA Continuing Education Program
Credit for this course is 1 AIA HSW CE Hour
U.S. Ply, Inc.
P.O. Box 11740
Fort Worth, TX 76110
(866) 787-4759
joel.king@usply.com
www.usplycoolroofs.com
Course Number
usp07a