The American Institute of Steel Construction and the Steel Joist Institute recently released a comprehensive roof design guide addressing rain loads and ponding.
Design Guide 40, Rain Loads and Ponding provides guidance for designing roof systems to avoid or resist water accumulation and any resulting instability. It includes an in-depth review of rain loads and ponding effects to help design professionals properly and efficiently design for ponding on roofs constructed with structural steel, open web steel joists, and joist girders.
It also contains several recommended methods of analysis that can be used to consider the effects of ponding, methods of design accounting for ponding effects, and a presentation of the SJI Roof Bay Analysis Tool, along with design examples that illustrate the concepts discussed.
Design Guide 40 is available for download at aisc.org/dg.
Related Stories
| Mar 26, 2014
Better Buildings Initiative leading to tens of millions of dollars in savings annually, says DOE
Facilities across the nation have been able to shave on average about 2.5% of their annual utility costs through efficiency initiatives spurred by the federal Better Buildings Initiative, according to the Department of Energy’s Maria Vargas.
| Mar 26, 2014
Free transit for everyone! Then again, maybe not
An interesting experiment is taking place in Tallinn, the capital of Estonia, where, for the last year or so, its 430,000 residents have been able to ride the city’s transit lines practically for free. City officials hope to pump up ridership by 20%, cut carbon emissions, and give low-income Tallinnites greater access to job opportunities. But is it working?
| Mar 19, 2014
Green building standards can help building become more storm-resistant
Structures built to green standards have added resilience to destructive storms because green buildings are often constructed with stronger, more sustainable materials than traditional buildings.
| Mar 19, 2014
Santa Monica, Calif., may offer LEED alternatives to help promote green construction
With developers in Santa Monica, Calif., looking for ways to build green more inexpensively, the city may consider alternatives to LEED such as Green Globes.
| Mar 13, 2014
USGBC hits back at Environmental Policy Alliance criticism
The Washington, D.C.-based Environmental Policy Alliance has launched a campaign to make the claim that LEED-certified buildings are less energy efficient than other buildings. In response, USGBC told its members: "Don’t be fooled, the Environmental Policy Alliance isn’t the 'EPA' you might think."
| Mar 5, 2014
Southern Forest Products Assn. revamps pressure-treated pine specifications
It provides information to assist with the proper specification and use of pressure-treated Southern Pine materials.
| Mar 5, 2014
UL, PRI Construction Materials Technologies reach product certification agreement
Underwriters Laboratories (UL) Inc. reached an agreement with PRI Construction Materials Technologies LLC (PRI) through which PRI will participate in UL's "Data Acceptance Program," enabling the acceptance of data generated at PRI toward UL product certification.
| Feb 28, 2014
GBI issues guide to help federal agencies meet sustainability mandates
The Green Building Initiative has released “The Guiding Principles Compliance for New Construction,” for federal buildings to help federal agencies meet sustainability mandates in the construction of new buildings.
| Feb 28, 2014
Steel Joist Institute standards open for review
The 2015 draft of the Steel Joist Institute’s “Single Joist Standard Specification for K-, LH-, and DLH-Series and Joist Girders” will be available for public review until May 31, 2014.
| Feb 19, 2014
Net Positive Energy + Water is latest green certification standard
The advancement of sustainable construction has reached a new milestone with the development of Net Positive Energy+Water, a new green building certification standard that aims to improve net zero approaches to energy and water conservation.