IGMA Visual Quality Working Group Sends Guideline
Back to Task Group
|Members of the IGMA Technical Services Committee
were joined this morning by members of the AAMA Glass Materials
Council for a joint meeting.
The Insulating Glass Manufacturers Alliance (IGMA) summer meeting,
taking place at the Hyatt Regency in Huntington Beach, Calif., concluded
yesterday with the visual quality working group's decision to return
its visual quality guidelines back to the task group for revision.
The main point of discussion was concern that a single set of visual
quality guidelines would not address the unique differences of large
commercial insulating glass (IG) units versus residential IG units.
The group discussed the existence of differences between the defect
sizes and inspection processes for commercial and residential IG
units. There was concern that the current guideline addresses point
blemishes, but does not address the inspection process for linear
blemishes. While the working group did not find the argument for
two separate documents persuasive enough to turn the current guideline
into a residential-only document, group members did vote in favor
of a motion to revise the document to differentiate and address
the differences that exist between the residential and commercial
Another point of discussion for the visual quality working group
was the handling and definition of optical interferences that do
not constitute visual obstructions. The group agreed to move the
definitions for Brewster's Fringes, Newton's Rings and quench marks
beneath a general definition for Optical Effects. This, the group
agreed, would clarify to readers that these issues are not addressed
by the guideline because they are not considered visual obstructions.
Fogging, which is a visual obstruction, was also discussed. There
was concern that a brief statement that fogging is not allowed could
permit the document's end-users to insist on the replacement of
fogged units even after the manufacturer's warranty has expired.
The statement was altered to read, "Fogging: not allowed. Consult
with manufacturer." The group agreed that since the document
is only a guideline it can't be used by an end-user to insist that
a unit is replaced, it only indicates that fogging is a visual obstruction;
how to deal with fogging is then left to the manufacturer.
The summer meeting continued today with IGMA's technical services
committee and education and certification meeting. The IGMA summer
meeting concludes Wednesday, June 13.