Bottom part of stairs

Hi you all,

perhaps this issue could be solved with a normal drawing of sketchup. If it is so, tell me. Honestly with terrain feature I didn’t get a very clean surface.

How can I draw the bottom part of stairs?
Is there an extension and how can i do it?

I made several tests without success.
Thank you

From your image it is hard to understand exactly what you mean. Would it be possible for you to share your SketchUp model here?

I am not at home now. I will try later. For the moment: I mean the curved plane that covers the bottom part of the steps and rises. Giving a smooth appearance instead of zig zag.
This is an existing stairs, with irregular steps. So I can’t use tricks like blocks

here I am.
here there are the 3d file and a second screenshot with the bottom part realized with terrain

I think that @slbaumgartner Was actually asking you to share your SketchUp file, as opposed to a screenshot. This will make it a lot easier to understand what it is you are trying to do…

the 3d file is too big. I try with dropbox

Hi @TheOnlyAaron, I tried the first time but it didn’t appear on the post. It is too big, it should work now with dropbox

Maybe curviloft could help you, let us know.

1 Like

thank you @spawn! I try it now


mmm. It is not downloading it… ::frowning:

You need to join SketchUcation to be able to download from their PluginStore.
There is a free membership option on the ‘Register’ page…

You need to download the CurviLoft RBZ and also the LibFredo RBZ…

Then install both and restart SketchUp to sync everything…

From the zip file it appears you want to build a number of L shaped stairs?
If that is correct the landings are normally made with a few triangles and polygons. The key design consideration for those is to ensure the treads are of proper width at the " line of travel" which is the path a person would most likely follow when using the stair. For those building codes generally call for a 9" to 10" tread width at the line of travel.
If you are interested in other designs do a search in Fine WoodWorking they have published many articles that can you more info vs my. words here.
Here is hits from 1 search

first of all thank to all of you

hi @mac7595

yes, with plugin I didn’t get any solutions. Perhaps I am too geek for this extension.
Since they are existing stairs, I have to reproduce them, without any modification.
In this moment I am getting the best with terrain and with ‘‘smooth’’ command

Can you share the .skp file at least with the stairs?
Maybe someone else can help.
I’d also like to learn how to do it.

hi, yes here it is.

if you know something more clean (and also less absurd) please let me know. Because I have to still make several attempts before finding the right shape.

In your zip file the first and second stairs are different, is that design goal or part of your test cases;
I see no railing but it must be required so where is it or is design first to ??? floor open and rails required on out side and the warped surface is some kind of aesthesis?

hi mac, This is a work-in-progress file, not a finished one. I am still working on it. It is not finished at all.
My goal is to have a smooth surface in the bottom part, like the lowest stairs

ps: with geek I was ironic with myself. I am not very able with these plugins with curves (I downloaded also flowify, shape bender and 1001tools for this problem)

The shape you want is geometrically a helical surface.

Try a plugin such as the SketchUcation plugin SU Draw Parametric Shapes, which has options for a helical ramp with sides, which should draw the shape you need.

Too late for me tonight (1am in UK) to try it on your SU model, but it should work.

I may try tomorrow.

Thanks I guessed as much but wanted to dbl. check.
IMHO I think concentration on the basic design should be done first and then you can worry how the bottom will be finished almost as the last step.
Should I be using model 8 vs the orginal version 6 you posted??
For example I have problems because the version 6 stairs are enough different they do not fit very well at the “xxxxxxx” openings.
By the way you can replace one complete stair with another by simply using the component browser or replace them with motor cycles if you want:grinning:
I have been thinking knee walls may be needed where the stringers meet the winders.
It would be nice to know where the floors are.
IMO there is very little design difl between a spiral vs helical stair case. Spiral has center pole and the hand rails are helical.