Hi to All,
Can someone help me about how to model a Helical staircase and Balustrade in Sketchup?
Which kind of extensions do I need?
What is the best-simplest way?
Thank you,
D
You can do it with the native tools.
Plugins could make it easierā¦
Helical Stairs [often incorrectly, but very commonly, known as āSpiral Stairsā] have to follow a set of interacting rules - varying by building-type, country and area - but many rules are common.
You need to check your local building-codes - no plugin is going to do everything for you.
So letās assume that you establish that for your building/area the minimum width is 1000mm, the maximum taper of a tread is 15Ā°, and the rules say the āgoingā mid-tread is 250mm and the minimum going at the center is 50mm, and the treads should overlap by 25mm, and other rules say the āriseā needs to be perhaps 170mm [this depends on the going and the total rise etc]ā¦
You now have everything needed to make a component tread.
Draw out the constraints using the modelās origin as the componentās center.
Add 3d thickness to the tread etc.
Lift the treadās geometry up by the āriseā.
Exit the edit-modeā¦
Use the Rotate tool on the component-instance, press Ctrl to instigate ācopyā and rotate the copy 15Ā°.
Move the copy up by the āriseā.
Check that the treads relate to each other as you expect.
Now you can use Rotate+Ctrl to copy the two selected treads by 30Ā°.
Move them up by 2xrise.
Now repeat with the four, and Move up 2xrise etcā¦
Repeat until you have the required number of treads in 3dā¦
Now you have a set of radially array treads, each stepping up by the āriseā.
You can edit a tread and add some baluster posts and a sloping piece of handrail around a 3d-arc - look at followme etc.
If you hide the end edges of the rail theyāll fit together nicely with their siblingsā¦
The first and last treads will probably each need āmake-uniqueā and then editing to form different handrail forms bottom/top etcā¦
Stairs are one of the most complex things to design and get right - āspiralā ones are perhaps evn worse !
You can try ā1001 bit toolā too. Take a look no YouTube 
My StairMaker plugin will do curved stairs, spirals etc.
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Hi TIG,
Thank youā¦ but actually my focus was more on how to have an helical solid balustrade (e.g.)ā¦
I guess it is a sort of loft function (?) just weird is not normally included in a modelling program?
Hi Eduardo,
1001 bit tool looks greatā¦ but sadly it seems there are no versions for SKup 2017 
only up to 2015 version (?!)
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Hi gkernan,
where is you extension, do you have a link? Is it freeware?
Hi Dave R
Cost?
and alsoā¦ how does it make the staircases? is it parametric? and after if I want to edit and personalize it?
e.g. if it is not perfectly helicas but more bespoke?
Making a āhelical pathā [or a similar complex path] is relatively straightforward.
There are several tools to do it, or you can make it manually.
You can āweldā the parts into a smooth curve as desired - there are several tools for this.
You will then need to extrude the handrail profile along it.
The native FollowMe tool is fine for a circular profile - just make sure the seed-face is perpendicular to the start of the path, select the path the activate the tool and select the face - you might need to reverse faces if it is made āinside outā.
If you have another profile - e.g. a rectangle, then FollowMe will unexpectedly skew it as it rises up the path.
@eneroth3 made Extension | SketchUp Extension Warehouse to ensure itās kept oriented consistentlyā¦
Looking at the link, I canāt help but chuckle at the idea of your plugin doing Tungsten Inert Gas arc welding in SketchUp. I canāt be the first one to make that association. 
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Thatās āMr. Tungsten Inert Gasā to you pal. 
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His manors argon.
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Thank you TIG!!
I will have to tryā¦ 
Thank you ALL guysā¦
I will have to definitely tryā¦
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