A wall is then developed around the brackets. Then the concluded treads are bolted in position. These treads might be of steel or Wooden or Wooden clad steel. Cantilever techniques must be developed by a structural engineer, so that they continue to be horizontal and rigid with use with time. https://staircaseinspirations.weebly.com/blog/the-rise-of-cantilever-staircases-in-contemporary-homes