Spiral Stairway Minimum Headroom Clearance
The minimum spiral
stairway headroom clearance is 6 feet and 6 inches.
However, the
Minimum Headroom Stair Clearance for almost
every other stairway is going to be 6 feet and 8 inches. Don't get these
two measurements confused.
The headroom clearance is going to be measured from the tip of the stair
nosing on the stair tread to the closest vertical distance, directly
above.
Special Tip: If you're designing a set of spiral stairs, make sure that
you allow for a minimum of 6'6" in headroom, otherwise you could find
yourself working on the demolition crew, as the
building inspector makes
you tare the stairway part and rebuild it correctly.