Design Considerations for Multiple-Cavity IG Units

The purpose of this document is to guide the design, fabrication, and use of multiple-cavity Insulating Glass (IG) within the fenestration industry. As such, this document 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 have been developed from the collective experiences of insulating glass manufacturers, glass and glazing material suppliers, design engineers, industry consultants and persons experienced in successful IG manufacturing. By this nature, they reflect existing technology and are subject to periodic review and change.


IGMA is the trade association representing the interests of the Insulating Glass industry not only in North America but worldwide. Our focus is on developing and advancing new technologies in the manufacture of insulating glass units through development of codes and standards, topic industry publications, education, product certification and leading edge research.