A teaching building has two floors in total, each floor is 3.3m high, and the height difference between indoor and outdoor is 500mm; the main stairs are ordinary double running parallel stairs and closed staircases. Please determine the dimensions of the stair and each part of the stairwell, and write out the calculation process.

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Stair construction and layout

Stair is a type of vertical transportation in a building which consist of a series of steps in a flight of stairs that enable the vertical movement of people and materials from one floor to another. A staircase consists of steps that comprises of riser & tread, handrail, baluster, stair stringers, newel post and waist slab. The construction of staircase with all the components is termed as stair construction. A staircase is an enclosure that contains the entire stairway. The materials used for the construction of stairs are bricks, reinforced cement concrete, stone, lumber, steel and a combination of these materials.