Green Roof 1.0: The Seaweed Houses of Læsø, Denmark
Though green roofs are reemerging in the most advanced building designs around the world, for centuries, people constructed buildings out of materials immediately available to them in their surrounding environment. It is only a relatively recent luxury, for example, that people have easy access to roofing materials like asphalt shingles made hundreds, perhaps, thousands of miles away.
On the island of Læsø, Denmark there still stand a handful of buildings that are excellent examples of what communities would do with what was immediately available to them — if only they had any of it left.
In the Middle Ages the island of Læsø became famous for its salt industry. Hundreds of salt kilns were built, throughout the island, requiring constant fuel for the important final stage of commercial salt concentration. But on the island of Læsø—a community with a finite availability of natural resources—constantly feeding the hundreds of salt kilns eventually led to the island’s deforestation.
