Circular Stairs Measurements

Available in 3DM Rhino OBJ NURB SKP Sketchup formats.

Circular stairs measurements. Use our Size Comparison calculator to compare the dimensional properties of Curved Stairs with other related elements from our database. The minimum staircase width is the same as the minimum circulation zone width of 3ft 091m. Unlike Spiral Staircases the Circular Staircase does not require a fixed central column and it usually has two rolled stringers with treads attached between them.

Back to Spiral Stairs 101. Our designers can help you determine the best size stair for your space. If you think you will often have one person going up while one is coming down you should make your staircase about 48 in.

The walkine is located 50 cm 20 from the inner handrail or in the centre if the stair width is less than 1m 40. The maximum rise of each step is eight inches. For 3D Downloads of this element upgrade to a Dimensions Pro Membership.

The walkline is located half-way along the stair width. National Building Codes BOCA or Uniform building code requires a minimum of a 60 diameter spiral with 30 degree treads and a 4 on center maximum spacing for balusters. Wider than that will be more costly or impractical or the stair will be uncomfortable to use and if it is too wide you wont be able to reach a handrail on the side of the stairs if you ascend in the centre.

Stair width does not include handrails. Although the minimum radius to be considered in a helical staircase is 70 centimeters you should always give preference to stairs with at least 80 centimeters radius. Inside Level tread points around INSIDE LEVEL or flat as marked AROUND a circle on the floor.

The circular stairway handrail height shall be not less than 34 nor more than 38 measured vertically above the stair tread measured at the stair tread nose. Spiral staircases have to be at least 26 wide with each tread being at least 75 deep when youre 12 in. These are the rules from the 2006 International Residential Code.