Building code states that the minimum width of a landing should not be less than the width of the flight of stairs that is served.
Stairs and Landings - Landings are used to break up runs of stairs. Stringer Length - the stringer length calculation is the minimum length of 2x12 material that is required to layout and cut the stringer. It can also be useful for cutting the angle on the top of the stair rail pickets. Stair/Rail Angle - the angle is most useful for determining the bevel cut on a stair rail post. Headroom - the headroom should not be less than 6' 8" (2032 mm), measured vertically from the stair tread nosing to the nearest ceiling object. Stringer Position - The stringer position refers to how far below the finished height of the upper landing the stringer will be attached. If the Stringer Mount Type is Standard, the number of risers will be one more than the number of Steps on Stringer. If the Stinger Mount Type is Flush, then the number of risers is the same as the number of steps.
Number of Steps (Risers) - The number of risers is not necessarily the same as the number of Steps on Stringer. Typically, a single 2x12 or two 2圆s are used for stair tread material. In a given run of stairs, the greatest tread depth should not exceed the smallest by more than 3/8 inch (9.5 mm). Treads - the Tread Depth should not be less than 10 inches (254 mm). Height of First Step - The the actual finished height of the first step is the same as the Typical Step Height, but when you cut the stair stringer, the First Step Height is always the Step Height minus the Tread Thickness. Open risers with openings more then 30 inches (762 mm) vertical to the floor should not permit the passage of a 4-inch-diameter (102 mm) sphere. In a given run of stairs, the greatest step height and the smallest step height should not vary more than 3/8 inch (9.5 mm). Code states that this should not be greater than 7 3/4 inches (194 mm). Risers - the Step Height is the typical height of each step. It is equal to the number of treads multiplied by the typical Tread Depth. Total Run - The Total Run is the horizontal length of a stair stringer. The Total Rise should be not larger than 151 inches (3835 mm) between landings or floor levels. Total Rise - The total rise of a set of stairs is the vertical distance between the bottom of the first step and the top of the finished landing. It is used to determine the length of 2x12 material required to build the stair stringer. The stringer length is the tip-to-tip length of the cut stringer. In a set of stairs 36 inches wide, there are typically three stringers (one on each end and one in the middle). They are cut from 2x12s or larger material - the uncut portion of the stringer should not be less than 5 inches (127 mm) (see diagrams below). Stringer - The stringer is the structural part of a set of stairs. If you have any questions, please Contact Us. The information below explains the stair calculator results in more detail and provides related **building code information. Stair Calculator Results and related Building Codes**