The Fabricating Committee discusses a variety of industry documents covering topics such as point-supported glass, thermal stress and more.

Fabricating Committee meetings began this morning at the 2019 Fall Conference with discussion and updates focused on a number of topics and activities the group has been working on. Among these efforts has been updating a Glass Information Bulletin on point-supported glass. Melissa Szotkowski with Oldcastle BuildingEnvelope® said the document has been balloted and is now being formatted for publication.

The original document was published in 2005 and revised in 2012. Szotkowski said there has been industry demand for these guidelines. While there are efforts to create a Standard within ASTM, she explained the committee wanted to create an actual industry guideline rather than waiting on ASTM to develop a standard.

The new document provides conservative allowable stresses for heat-strengthened and fully tempered glass. It also makes recommendations regarding holes in glass and allowed for a testing option, among other updates.

It is expected to be available by next week.

There were also discussions about thermal stress in spandrel. A document has been published to provide a better understanding of spandrel glass construction and the resulting consequences related to thermal stress.

The revised Heavy Glass Door Design Guide, which had been in the works for many years, will be published by the end of this year. It was originally published in 1997 and covers door types, hardware, etc., as well as technical content and includes new graphics. The document will go to the task group once more for review, and one more round of balloting, with the goal to have it for sale by the end of year.

In addition, the updated Engineering Standards Manual is now published and available on the website.

Edge grinding post tempering continued to be a discussion topic. This is a concern for some in the industry since doing this after tempering can change the stress in the glass and reduce the strength of glass. A task group was formed that will look into the development of a test protocol that will help fabricators better understand the strength of the glass by evaluating post finishing of heat treated glass.

In addition, a task group was also formed to review the current document on methods for measuring distortion. The group will review the existing document and address comments that have come in to make sure it’s updated.

As far as additional efforts, the group also discussed the possibility of developing a guideline for shower enclosures. One attendee mentioned there’s currently no guidance in the industry for how these should be supported and installed and that many of these are not well designed or engineered.

“People are out there buying glass from a fabricator and they have no idea how to install it …” he said.

Since this is a topic that will also involve the Installing Committee, the Fabricating Committee will seek out an opportunity to work with the Installing Committee and potentially develop a heavy glass shower design guide.

Over the past few years anisotropy has become a big discussion topic in the glass industry. In response to that interest, today also included a presentation that looked at different anisotropy equipment technologies. Panelists included Rainer Feuster with Viprotron; Nate Huffman with SoftSolution; and Jakub Kowalcsyk with LiteSentry. Each discussed the features and benefits of the various types of equipment that they offer.

ASTM is also currently developing a test method for measuring anisotropy.

The Fall Conference continues through Thursday in Toledo. Stay tuned to USGNN™ for more news and reports as they are made available.