Masonry Magazine January 1981 Page.24
Interesting uses of glass block in private residences. Architects: Tasso G. Katselas (left picture) and James Ethan Miller (right picture). Special thanks to Pittsburgh Corning Corp. and Fred Beyer & Co. for providing the photos accompanying this article.
Glass Block Makes a Dramatic Comeback
Renewed interest among designers spurs increasing usage
Glass block, the translucent/transparent masonry unit that was a popular building element for schools and factories between the thirties and the fifties, is enjoying a rebirth in architecture. According to research conducted by the International Masonry Institute, designers are rediscovering the design capabilities of glass block and taking a new interest in its energy efficiency potential and aesthetic appeal.
Glass block can transmit light and at the same time provide advantages such as security, privacy, design interest and permanence. It also can cut heating and cooling energy costs because of its substantial insulating capabilities, and certain varieties can be used in passive solar applications because they allow the sun's heat to enter the building yet deter heat from escaping.
Despite these advantages, two years ago the only North American manufacturer of glass block, Pittsburgh Corning Corporation, was planning to discontinue production. However, when architects learned the manufacture of glass block was to end in December, 1980, many of them joined in a letter campaign to persuade PPG president John Baldwin to reconsider. This, plus an independent research firm's prediction of increased demand, convinced the company to continue manufacturing the product.
"Demand for glass block has picked up tremendously in the past two years, particularly for interiors," according to Fred Beyer (MCAA), a Chicago-based specialist in the installation of glass block for more than 40 years.
Laying Glass Block Tricky Business
Unlike other types of masonry, glass block has a smooth surface. Even wit with extremely thick mortar, its non-porousness requires skill in installation. Says Beyer: "Laying a six- or seven-pound glass block is like trying to float it on top of a piece of cork in water. A well-trained mason with a good set of hands and a good pair of eyes is needed to do the job right."
With correct installation, glass block provides great versatility, a feature architects appreciate. Like other types
San Francisco corporate lobby. Architect: Environmental Planning and Research Inc.
24 MASONRY/NOVEMBER/DECEMBER, 1981