Commercial Internal And External Spiral Stairs.

Spiral staircases have to be at least 26″ wide with each tread being at least 7.5″ deep when you’re 12″ in from the narrow end. 1200mm ( 48 ) stair total riser: However, we can also customize your outdoor spiral staircases if these common measurements don’t work for your.

Spiral Stair Building Code Requires Your Stair To Have At Least A 5’ Diameter.

Now that you know a little more about spiral stair diameters, check out our building code page to learn more about code requirements of your spiral stair. The client required only ten steps, so the step riser is a little bit high, but it is also okay to go up and down. Minimum stair diameter of 60 for a metal stair and 64 for a wood stair;

Most Spiral Steps Are Angled At 30 Degrees, And Each Step Rises Between 4” And 7”.

These are the stilt floor and first floor plans indicating the semi spiral staircase. The minimum space required for a spiral staircase will vary depending on whether the stair is used as a means of egress or if it is considered a monumental stair (not used for egress). From there, paragon’s diameters increase in 6” intervals.