Members of the Insulating Glass Manufacturers Alliance (IGMA) presented at the recent American Architectural Manufacturers Association (AAMA) Fall Conference on the effect hurricanes have on insulating glass (IG) unit performance, as well as how to wash and cut glass and how to conduct a frost point test.

IGMA technical consultant Bill Lingnell led the presentation reviewing impact factors, including the effects of window pressure, water and moisture in the glazing system, windblown debris and structural damage, barometric pressure and/or temperature changes.

“Hurricanes can have a significant impact on the long-term performance of insulating glass units, even those that are not broken by wind-borne debris,” said Lingnell.

Lingnell advised that when designing IG units, water exits and possible changes in barometric pressure that cause stress on the edge seals and stresses in the glass should be kept in mind.

IGMA Insulating Glass Fabricators Hands-On Workshop experts displayed two stations, one demonstrating glass washing and cutting, and the other showing how to conduct a frost point test.

Bill Briese led eight participants in each session on cutting and washing showing that 91 isopropyl alcohol is a more effective cleaner than typical glass cleaner.

“You need to make sure it’s actually clean,” said Briese. “Oils, fingerprints and detergents bring more sodiums, which can lead to dirty glass or stains on glass.”

With glass cutting, volunteers used water and four different angle cutting wheels. Briese said the four factors that go into cutting glass successfully include the angle of cutting wheel, speed, diameter and force applied.

Lingnell and Randi Ernst led a second workshop on conducting a frost point test on glass. Frost point, or lack of humidity in the glass cavity, is critical for the longevity of a sealed unit both installed and submitted for IGMA certification.