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).
Most stairs that are located between two walls have a finished width of 36 inches. To accommodate this finished width you will need to make your rough opening 37 inches. The end result of our layout procedure is: 10â run, 7 3/8â rise, 127 7/16â stair well length, 37â stair well width, 36â stair finish width.