Markings on Tempered Glass

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Author Message Ellis C. Whitby, PE, CSI, AIA, LEED Senior Member Username: ecwhitby Post Number: 398 Registered: 03-2003 Posted on Friday, July 06, 2018 - 10:32 am:    Does Tempered glass have to have visible markings identifying it as tempered? I have been asked since a designer doesn't want to see the marks. Dave Metzger Senior Member Username: davemetzger Post Number: 729 Registered: 07-2001 Posted on Friday, July 06, 2018 - 11:02 am:    IBC 2018 states: 2406.3 Identification of safety glazing. Except as indicated in Section 2406.3.1, each pane of safety glazing installed in hazardous locations shall be identified by a manufacturer’s designation specifying who applied the designation, the manufacturer or installer and the safety glazing standard with which it complies, as well as the information specified in Section 2403.1. The designation shall be acid etched, sand blasted, ceramic fired, laser etched, embossed or of a type that once applied, cannot be removed without being destroyed. A label meeting the requirements of this section shall be permitted in lieu of the manufacturer’s designation. Exceptions: 1. For other than tempered glass, manufacturer’s designations are not required, provided that the building official approves the use of a certificate, affidavit or other evidence confirming compliance with this code. 2. Tempered spandrel glass is permitted to be identified by the manufacturer with a removable paper designation. I don't believe this has changed from IBC 2015. Richard Howard, AIA FCSI CCS LEED-AP Senior Member Username: rick_howard Post Number: 299 Registered: 07-2003 Posted on Friday, July 06, 2018 - 11:16 am:    IBC 2015 and several earlier editions say the same thing. In most cases you should ask that the glazing unit be installed with the marking at the bottom edge, where it is less noticeable. Ellis C. Whitby, PE, CSI, AIA, LEED Senior Member Username: ecwhitby Post Number: 399 Registered: 03-2003 Posted on Friday, July 06, 2018 - 11:36 am:    Dave & Richard: thank you. Michael Chusid, RA FCSI CCS Senior Member Username: michael_chusid Post Number: 403 Registered: 10-2003 Posted on Friday, July 06, 2018 - 06:15 pm:    Your client may not want to see the marks, but a potential buyer might. Without the marks, a buyer must assume the glass is not rated and may have to replace the glass prior to occupancy. Michael Chusid, RA FCSI CCS 1-818-219-4937 www.chusid.com www.buildingproduct.guru Mark Gilligan SE, Senior Member Username: mark_gilligan Post Number: 862 Registered: 10-2007 Posted on Saturday, July 07, 2018 - 12:45 pm:    Without some marking on the glass how does the building official verify that the glass is tempered? Brett Scarfino (Unregistered Guest) Unregistered guest Posted on Monday, July 09, 2018 - 09:09 am:    Ellis: -I know of instances, both residential and commercial, where IGU's needed to be replaced for occupancy permit. Some do look for the ANSI/CPSC identifiers, especially in Florida (which I recall having very thorough glass makeup labeling requirements for NOA). -Some glass fabricators also mark "heat strengthened" plies as well. -laser etched script is cleaner and less conspicuous than silk screened script, IMO. Ronald L. Geren, FCSI Lifetime Member, AIA, CCS, CCCA, CSC, SCIP Senior Member Username: specman Post Number: 1505 Registered: 03-2003 Posted on Monday, July 09, 2018 - 11:26 am:    In the right light, tempered glass can be identified through polarized lenses. Ron Geren, FCSI Lifetime Member, AIA, CCS, CCCA, CSC, SCIP George A. Everding, FCSI, CCS, CCCA, AIA Senior Member Username: geverding Post Number: 878 Registered: 11-2004 Posted on Monday, July 09, 2018 - 06:24 pm:    How did we survive before Google and Youtube? https://www.youtube.com/watch?v=Yb9K3IGXwC0 Michael Chusid, RA FCSI CCS Senior Member Username: michael_chusid Post Number: 405 Registered: 10-2003 Posted on Monday, July 09, 2018 - 06:56 pm:    The video shows a neat trick. But does all tempered glass comply with the requirements to meet the glazing standards? Michael Chusid, RA FCSI CCS 1-818-219-4937 www.chusid.com www.buildingproduct.guru Ronald L. Geren, FCSI Lifetime Member, AIA, CCS, CCCA, CSC, SCIP Senior Member Username: specman Post Number: 1506 Registered: 03-2003 Posted on Monday, July 09, 2018 - 07:27 pm:    Technically, yes. Ron Geren, FCSI Lifetime Member, AIA, CCS, CCCA, CSC, SCIP David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1694 Registered: 03-2002 Posted on Monday, July 09, 2018 - 08:58 pm:    Well if the designer does not like tempered glass markings they must have a fit on stickers indicating breakout glass. Does the designer also raise concerns about fire rating labels on doors and door frames? David G. Axt, CCS, CSI, SCIP Specifications Consultant Axt Consulting LLC Brett Scarfino (Unregistered Guest) Unregistered guest Posted on Tuesday, July 10, 2018 - 10:25 am:    Heat Strengthened glass, which is not safety glazing, can also show strain patterns. Qualitative assessments are not reliable per se. Here is one way stress is measured non-destructively (if the tin side of glass is available in the IGU) - https://www.youtube.com/watch?v=fA6TxKXyzFI George A. Everding, FCSI, CCS, CCCA, AIA Senior Member Username: geverding Post Number: 879 Registered: 11-2004 Posted on Tuesday, July 10, 2018 - 05:34 pm:    I'd trust Brett's youtube method over mine.