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This shows a diagram of the attic with 17 joists each separated by 40 cm. The outer joists are also 40 cm from the attic frame around the edge of the whole area. The frame is 10 cm wide and the joists are 5 cm wide. The attic is 825 cm wide by 900 cm long and the diagram indicates the position of the attic door in the top right of the space.