What supports the balcony floor joist?

The balcony floor joist is primarily supported by columns. Columns are vertical structural elements that bear the weight of the balcony and transfer loads from the joists down to the foundation or ground below. They provide stability and are essential in maintaining the structural integrity of the balcony by supporting both the weight of the balcony itself and any additional load placed on it, such as furniture or occupants.

In contrast, balcony railings serve as safety barriers but do not contribute to the structural support of the floor joists. Roofing materials are used to cover and protect the balcony but do not bear any load from the balcony’s structure. Vertical beams, while they can provide support, are typically designed to work in conjunction with columns to enhance structural strength, depending on the configuration of the building. However, for the specific function of directly supporting a balcony floor joist, columns are the primary and most critical elements.