Hi Michel,

Thanks for the swift feedback.

The length of 2580 in SD is based to the front nose of the first step. With an angled step it causes some shortage as you can see on the picture

You can solve this by entering a value in the property field “length beyond the first step”. In your case adding 21 will just reach the beam and adding another 20 will put the stringer on the beam

Well, the issue with this explanation is that even the first nose is 21mm away from the beam so it must be something else. Regarding the suggested solution, of course is easy to add 21mm to the stringer. However, without importing it in SketchUp I would have never known SD is introducing unexpected things. I have basically no control if, for example, I decide to begin the stringboard from a different place (the gap might be different than 21mm).

BTW, the angled step was basically introduced as a way of maximizing the tread width without loosing much space. Not sure if there is a way to optimize the angle but I’m open to suggestions

The right stringer should normally be in connection with the newel. So the construction with stringer, newel and first step and riser is providing the needed support if they sit on the beam. Actually I do not yet see the full picture as your design is not finished there yet. If everything is positioned in the way you need it to be then I can take another look at it.

As I want to use the same position as the old newel post (so I don’t have to change the stairs from below), the new newel post is not siting on the beam and, frankly speaking, I would not trust to support the right stringboard (the position of the old one in SketchUp drawing is correct so you can have a look). That’s why I intend to connect both stringboards to the beams directly (same as for the existing stairs) but seems challenging to do so, at least for the right one. I have couple of thoughts but obviously I count on the expert advise of someone who dealt with many stairs

No you cannot import this back in SD. The extension of the stringers can be done in a CAD program so that you correct the DXF of the stringer and machine them correctly.

Assuming I will alter the stringers in SketchUp, would it be possible to take them forward from that CAD program for generation of execution drawings? (I’m still struggling to find someone who can machine the stairs but so far it looks more like I will have to do it in the old fashion way, with drawings. However, not excluding the “classic” output for CNC).

Best regards,

Daniel

michel melon said
Hi Daniel,

1) A typical over head space is between 2000 and 2100 mm.

Clear. It makes things easier, requiring less changes – was inclined more toward 2200mm. Anyway, by keeping the over head space within typical values a gap between the right stringboard and the floor from the attic will appear, requiring closure with a handrail

2) It has to do with the type of newel post you are using. You have a corner newel post and these are restricted in some movements. You need to use an intermediate newel post that gives you more possibilities. When you add the newel post do not select the square on the edge but move a little on the stringer-line and it will change to anintermediate newel.

Clear. The truth is I was not paying enough attention when adding that newel post (I even used the wrong size)

3)Can you specify which hole ? Currently SD can do the step-shape but the riser will not follow the shape. This you have to complete on a cad program.

Clear, a current SD limitation

4) A landing step has in my way of making stairs a typical length of 70mm. This does not need to have more as it is a connecting piece to the top floor. If you make the last step part of the floor which is around 21mm thick I would certainly make it as small as possible to put the riser in place and a small nose. It depends on the way you want to make it. Draw me a small sketch on how you see it for your application and I will check it.

Will need to play a bit more with the details and will share with you a sketch of how I’m thinking to solve that detail, for comments/suggestions

regards

Michel 

  

There is something else I noticed and trying to understand what triggered it. Although I planned in SD to have the end of stringboards aligned with the existing beams (Flight#1, Left length 2580), I still have a 21mm gap (horizontally). What is causing it?

From previous responses I understood that for underfloor connection I will need to extend in a different CAD program the stringboards. This wouldn’t be much of an issue for the left stringboard but is more challenging for the right one, which ends quite high above the beam. Any suggestions on how to tackle?

A different question related to the above aspect: I will use SketchUp to draw the extensions – can these addition be imported back in SD for generation of execution drawings or there is another route?

Best regards,

Daniel

Hi Michel,

2017 version file was very useful – now I see couple of limitations. Perhaps you can help me to clarify the followings:

– What would be a typical/minimal over-head space? Is clear that I will have to discard/re-position 1-2 beams

– I cannot figure it out how I can move the bottom newel post on one direction (SD). I can move it on lateral (and seems I managed to position it quite well) but cannot move on the other direction. Has something to do with the end of the stringboard?

– First step shape generates a hole near the newel post. How can be filled? (SD or SU)

– Last step (actually the landing you suggested) is basically part of the floor. Should it be wider than 70mm, to give a good, solid step?

Thanks,

Daniel

michel melon said
Hi Daniel

Here is the sketchUp file with the 3D stair

I positioned it on the top floor and see it sits on the bottom floor below which is 40mm.

Those are under floors. Finished floor will come on top of them (21mm, wood). I guess the best positioning would be at 23-25mm from the underfloor (assuming 2-4mm for adhesive)

So you need to add length to the stringers and newel below to reach the beams. If you add another 21mm on top, you need to add that height to the stair 3231mm total height. The last step is then to be replaced by a floor-panel if I understand correctly.

I’m adding 21mm wooden floor on both levels hence de total height remains 3210mm. Last step is actually the landing you suggested and it is basically part of the floor (I’m wondering if it should be wider than 70mm, to give a good step). Ideally, its top will be at 23-25mm from the attic’s underfloor

Also, I advise a restriction of the width of the second flight from 1090 to 1040 mm. As you can see the newels and handrail are not passing the floor opening.

The opening is still to be negotiated (last beam is not installed) to allow sufficient overhead space (which depends on the solution for the stairs)

I can probably give you another file but for you to open but I need the year version of sketchUp you are using.

Please save as SketchUp Make 2017 (17.2.2555) so I can make the most of the imported file. Did not upgrade as the following versions are not exactly friendly for offline use.

Regards

Michel

  

Best regards,

Daniel

For some reason the SketchUp file appears as 0 b. Trying again to upload