Volume 8, Issue 10 - November 2007
WDMA Opens Up
The second edition of AAMA/ WDMA/CSA 101/I.S.2/A440-08 Standard/Specification for Windows, Doors and Unit Skylights has been completed with an anticipated publication date of early 2008. This consensus-based publication is jointly developed by the Window and Door Manufacturers Association (WDMA), the American Architectural Manufacturers Association (AAMA) and the Canadian Standards Association (CSA).
This voluntary standard/specification is material neutral and establishes the levels of performance for exterior doors, windows and unit skylights. The two fundamental applications are product performance comparison and code compliance. Fenestration categories include single and dual windows, single and dual side-hinged door systems, sliding doors, unit skylights and tubular daylighting devices (TDDs) for new construction and replacement applications. The document is an updated version of previous standards referenced in the building codes and remains a principal document for the third-party Hallmark Certification Program used by manufacturers, architects, builders, engineers, code officials and government agencies.
This edition contains the following significant changes and has been structured to promote clarity and ease of use for testing and rating designations.
Reduction of the number of window and door Performance Classes from five to four by elimination of Class C. The reduction of the number of Performance Classes from five to four was accomplished by the elimination of Performance Class HC. Along with that change, Performance Class C has been renamed Performance Class CW. The major difference is that Performance Class CW now has an L/175 deflection limitation requirement. To meet the requirements of the new standard, products that were tested previously to the Performance Class HC will qualify automatically for the new Performance Class CW. Products that were tested previously to Performance Class C will also qualify for the new Performance Class LC requirements.
To qualify a Performance Class LC to Performance Class CW, products must now be tested for the L/175 deflection limit requirements.
What the Designations Mean
Other noteworthy changes include:
This voluntary Standard represents the continuing development of an internationally accepted performance Standard/Specification for inclusion in the U.S. International Building Codes and in the National Building Code of Canada.
AAMA/WDMA/SA 101/1.S.2/A440-08 Standard/Specification Requirements
It is important to note that product selection is always based on performance requirements of the particular project and not solely these suggestions specified in Items (a) to (d). The performance class ratings should be regarded as an indication of the level of performance, with the least stringent requirements established for the R performance class, and the most stringent for the AW performance class.
The following descriptions can be used as a general guide in helping to determine which class is suited for a particular
Patty Elliott serves as manager, communications and public relations, for the WDMA. Ms. Elliott’s opinions are solely her own and do not necessarily reflect those of this magazine.