A stringer is the frame of the stairway that holds the stairs. It looks much like a jagged knife edge when viewed without the steps in place. Most stringers are cut from one large piece of wood to ensure that it is strong to hold the stairs and the people traveling along the stairway. There are two stringers in each stairway, one for each side. The steps of the stairway are secured to the horizontal jagged edges of the stringers. These pieces for the steps are called treads. The vertical sections that run along the backs of each of the steps are called risers. All three of these together, along with a hand rail, make up the stairway.
If you have a stringer that has cracked or is not properly attached to the wall, you will need to hire a professional to repair the damage. In many cases, replacing the stairway is the best way to ensure that the stairs are safe again. The contractor will need to measure the space between the ground and the top landing in order to properly cut the stringers for the new stairway. They will also need to take note of the each tread and riser size in order to provide you with steps that are not especially high or narrow. Creating a new stairway will not take a professional very long to accomplish.