The answer is Slate. It is similar to Shale. It is still used but much less than 80 years ago.
Slate is used in upscale roofing applications.
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Corrugated tiles means sheets of tiles that are using for building purpose. Such materials are using for design and making house roof looking great. Such tiles are May available in stores like wholetiles
it would be 81 tiles
Slate
It depends on the units used for measuring the tiles. Obviously, the number of 18 inch x 18 inch tiles required will not be the same as 18 cm x 18 cm tiles. And if there were 18 yard x 18 yard tiles, you would need only 1.
It depends on the dimension used for measuring the tiles. Whether they are 12 in x 12 in or 12 cm x 12 cm will make a huge difference to the number of tiles required!