A wall is then created round the brackets. Then the concluded treads are bolted set up. These treads may very well be of metal or Wooden or wood clad steel. Cantilever actions need to be designed by a structural engineer, so that they remain horizontal and rigid with use eventually. https://staircaseinspirations.weebly.com/blog/the-rise-of-cantilever-staircases-in-contemporary-homes