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Stringer to facilitate ZIG ZAG cut out
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June 27, 2016 - 5:34 am
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Hi Tim,

Thanks for posting your stair project. 

Sorry to get back to you so late but we have had a rather hectic week.

It seems that the space for your stair is very tight and you would need a bit more room to get the stair to comply exactly with the standard stair rule. The standard rule is a maximum riser height of 195 and with 15 steps yours is 213.

To get the step height lower than 195 you have to increase the number of steps to 17 but this reduces the step width to 193 and as the minimum step width in the standard rule is around 220 you can’t get the stair to comply to the standard rule without changing the stair well dimensions.

So the best solution would be to see if it’s possible to extend the total length of the tread line.  this could possibly be done by extending the first flight. To know if this would be possible I would need to have more details on the stair well constraints as well as the thickness of the ceiling to calculate head room. Could you post some drawing of the stair well, eventually your architect drawings?

However, it’s not always possible to get a stair to fit the stair rule and sometimes it’s necessary to bend the rule a bit.

In tight situations like yours I would change the control values to something like this:

stair-rule-010-1.jpgImage Enlarger

With these values you can see that your stair will comply using 16 steps.

stair-rule-020.jpgImage Enlarger

This is creating a steep stair that is not ideal but usable.

However you don’t have a landing step, if you insert a landing step, which I always suggest you do if possible, then the tread line is reduced and if the step is more than 30 wide you move outside the control values. 30mm us a bit narrow and I would prefer a minimum of 60mm.

This is why it would certainly be better, if possible, to increase the total tread line.

For your design, the strings should be set up with a specific height above the steps .

I attach your stair with the stringers set to 50mm above the steps, as well as extended 50m in front of the first step.

I’ve also added the maximum landing step of 30mm and cut stringers behind it. 

plan.jpgImage Enlarger

Of course you’ll have to draw the exact stinger shapes from the StairDesigner drawings.

This stair will work, but it would be better if we could extend the first flight a bit.

All the best,


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June 23, 2016 - 4:41 pm
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First of all Hello!

As a first time poster I’m going to try my best not to ask stupid questions but I’m new to designing a staircase so all bets are off.

The stairs are for me and an upcoming loft conversion so I do not know the exact dimensions especially the floor height. But I have a drawing that guesstimates it so I can play and get the hang of Stair designer and can hit the road running once they break through. Then I can find the true dims.

In case it’s of any interest the first flight is 1325mm that then turns right and runs for 2245mm on the outer edge to another turn and a run of 1355mm. The plans given to me by my architect have 15 steps. I would prefer steps at 800mm wide.

My aim is to reproduce a zig zag stringer in 10mm steel to replicate this kind of look.

Zig-Zag-Stairs.jpgImage Enlarger

I will be adding the cut outs etc in my 3D cad program.

Now the issues are, I get errors eg it fails the stair rule and I cannot get the stringers to run look right or meet the steps in all places as I really do not know what I’m doing with the string board parmiters.

So.. Can anyone give me any pointers?

Many thanks Tim

PS also attached an attempt of a design

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