MIL-HDBK-1001/5A
12.4 Dead Load. The additional dead load of 10 to 25 psf for gravel ballast or pavers is readily accommodated in new construction. But reroofing of existing buildings obviously requires a check of the original structural design to determine if the structural framing has excess capacity over its original design load. Inspection of the roof's structural components to assure its sound condition is also recommended. Additional ballast load required at the roof perimeter may sometimes be averted by a combination anchored/ballasted system, described in Factory Mutual Data Sheet 1-29 Technical Advisory Bulletin,
Loose-laid Ballasted Roof Coverings.
12.5 Mechanical Fasteners. For manufacturers' approved mechanical fasteners and fastener patterns, refer to the latest edition of the Factory Mutual Approval Guide.
12.6 Design Data. For design guidance on wind-uplift pressures for various U.S. locations, wind-design procedures, and other details, consult Factory Mutual Publications. For design guidance for locations outside the U.S., refer to
MIL-HDBK-1002/2, Structural Engineering - Loads.
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