In-between spindles per tread

Zero in-between spindles are provided standard with spiral stairs that are 4’-6” diameter or smaller, which are not code compliant. Stairs with multi-line railings also have zero in-between spindles.

(1) in-between spindle can be provided per tread for non-code compliant stairs of any diameter.

(2) in-between spindles can be provided per tread for non-code compliant stairs of any diameter.

(3) in-between spindles are included on each tread for code compliant stairs that are 5’-0” diameter or larger.