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Ideal roof tiles have minimal water absorption and shrinkage. Researchers in Okinawa are testing various clay samples and firing temperatures.
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They found that the best clay is from the city of Nago, and that's where the clay came from for the Seiden's 1992 reconstruction. However today, there's not enough clay in Nago to make the necessary 55,000 red roof tiles for the new Seiden and other buildings.
So they scoured other locations on the island and found a good source. Now they are trying to figure out how much recycled red roof tile powder should be mixed into the new clay to make the new roof tiles. They want to somehow reuse the old roof tiles.
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