https://www.homebuildingandrepairs.com/stairs/index.html Click on this link to learn more about stair building, design and home repairs. Here's another problem created by building designers, do-it-yourselfers and stair builders and it usually has something to do with the top section of the deck where it meets with the stairway and there's either a nosing or no-no's. I'm guessing that you won't have to look very long before you find the stairway built like this in your area. I see them all the time and it's usually an extremely easy problem to fix, once you're aware of it.