July 2003

Detailing ASCE 7's changes

Detailing ASCE 7's changes 4 stars4 stars4 stars4 stars4 stars

Updated ways to determine design wind loads

by Thomas L. Smith, AIA, RRC
Be the first to comment

Within the past few years, ASCE 7, "Minimum Design Loads for Buildings and Other Structures," published by the American Society of Civil Engineers, increasingly has been used to determine design wind loads, particularly because it is referenced in the 2000 edition of the International Building Code (IBC). Recently, ASCE 7's 2002 edition became available; it is referenced in IBC's 2003 edition. Because many jurisdictions soon may begin requiring compliance with IBC 2003, it is important you are aware of the changes in ASCE 7.

ASCE 7's new edition includes several changes and additions that apply to the calculation of roof assemblies' wind loads. Unfortunately, the changes are not delineated in the document, and it is a laborious process to determine what changes were made. I tracked the changes, and following is an overview of those pertaining to calculating roof assemblies' wind loads. (Note: Additions and changes pertaining to primary structural elements, such as beams, columns, shear walls and diaphragms that provide support and stability for the building, are not addressed in this article.)

Parapets is a new section pertaining to parapet loads. This section directly applies to loads on parapet base flashings, which previously were not addressed in ASCE 7. When determining base flashing loads, the suction pressure on the windward parapet's roof side is determined by using the same coefficient used for the...

To read the article in its entirety, please log in or register (registration is free).

Log in or register for FREE access to this article and other Professional Roofing online content.

Not a professionalroofing.net user?

Register now for free access
  • Full access to every article
  • Online Web exclusive information
  • Photo gallery
  • Breaking news
  • Online classified ads

Already a professionalroofing.net user?

Log in now

User name:



Login help
Click here to have your user name and password emailed to you.

Comments (0) Login to post a comment or rating
There are no comments posted.