Graphical Construction Glossary >> stairs. >> general >> Spiral Stairs
The stair above is of a type that was and still is built very cheaply and marketed in a manner that may make it attractive. However my personal opinion is that although these stairs may be just the thing for ascending a medieval bell tower (see the previous page), or getting workmen into hard to get at places, they have no place in modern residential design. An architect or designer who uses one of these where a standard flight can be used is not doing his job! Please note these remarks are confined to the small spiral stairs that rotate around a small centre column.
Below is a table for calculating the rise, going and slope requirements for stairs with winders like the stair above. It is detailed in the BCA 2008 edition. It is provided here as a guide for the design of these types of stairs around a central pole and also for what I call helical stairs that have a circular stair well, IE. they have a wider radius.
As soon as the radius of the spiral increases and with it the width of the stairway then unlike the small and dangerous spiral above, it has the potential to become a thing of beauty.
I prefer the name Helical Stair for this type of stair.
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