How Insulated Glass Changed Architecture: An Introduction to the Technological Breakthrough That Changed How We Live and How Our Buildings Work




When we think of a “midcentury modern” home, we think of glass walls. In part, this has to do with the post-World War II decades’ promotion of the southern California-style indoor-outdoor suburban lifestyle. But business and culture are downstream of technology, and, in this specific case, the technology known as insulated glass. Its development solved the problem of glass windows that had dogged architecture since at least the second century: they let in light, but even more so cold and heat. Only in the 1930s did a refrigeration engineer figure out how to make windows with not one but two panes of glass and an insulating layer of air between them. Its trade name: Thermopane.

First manufactured by the Libbey-Owens-Ford glass company, “Thermopane changed the possibilities for architects,” says Vox’s Phil Edwards in the video above, “How Insulated Glass Changed Architecture.” In it he speaks with architectural historian Thomas Leslie, who says that “by the 1960s, if you’re putting a big window into any residential or office building” in all but the most temperate climates, you were using insulated glass “almost by default.”


Competing glass manufacturers introduced a host of variations on and innovations in not just the technology but the marketing as well: “No home is truly modern without TWINDOW,” declared one brand’s magazine advertisement.

The associated imagery, says Leslie, was “always a sliding glass door looking out onto a very verdant landscape,” which promised “a way of connecting your inside world and your outside world” (as well as “being able to see all of your stuff”). But the new possibility of “walls of glass” made for an even more visible change in commercial architecture, being the sine qua non of the smoothly reflective skyscrapers that rise from every American downtown. Today, of course, we can see 80, 900, 100 floors of sheer glass stacked up in cities all over the world, shimmering declarations of membership among the developed nations. Those sliding glass doors, by the same token, once announced an American family’s arrival into the prosperous middle class — and now, more than half a century later, still look like the height of modernity.

Related content:

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Based in Seoul, Colin Marshall writes and broadcasts on cities, language, and culture. His projects include the Substack newsletter Books on Cities, the book The Stateless City: a Walk through 21st-Century Los Angeles and the video series The City in Cinema. Follow him on Twitter at @colinmarshall or on Facebook.


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  • bt says:

    While I do agree that new glass technologies have dramatically altered buildings, there are a few points I would temper:

    1. Most all modern buildings in the 50’s 60’s used single-pane glass. It was cheap and energy was cheap, so was the thinking. Dual-pane glass is very hard to work with because you can’t just cut to fit during construction. Dual-pane really only became standard after the 1970’s energy shock. And a lot of time it was more or less the same design, just using dual-pane instead of single-pane.

    2. The glass technology that more dramatically altered design was tinted / absorbtive and reflective glass and that’s more about air conditioning than heating. That’s when building forms were stripped of sun shades, overhangs, operable windows and all the other things people did to keep the sun out / keep cool. Just look at modern buildings in the 1950’s and then in the 1980’s. It changed mostly because of the new types of tinted and absorbtive glasses that were available.

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