When it comes to staircases, there is a lot to know about them. First and foremost, staircases have to be assembled in such a way that you have the minimal amount of nails showing. I assemble all my staircases with screws and glue. The top portion of the threads have two nails showing, the mouldings also have some braids to secure them. The skirts and risers do not have any nails showing at all. All my staircases come with the garanty that they won't squeak. I build all types of stairs (circulars,spirals,and straight staircases)