fm 29 seminar notes

8/3/2019 FM 29 Seminar Notes

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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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