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Multi-story spiral stairs

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    Multi-story spiral stairs

    First of all - stairs suck and there is no excuse for this decade plus long problem.

    That aside, I'm having nothing but problems trying to model a 23 foot tall spiral stair with a landing halfway up. Can somebody explain the process in a way that makes sense. Please use small words, our coffee maker cant' keep up with Monday.
    ​My ID was stolen. Now I'm only called Dav


    Hi David.

    -Draw a circle concentric whit the stair
    -Use "Full step spiral" (That makes the whole staircase. It does not matter)

    -Modify the radius of the stair and place it concentric with the circle.
    -Reduce the step of the stair to obtain the first section

    -Use again "Full step spiral" for the second section (a horrible stairway will be created but do not worry)

    -Modify the radius of thesecond section and place it concentric with the circle. (Voila!!!! It make beautiful)

    -Adjust the landing

    Attached Files
    Last edited by duende123; June 4, 2018, 09:17 PM.
    "-Bueno, pues ahora que los dos nos hemos visto el uno al otro -repuso el
    unicornio-si tu crees en mi, yo creeré en tí, ¿trato hecho?"
    Lewis Carroll


      I'll give it a shot tomorrow when I have a bit more time. Are you certain this works with a spiral stair that has a tight radius? As in a 36" wide stairwell with the inside radius only 8"?
      ​My ID was stolen. Now I'm only called Dav


        If it's any help I've managed to make a spiral work with a tight inside radius - it's only a single storey but should work for 2 storeys.

        It was a heck of a job to design though - I drew out as best I could in 2D based on the relevant British Standard (see sketch attached) and then aligned as best I could Revit's attempt at a spiral via the stair tool.

        As you can see it isn't a perfect alignment but it was the best I could achieve - and this was to go to the steel erector (well, 'blacksmith' we still call them here in Hobbiton ) who had his own ideas on design.

        Apparently it got built and passed Building Regulations.

        This was on a private residence - if it had been say, an escape stair from a commercial building I don't think such a tight radius would have been allowed in the UK - I seem to recall doing them as helical stairs in the past - i.e. with a much greater internal radius.

        William Sutherland rias riba
        WS Architecture Ltd


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