Marching stairs

The oldest and most common staircase is marching stairs. Usually they are made on scums and bowstring. The steepness of the rise of such stairs is in the range of 30 … 45 degrees. They are used where there is a lot of free space. Marching stairs occupy a significant area, so if the room has a need to save a place, it is better to choose a staircase of another structure.