Stairs (2/2). March 22 nd , 2011. Stairs calculation . Slope = (2 x raise height) + tread depth. Example: (2x15) + 30 = 60 ˚. Raiser (mm). Tread (mm). Slope. Concrete stairs. Wooden stairs. Closed string stair with risers. Cut string stair with open risers. Spiral stairs.
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