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What’s the Difference Between U-Value and R-Value?

One of the most important glass performance measures is U-value—also known as U-factor—which measures the insulating characteristics of the glass, or how much heat flow or heat loss occurs through the glass due to the difference between indoor and outdoor temperatures.

 
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Specifying Heat-Rated Glass

Glass is vital to the aesthetic of nearly every modern structure—increasing natural light, curbing sound, protecting against inclement weather and offering a view to the external world. While glass has always been favored for its aesthetic versatility, it has quietly and reliably evolved into a critical component that can add beauty, structural integrity and fire protection to rooms and buildings, as well.

 
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The Science of Low-E Coatings

As one of the most popular and versatile building materials used today, low-e emissivity (low-e) glass coatings can enable exceptional energy efficiency and aesthetics. But how do they work?

 
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Why Specify Which Type of Glass?

Choosing the right architectural glass is crucial to a successful project. For more informed decisions in the evaluation, selection and specification of architectural glass, Vitro Architectural Glass (formerly PPG glass) recommends becoming familiar with the properties and benefits of the four most common glass types: low-e coated glass, clear glass, low-iron glass and tinted glass.

 
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"Spec Check”: Accuracy Key to Compliant Specifications, Successful Projects

Imagination and creativity are critical skills that enable architects to create beautiful, vibrant and sustainable buildings. However, one aspect of successful projects that often goes under the radar is the glass specification. From project conception to completion, specifications provide a necessary “check and balance” to ensure that the proper products are being used and that current industry standards are being followed.

 
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Optimal Low-E Coating Placment for Double- and Triple-Glazed IGUs

Achieving optimal performance of solar control low-e glass and passive low-e glass requires proper placement of low-e coatings on the glass surfaces of an insulating glass unit (IGU). Placement considerations vary depending on whether the glass is solar control low-e glass or passive low-e glass, and whether the IGU is double- or triple-glazed.

 
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Cost Considerations in Specifying Vitro Architectural Glass

To make more informed decisions in the evaluation, selection and specification of architectural glass products, Vitro Architectural Glass (formerly PPG glass) recommends using an installed systems cost approach. The pie chart below indicates the approximate cost percentage of fabricated glass relative to a typical installed curtain wall total cost. The table, “Fabricated Glass Options,” indicates the relatively minor cost impact of selecting various Solarban® solar control low-e coated glasses by Vitro glass on the overall installed cost.

 
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Bent & Laminated Glass Demonstration

Here's an explanation of how bent and laminated glass is made, courtesy of Standard Bent Glass in East Butler, PA.

First, large sheets of glass are scored into a range of end-use sizes. Then, these individual lites of glass are edged on a vertical line and sent to a large industrial washer. Next, they either get laminated or bent.

About the Education Center

 

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Resources. Information. Support. From engaging videos on challenging technical issues to common industry terms, learn more about one of today’s most popular building envelope products.

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Fun Glass Facts

 

The first insulating glass units were developed in 1945 for the Pullman Car Company in Butler, PA.

 

A standard float tank can produce glass 24 hours/7 days a week for up to 15 years before it needs to be rebuilt.