http://www.homebuildingandrepairs.com... Click on this link to learn more about stair construction, design and building codes. I just released a book called," How to Build and Frame Winder Stairs "and the video is an example used in the book. If you're interested in learning more, with simple step-by-step instructions, then go to Amazon.com and type the title of the book into their search box. Don't forget to watch more of these helpful videos to increase your knowledge about stair building, especially if you're planning on building the set of stairs in the future.