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What are Storm Windows?

Michael Pollick
Updated May 16, 2024
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Storm windows are engineered to withstand the effects of extreme weather conditions, whether they be high winds, hail, or driving rain. Some manufacturers use tempered glass to provide protection from debris, while others may use polycarbonate plastics instead of glass. Many also feature the same design features as the standard windows they protect. Individual panels may be raised for ventilation or unhinged for easier cleaning.

Most conventional windows do an adequate job of protecting inhabitants from the elements, but very few are engineered to withstand extreme weather conditions. During storms and other severe weather events, standard windows may be struck by flying debris, or allow pelting rain or cold air to penetrate living areas. One early solution to this problem was the addition of wooden shutters, but a more modern solution is the installation of storm windows.

When purchasing these windows, it is important for homeowners to decide between interior and exterior models. If the standard window unit swings outward or local ordinances prohibit exterior modifications, interior ones may be necessary. Other standard sashes should allow for exterior storm windows, which basically act as a reinforced second set of windows, not just a protective barrier.

Installing exterior windows is not a job for absolute beginners, but many experienced do-it-yourselfers are able to perform the task without the need for a professional. Home improvement centers and hardware stores should offer complete sets already placed in frames and ready to mount. Measurements should be taken first to ensure a proper fit, although kits often include extenders for irregular window sizes and uneven sills.

Exterior storm windows should fit snugly in the space between the exterior wall and the recessed standard windows. Installers usually apply a special weather-resistant caulking around the sash to seal out any leaks, but no caulking should be applied to the bottom sill, since water must be allowed to escape before it pools up and penetrates the walls. The entire frame is then lined up against the exterior shutter panels and screwed into place. These windows should fit squarely to eliminate leaks and loss of insulation.

HomeQuestionsAnswered is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Michael Pollick
By Michael Pollick
As a frequent contributor to HomeQuestionsAnswered, Michael Pollick uses his passion for research and writing to cover a wide range of topics. His curiosity drives him to study subjects in-depth, resulting in informative and engaging articles. Prior to becoming a professional writer, Michael honed his skills as an English tutor, poet, voice-over artist, and DJ.
Discussion Comments
By anon290433 — On Sep 09, 2012

I was a bit shocked not to see energy advantages mentioned extensively, too. Green products are a hot ticket in today's market as is hurricane protection. I read somewhere that the U.S. government estimates that home windows account for 40 percent or more of your home's heating/cooling loss. Here in Florida, crystal clear, hurricane rated storm windows are hard to find.

By anon232618 — On Dec 01, 2011

Thank you for your article, "What are storm windows?" I was surprised that you did not mention anything about how storm windows improve energy performance in your article.

I have a few storm window studies on my website that look into the improvements in energy efficiency seen when storm windows are installed over an existing window. I think the results are surprising! High performance, dual-pane storm windows will be coming soon and will pay for themselves in a matter of months. A high-performance window can make a lot more sense than a cheap vinyl replacement (especially on historic homes.) Storm windows make too much sense to continue to overlook them in our world of rising energy costs, especially given recent improvements in window building product technology.

Michael Pollick
Michael Pollick
As a frequent contributor to HomeQuestionsAnswered, Michael Pollick uses his passion for research and writing to cover a...
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