Exterior staircase
This spiral exterior staircase is protected by steel pipes handrails on the 2nd floor.
The walls at the left are from real tinted wood and polyurethane.
At the center, the grey walls are insulated with 2 inch of polystyrene with cement-bond.
At the right is the green wall for giving privacy in the perimeter, to divide between a 3 store buildin and the pool area.