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Stair build
March 18, 2017
10:55 am
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Ness

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Hi Paul,

This is quite a complex project and will need some thinking to get all the details sorted out.

Firstly I would suggest that you make 2 separate stairs.

Combining both stairs will make it too difficult to work on the manufacturings details.

In general it will be better to work each stair individually and for client presentation  export the 3D dxf file to SketchUp.

If possible, I would also try to avoid modelling the first floor  attached to the stair.

I’m actually away from my office so can’t give you a detailed review just now.

Can I suggest that you repost you project as separate stairs and I’ll look at it again ASP

cheers,

Ness

March 17, 2017
12:25 pm
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Paul Brumfield

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Hi Ness

Thanks for the feeback.

I had not changed any of the step and riser penetrations from the default setting but will do it when I get my design something like the client want.

I have since worked on an alternative plan for the client and this is what I came up with. He wanted to see a 3D visualization of both stairs one on top of the other. It took me a while to play around and get it to work but I think, its about there !

Would you be so kind to have a quick look and give me your opinion please.

I think if I can do the shaped parts economically the client will go for it. They have given us some nice stair projects recently and I have sent some photos to Stefan if you are interested in the results.

Kind regards

Paul

Kings Cliffe Joinery Limited

March 14, 2017
11:01 am
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Ness

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Hi Paul,

Nice to hear from you again.

Your stair looks good.

StairDesigner will draw the string developments so you can use them to mark out the laminates for the curved section.

For some gentler curves, cutting the handrail from the top of the stringer makes perfect sense and can save a lot of time.

However, in your case things are a little different and there are 3 major points you have to beware of.

StairDesigner will draw the inner face development so you’ll have to draw yourself the outer face that will of course have the same rise but will be longer and therefore be at a different angle.

On a tight curve like this the variations can be significant and make gluing up quite tricky so it’s always necessary to add plenty of extra material width.

The second point is that StairDesigner calculates the handrail at a vertical height of 900mm from the step nosings.

Although this is hypothetically right you’ll find that moving down a quickly descending curve the handrail will seem to be very low.

This is a sort of compression effect that gets more accentuated as the curved section gets tighter.

For this reason I would suggest that the handrail be raised around the curve. The exact height is not very important but it might  be necessary to add easings either within the curve or, usually better, on the straight sections leading into the curve.

And this leads to the third point. Because of the varying height and the handrail not strictly following the string, that is already tightly curved with a steep slope creating long and wide laminates, it might be easier to make the handrail separately. Making a separate laminated handrail using the same form, allows you to build in plenty of lee way for cutting an elegant shape, as well as eventually incorporating easings.

I’ve written a couple of articles on a similar stair I built here:

https://stairdesignsoftware.net/farm-house-stair-building

https://stairdesignsoftware.net/quick-tour-of-the-workshop-decembre-2011-curved-stair-ready-for-installation

https://stairdesignsoftware.net/installing-a-curved-stair-and-handrail

Otherwise your model looks OK. I’ve just one remark, Your step and riser penetration is actually 30mm, isn’t this a lot?

Personally I would only use 15mm.

Hope this is helpful.

Ness

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Paul Brumfield
March 14, 2017
9:21 am
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Paul Brumfield

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Hi Ness / Stefan

Its been a while since I’ve been needing some advice. I am currently looking at a staircase for a client and would like to incorporate a curve in the string. What I would like to know is, will the templates work for laminating the string ?

Would you mind taking a look at what I am proposing and give me some feedback.

I was hoping to do laminated strings so I can cut the handrail from the top of it if that makes sense.

Kind regards

Paul

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