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Unusually, the inspiration for this striking little building was a homemade wooden canoe. Its Spanish architect, Mikel Landa, decided he wanted to build a kayak in his spare time. 鈥淚t was something personal,鈥� he says. 鈥淚 built a kayak in my garage at home over two years in my evenings and weekends. It taught me a lot about working with wood. When I finished it I thought it would be interesting to use this form of construction in a building.鈥�

His chance came when his practice Landa-Ochandiano Arquitectos was asked to design a visitor centre for the A帽ana salt valley near Bilbao in northern Spain. Salt has been extracted from saline springs since 822AD and the area is being regenerated and turned into a tourist attraction. Landa wanted a building that would act as a landmark for the saltworks. 鈥淚t had to be something distinctive that people could easily see and feel at ease with once they were inside,鈥� he says. 鈥淭he round shape was right for both these reasons.鈥�

Landa built his kayak using strips of American ash, which is flexible and easily bent to shape. These were glued together around a mould. Once all the strips were fixed together it was covered in a clear resin to make it waterproof and the mould was removed. For the building, a shell-type structure was not possible because of the scale, so it has a frame made from 14 glulam ribs.

The building is constructed between the walls of an old salt store. Landa says he particularly likes the juxtaposition of heavy rectilinear walls of the old and the organic curves of the new. A wall was removed so visitors could enter and leave the building at one end.

The visitor centre is entirely self-supporting. The only link with its surroundings is the stainless steel flashing that forms a waterproof join between the old and new buildings.

Landa also selected American ash for the interior, partly because it is ideal for the shape, partly because it is light, and partly because its interesting marking 鈥渕akes you feel like you are in a ship鈥檚 hull鈥�. A simple mezzanine floor allows visitors to appreciate the full shape of the building.

The ash is fixed to both sides of the glulam ribs and the gap in the middle is insulated. Like the kayak, the outer layer of ash is painted with a liquid waterproof coating. To make the building look as natural as possible, a further layer of a naturally water-resistant hardwood called ipe has been fixed to the outside of the building. This will weather to a silvery-grey colour, rather like an old boat that has been left upside down on a beach.

Original print headline - One hull of a building