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January 28, 2019
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In Case You Missed It: NGA Releases New and Updated Glass Informational Bulletins
NGA has released three updated and one new Glass Informational Bulletins (GIBs) with the help of our member volunteers, they are outlined below:

Understanding Reflected Solar Energy of Glazing Systems in Buildings

The study of light is subjective in some specific aspects, like color and glare, but very objective in aspects like direction and reflection. Basic optics laws tell us that when a light ray travels in a medium and finds a glass surface, for example, part of the incident ray is reflected and the rest is transmitted to the other side of the glass. Depending on glass characteristics and some other factors, the light transmitted exhibits a different range of phenomena such as heat-gain. This document provides education on design considerations to reduce the possible effects of the reflective characteristics of exterior cladding materials and glazing systems used in building construction. This document was published in late 2018.

Heat-Treated Glass Surfaces are Different

As the use of glass increased over recent years, issues of strength, safety and thermal performance became increasingly important design considerations. The availability of tinted and coated glasses had a dramatic impact on glass use in building projects. The vastly expanded aesthetic options, combined with the improved energy conserving and comfort capabilities of tinted and coated glasses allowed architects to use more glass, as well as larger sizes in their designs. A consequence of this trend was a corresponding increase in the use of tempered and heat-strengthened glass in order to meet both thermal and wind load design requirements. The demand for tempered glass further increased with the passing of safety glazing legislation in 1977, which mandated its use in certain locations. This document discusses why industry cleaning procedures must be followed to avoid glass damage. This document was published in April 2008, and updated in 2018.

Skylights and Sloped Glazing are Not Walking Surfaces
The use of skylights and sloped glazing systems continues to grow in popularity as architects and building owners use these fenestration systems to bring natural daylight further into homes, schools, medical facilities, commercial offices and retail stores. In order to ensure human safety and long-term performance of skylights and sloped glazing systems, construction workers, maintenance professionals and others must be aware that the systems typically are not designed or intended to be used as walking surfaces. This document discusses safety concerns with walking on these types of surfaces. This document was published in March 2012, and updated in 2018.

Suggested Procedures for Dealing with Broken Glass

All types of architectural glass can be hazardous when broken. Glass can break after installation due to accidental impact, severe weather events, vandalism or improper glazing conditions as well as for other reasons. Regardless of the type of glass, broken glass can pose a risk of injury and property damage. This document outlines suggested procedures for dealing with broken glass. This document was published in September 2012, and updated in 2018.

The GIBs are available to download at no charge on our partner site, Techstreet.   For members who are visiting Techstreet for the first time, follow these steps:
  • Visit to create your Techstreet account. Enter name and email, and create a password.
  • From there, you will be directed to the homepage featuring technical manuals for purchase, or you can click on the “View Catalog” link to see all available products.
  • For GIBs available at no cost, click on the title, and then click on the orange “Download Free PDF” button to download – it’s that simple.

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