Stair-nosing, what is it? Often referred to simply as "nosing", it is the edge of a stair tread. This is he part of stairs, that people often step on. It is an integral part of stairs altogether. The name developed, because it often protudes from the edge.

This might make one wonder why they matter at all. Stairs are stairs. They come in a number of shapes and designs. Why is nosing important in all of this? Let's get to that question, and look into the why's of stair nosing.