The coastal town of Helensburgh is located in one of the wettest regions of Scotland, averaging more than 190 days and 63 inches of rainfall each year, and it’s also the site of an architectural masterpiece by famed designer Charles Rennie Mackintosh. Built in 1904, “Hill House” is a modern construction with a focus on light and texture, and its facade is made of gray Portland cement rather than a more traditional and hardier substance like lime.
While the material was innovative at the time, it hasn’t endured the wet conditions of its surroundings and has started to deteriorate and crumble as it soaks up moisture from the air and ground—the National Trust of Scotland, which manages the home, describes it as “dissolving like an aspirin in a glass of water.” To dry out the facade and hopefully preserve it for generations to come, the trust commissioned a giant, greenhouse-like box to sit over top.
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English YouTuber and educator Tom Scott visits the porous covering, which at 32.4 million steel rings is the largest sheet of chainmail in the world, in a short documentary that reveals how the uniquely designed mesh structure has become a landmark of sustainability and innovative conservation in its own right. He discusses the unusual reasons for a permeable wall, the ways the chainmail offers the proper amount of ventilation without sacrificing protection, and how the multi-story walkways allow for otherwise impossible views of the “Hill House” roof and upper floors. Join Scott on his tour above to see the enclosure up-close, and in case you missed it, make sure to watch his trip to this mountain of mannequins.