ASCE 7-16

Increased design wind-uplift loads may present challenges


In June 2017, the American Society of Civil Engineers (ASCE) published an updated edition of ASCE 7, "Minimum Design Loads and Associated Criteria for Buildings and Other Structures," (ASCE 7-16). Because ASCE 7-16 is referenced in the International Building Code,® 2018 Edition (IBC 2018) as the basis for design wind-uplift load determination for all roof assembly types except asphalt shingles and tile, you should be aware of the changes.

ASCE 7-16

ASCE 7-16's design wind-uplift load procedures are described and the basic design wind speed maps are provided in Chapter 26-Wind Loads: General Requirements. Design wind-uplift loads for roof assemblies typically are determined using ASCE 7-16's Chapter 30-Wind Loads: Components and Cladding.

Chapter 30 provides seven methods—referred to as "Parts"—for wind load determination. Part 1 applies to low-rise, enclosed or partially enclosed buildings. Part 2 is a simplified approach applicable to low-rise, enclosed buildings. Part 3 applies to enclosed or partially enclosed buildings higher than 60 feet. Part 4 is a simplified approach applicable to enclosed buildings higher than 60 feet but less than 160 feet in height. Part 5 applies to open buildings of all heights. Part 6 applies to building appurtenances, such as roof overhangs, parapets and rooftop equipment. And Part 7 applies to nonbuilding structures, including rooftop solar panels.