Volume 48, Issue 6- June 2013


Anticipating the Industry’s Needs
IGMA Moves Forward with Technical Publications
by Margaret Webb

At the most recent Insulating Glass Manufacturers Alliance (IGMA) meeting held in New Orleans, La., a number of much-needed technical publications for the fenestration industry were approved. These included:

TM-1300-13, Design Considerations for Multiple Cavity Insulating Glass Units: The purpose of this document is to guide the design, fabrication and use of multiple-cavity insulating glass (IG) within the fenestration industry. It is not intended to duplicate pre-existing guidelines for single-cavity IG. Rather, it is meant to expand upon those guidelines where requirements for multiple-cavity IG differ from those of single cavity IG. These guidelines are applicable for the evaluation of the manufacturing processes of sealed insulating glass units and quality requirements.

TB-1500-13, Guidelines to Reduce Instances of Thermal Stress: This technical bulletin provides guidelines relating to thermal stress considerations for window glass products used in commercial and residential building envelope projects. Its purpose is to give the user specific guidelines and design assistance toward avoiding glass problems that arise from breakage caused by thermal stress conditions. The technical bulletin is intended to consider, but not be limited to, conditions known to be important to thermal stress in glass, a knowledge base of reference materials, available industry information, do’s and don’ts guidelines for thermal stress and practical design considerations for the review and analysis of thermal stress. Conditions addressed in this publication are altitude, building design, design winter conditions, elevation (orientation), glass-edge conditions, post-installation films, risk conditions associated with framing considerations, glass kind and type, heat traps (indoor conditions), number of glazing lites, solar radiation, spandrel and on-site storage conditions.

IGMA has agreed to provide the majority of the funding required to create the models for the development of an ASTM standard for the thermal stress for IGU’s. Total funding required to develop the standard is $75,000. This project has been on hold for the past three years. Previous solicitations to the industry for funding have been unsuccessful due to the economic hardships that the industry has endured. IGMA will be contacting other organizations to determine if there is interest in participating.

Both the documents should be available this fall.

TB-1700-13, Language of Sealed Insulating Glass Units: This document covers current terminology used by the industry in the design, development and manufacture of insulating glass units.

IGMA does not rest on our past accomplishments but continuously looks for new technologies and processes to improve the performance durability of insulating glass products. All IGMA standards are developed by leading-edge research and technology. Research projects are governed by the Emerging Technology and Innovation Committee, which has four active task groups:

Gas Permeability – currently the task group is reviewing the draft RFP for Phase 2, which encompasses a modification of the EN 1279 standard.

NREL Advanced Testing Fenestration Task Group is seeking to develop a “big hammer” test, which would result in faster test times as well as developing a new standard specification to test the gas content of IGUs, which use exotic gases such as krypton and xenon.

The Vacuum Insulating Glazing Task Group is working on a white paper on VIG. Draft text was reviewed at the conference and this first complete draft of the document is close to completion.

The Life Cycle Assessment Task Group was provided an opportunity to review draft nine of the Product Category Rule for Fenestration Products. The completion of the document has been delayed due to complications with the use phase, specifically thermal performance of the fenestration system. This task group will be undertaking the development of a Product Category Rule for IGUs and their components (spacers, sealants and desiccants).

The Certification and Education Committee, specifically the Spacer and Integrated Spacer Systems Task Group, is looking at alternate ways to determine component equivalency. Currently the task group is reviewing performance attributes as the determination for equivalency rather than the spacer-bonding surface, which is currently used.

Registration is now open for the IGMA 2013 Summer Conference, held August 7-10, 2013, at the Marriott Harbourfront Hotel in Halifax, Nova Scotia and will focus on certification and testing, specifically in-house testing methodologies that manufacturers can use in their own plant.

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