what radius do you need for a spiral staircase
Generally speaking a stair with a diameter of 5 feet or larger is going to be very comfortable for your application. Itâs also important to note that CODE spiral stair packages require at least a 5 foot diameter. In other words, in order to meet building code you need at least a 5 foot diameter.Our 5â, 5â6â and 6â code package stairs will meet code in many states across the nation.f you are going through a hole in the floor your finished floor opening should be two inches greater than the stair diameter size. For example, if you are using a 3â6â spiral stair to get you access to an attic through a hole in the floor then you would need a finished floor opening of 44 inches x 44 inches.