While not new, since the concept was already described by Christopher Alexander in its architectural theories, it only gathered some traction in programming due to the publication of Design Patterns: Elements of Reusable Object-Oriented Software book in October 1994 by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides, known as the Gang of Four (GoF), that identifies and describes 23 classic software design patterns.
Use a calculator to calculate the stair riser length or the number of steps you'll need. Divide the height from the first floor to the top of the second floor by a predetermined height of your choice for the riser. The typical height of a riser is 6 or 7 inches (15 to 17.5 cm).
Stair Codes 1.3 mb pdf file. As an exercise, let's imagine you need to make a stair that is 74.79 inches high, and 104.04 inches long. These measurements are taken vertically floor to floor, and about where you want the stair to travel to horizontally. If you've decided to try to use nine steps, your rise will be 8.31 inches, and your run would be 11.56 inches.