Discussing glazing guidelines, gas permeability and thermal stress at IGMA conference

Katy Devlin, Glass Magazine
March 25, 2010
COMMERCIAL, FABRICATION : MEETINGS AND EVENTS

A week of glass industry conferences kicked off March 23 at the Paris Las Vegas with the start of the Insulating Glass Manufacturers Alliance, Ottawa, Ontario, Annual Conference. The IGMA conference runs through March 26, coinciding with the Topeka, Kan.-based Glass Association of North America’s Glass Week meeting, running March 25-30, and BEC Conference, March 27-29. Visit GlassMagazine.com for daily event coverage.

The IGMA Annual conference, with 82 registered attendees as of March 15, began March 23 with a daylong board of directors’ meeting, followed by a day of committee meetings March 24. Below are highlights from the committee meetings.

  • The Gas Permeability working group discussed the progress of the evaluation of gas permeability of edge seal assemblies, Phase 2 of the gas permeability research project. Phase 1 was the evaluation of the permeability of sheet materials. The objective of the research project is to create a testing program to measure how well units retain gas-fill throughout a series of weatherization tests. The testing will provide information about the normal range of gas reduction, allowing manufacturers to provide customers with documentation for gas fill over time. Phase 2 involves the development of the test cell configuration that will allow testing of gas permeability of a section of an IG unit edge. Elie Alkhoury, president and CEO, CAN-BEST, Canadian Building Envelope Science and Technology, Brampton, Ontario, said the test method has been solidified. However, CAN BEST is having trouble developing a consistent baseline for testing. 
     
  • The Glazing Guidelines working group discussed reported problems with the setting block heights in some IG window systems. The current 3-millimeter minimum clearance for certain sized units can lead to trapped water in the glazing channel, according to industry representatives who have contacted the IGMA office. The committee decided to amend the current TM3000 glazing guidelines document to add language identifying the possibility of seal failure if setting blocks are too low. 
     
  • Bill Lingnell, president, Lingnell Consulating Services, Rockwall, Texas, and technical consultant to IGMA, provided an update on the ASTM E 2431, a standard to reduce thermal stress breakage, during the Thermal Stress meeting. Progress has slowed as funding has decreased, due to the slow construction economy, he said. “We’ll get into it again as soon as the economy changes in our industry,” he said. 
     
  • Work continued on the Thermal Stress Bulletin and the Design Considerations for Multi-Airspace IGUs document. The Thermal Stress Bulletin will provide guidelines on avoiding problems that can create thermal stress. The Design Considerations for Multi-Airspace IGUs document is in its early stages and will be formatted similarly to IGMA’s Visual Quality guidelines. The document will address how factors such as coatings should be considered when designing a multi-airspace IGU.