In January, FM Global significantly revised its Property Loss
Prevention Data Sheet 1-29, "Roof Deck Securement and Above-Deck
Roof Components." This data sheet is intended to provide FM
Global's recommendations for securement of roof decks to roof
structures and the proper design and installation of above-deck
roof components (insulation, membrane). You need to be aware of the
revisions because they may affect roof system design and limit the
use of some products and systems.
Previous editions of FM 1-29 included a prescriptive option for
increasing attachment of mechanically fastened rigid board
insulation at the roof perimeter and corners where design
wind-uplift pressures are recognized to be greater than in the
field of the roof area.
For example, in the 2003 edition of FM 1-29, roof perimeter
attachment was recommended to be increased 50 percent and roof
corner attachment 75 percent from the roof field attachment pattern
to account for these...
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