In September, FM Global issued another revision to its Loss
Prevention Data Sheet 1-29, "Roof Deck Securement and Above-Deck
Roof Components." This latest revision, which is actually dated
August 2007, follows other revisions that took place in February,
May 2006 and January 2006.
If you are involved in roof assembly design and installation
where FM Global's guidelines apply, I encourage you to be familiar
with the latest revisions to FM 1-29.
FM Global has returned to allowing its prescriptive perimeter
and corner fastener enhancements for Class 1-90 but only in limited
situations. Since the January 2006 revision, prescriptive perimeter
and corner fastener enhancements only have been permitted by FM
Global up to Class 1-75. With the latest revision, for buildings
located in non-hurricane-prone regions, prescriptive enhancements
are permitted in areas where the roof rating's recommended field
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