Freestanding staircase installed with 2x6 framing. Insert walls are added to create a circular wall rather than octagonal. 1/2" gap remains between staircase and wall to apply (2) sheets of 1/4" drywall. Drywall to be added before staircase is installed. This staircase design will be used to access the finished basement from the first floor and another will be stacked directly above to access the second floor. Circular staircase designed to incorporate additional airflow from basement.