Only on Læsø
Nowhere else in the world are there as many seaweed roofs as on Læsø, and nowhere else are they made in the same way as on this island with their very own, special history. The history is long and interesting and goes back to when the first people settled on Læsø. It was not until after the Viking age, because there were no natural harbours on the island out there in Kattegat.
There were no materials for roofs, and because it was difficult to transport for example reeds for thatched roofs to the island, someone ended up having a strange and fun idea: "Why don't we use all the seaweed lying on the beaches? If we put it on in a thick enough layer, it will probably hold out the water".
No sooner said than done, which is the reason why there were seaweed roofs on pretty much all properties on Læsø many years ago. About 300, according to popular belief.