The stair railing balusters must not allow a 4 inch ball to pass through.
Concrete spiral staircase plans.
Plan on adding at least 2 inches 5 1 cm to the chosen diameter of your staircase to ensure adequate finger clearance.
A spiral staircasemade of concreterises through the centre of an open plan office designed by architecture studio hildebrand in steinhausen switzerland.
Each tread must be at least 7 1 2 inches deep at a point 12 inches from its narrow end.
Your spiral staircase may need to be a certain minimum width if it s to serve as the main stairway for your home.
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There must be a minimum of 6 feet 6 inches of headroom at each step.