http://www.homebuildingandrepairs.com... Click on this link for more information and videos about stair building, repairs and design. Here's the answer to a question everyone seems to be asking, Why Do My Stairs Squeak? Well believe it or not, there's a good chance that a part of the stairway is loose and rubbing up against another part of the stairs, framing or building. Most of the time it's going to be caused by the back of the stair tread, lumber shrinkage and of course the infamous nail as the tread moves up and down while the stairway is used.