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Ask the Expert WebinarSeptember 12, 2006
Untangling the Confusion with FM 1-29
presented by
Mark S. GrahamAssociate Executive Director, Technical Services
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Topics Who is FM Global?
Wind design
Changes in FM 1-29 (January 2006)
Future anticipated changes to FM 1-29
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FM Global
Insurance company: Headquarters in Rhode Island
4,700+ employees/1,500+ engineers
$3.9 billion premiums
$4.4 billion policyholder surplus
A.M Best A+ (Superior)/Fitch AA (Very Strong)
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FM Approvals Property loss prevention-based testing
Third party certification of products andservices
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FM GlobalLoss Prevention Data Sheets (FM 1-29)
FM ApprovalsApprovals (I-60, I-75, I-90, etc.)
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Wind DesignA roof systems resistance capacity
needs to be greater than theanticipated design wind uplift load
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Wind design cont.
Design Wind Load
ASCE 7
IBC Chapter 16
FM 1-28
Wind Resistance
UL 580
UL 1897
FM 4450FM 4470
FM 4474
FM 1-29
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FM 1-28
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Examples of I = 1.15
Buildings that represent a substantial hazard to
human life:--Facilities where 300 or more people congregate
--Daycare centers with capacity > 150
--School facilities with capacity > 250
--College facilities with capacity > 500--Health care facilities capacity > 50
--Jails and detention enters
--Power generating stations
--Water/sewer treatment facilities
--Telecommunications facilities
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FMs design wind load procedure
is conservative.
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Wind Design cont.FM Global Roofing Industry ForumJune 22, 2006
In non-hurricane prone regions, most buildings donot require a I-90 design.
For enclosed buildings less than 90 ft. high in a 90mph or less basic wind speed region, I-60 or I-75designs are appropriate.
Only very tall buildings (typically not steel roofdeck) and buildings in hurricane prone regionsrequire a I-90 design.
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Roof Field, Perimeter and Corners
Wind Design cont.
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Perimeter and CornersFM 1-29 prior to January 2006 revision
Roof field: Design pressure
Perimeter: 50% increase
Corners: 75% increase
*Round up to next whole numberof fasteners
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Revision of Factory Mutuals
Loss Prevention Data Sheet 1-29
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FM Globals rationale
Loss experience in 2004 and 2005 About 70% of all property losses are due to
human factors. Poor roofing-related
workmanship is a recurring concern. About 98% of Hurricane Katrina losses
occurred below design wind speeds.
FM Globals policyholders (mutual) aredemanding improved wind performance.
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Future Changes Being Considered
Clarify I-75/I-90 transition
Clarify where I-90 or greater is applicable
Clarify where prescriptive approach isapplicable
Require FM 1-52 (bubble test) in hurricane-
prone regions
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NRCA is seriously concerned with theimplications of the pending FM 1-52
testing requirement
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Questions
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Additional resources
FM RoofNav: www.roofnav.com FM 1-29 updated, Professional Roofing,
May 2006 FM 1-29 revisited, Professional Roofing,
August 2006 Concerns with field uplift testing,
Professional Roofing, September 2006
Do you overspecify? Professional Roofing,December 2005
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Mark S. GrahamAssociate Executive Director, Technical Services
National Roofing Contractors Association10255 West Higgins Road, Suite 600
Rosemont, IL 60018-5607
(847) 299-9070
1-800-323-9545FAX: (847) 299-1183
E-mail: [email protected] site: www.nrca.net
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Next Ask The Expert WebinarOSHA Inspections:
A Compliance Officers Perspective
November 21, 2006www.nrca.net
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