Step 2 measure up from the ground on each step to the desired height if there is no existing handrail on the staircase.
Spiral staircase railing height.
The staircase radius is the dimension from the staircase s centre to the outer edge of the handrail.
Choose a height between 30 inches at the low end and 36 at the high end.
The way this is measured is to begin at the leading edge of the stair nosing and run an imaginary vertical line upward until it reaches the top of the railing.
Handrail height on the stairs should be no less than 34 inches and no greater than 38 inches.
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Headroom minimum of 6 6 riser height cannot exceed 9 1 2.
Most straight stairs have a typical riser height between 7 7 5 whereas spiral stair riser height has a maximum riser height of 9 5.
Of clear walking path.
Stair railing height code measured vertically from the tread nosing shall be not less than 34 inches and not more than 38 inches handrail grip size type i handrails with a circular cross section shall have an outside diameter of at least 1 1 4 inches and not greater than 2 inches salter s standard circular handrail is 1 1 2 inch diameter.
Within this range there are standard radiuses on even decimeters.
0 in dia spiral staircases have 26 in.
Total height for rotation.
Weland manufactures spiral staircases with a radius of 600 to 1500 mm.
The reason for this is that as all the treads are set to a near 30 degree angle.
Calculate spiral stair and circular stair geometry print spiral stair plan diagrams online free.
Measure the radius of the spiral staircase using your tape measure.
This is the distance from the center of the center support pole to the outside edge of the staircase.
Tread path between handrail and center column a minimum 26 center tread width 7 1 2 in from the narrow end of the tread d.
Minimum stair diameter of 60 for a metal stair and 64 for a wood stair.
Please review technical data sheet for additional information on measurements.
Step 2 measure the height of the staircase using the same units as you used for the radius.
Spiral stair building code compliance.
This spiral staircase meets minimum 2015 irc requirements.