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god i wish i spoke physics jargon

yeah, I wish this made sense to me.

Amazing design. Its great to see they took vibration into account. I wonder how noisy they are however.

Too bad I have no place in my house for such a design, under-staircase storage is too precious for me to give up for this look.

I like this look, but I'm not willing to give up safety for it. If you trip and are about to fall, what do you grab? I've fallen down a staircase before jumping after my son who was a baby at the time.

absolutely beautiful, almost worth the inevitable head-wound!

Very attractive but how about telling us if it meets most local construction codes and how it fits into household liability insurance - do owners have to agree to assume liability outside of their insurance? Does the handrail extend the length of the stairs?
Yes my middle name is practical.

Trying to translate the physics jargon...I'm a little rusty...

"The secret is putting reinforcements to prevent the inertias that can be generated"

I think this refers to the small braces on each tread that are seen in the lower right diagram. I'm think the designer means inertia as in second moment of inertia. It's a technical term that describes an object's resistance to bending. Think about the way an I-beam is used to span a long distance without bending while a flat beam of the same mass could not. A simple way to think about it is that the braces will support the tread in a way that reduces the torque produced when you step on the tread. And that reduces the strain on the weld and makes the entire thing more secure.

Amphetamine--sound is just vibration that has a frequency your ears can break up. So the steps taken to minimize vibrations will also reduce the noise.

Sorry, that should be "I think"

Hope someone has good insurance, because if something goes wrong here... They'll be looking for someone.

Jordi's website points to their being in Spain, and from what I understand, they are not so litigious there. I.e. "if something goes wrong" people aren't automatically calling up for a lawyer to sue. It gets a little tiresome (maybe just for me?) on AT when people are always pointing out "code violations" that might not apply in other countries, from where we have no small number of posts.

I like the stairs, but I, too, would be more comfortable with some kind of handrail that ran the length of the stairs. Short(er) people won't be able to hang on to that ledge very far down. :)

randomname--it's not just you. I'm sure this meets all the requirements for the project's location; and to assume otherwise is to imply that the designer is both incompetent and unprofessional.

Also, since these stair access only a mechanical space (not a lofted bedroom, as I think many of us had assumed), that means they're meant to be used pretty rarely, and almost certainly by some one who is able-bodied enough to take decent advantage of the grab rail. And I have to say that I love the boldness of making something beautiful and sculptural which is, basically, functionless for about 364 days a year. If you can’t hide it, flaunt it!

It’s lovely.

I think implying that the wall is any sort of "handrail" is a bit dubious. It can only be used for the upper 2/3 of the stairs and it requires someone to brace themselves by placing their hand on an increasingly higher space relative to their position on the steps. Handrails are lower for a reason. People support their weight from below, not above.

It's still a beautiful staircase, but it's very much not safe.

Absolutely stunning. No idea what Jordi is trying to say but I'll take his word for it. It wouldn't work in my home but it looks fab in his.

Right. It is a stunning construct. Great job!

I understood it enough.
The steps are welded to a diagonal beam that attaches to the front floor and the back wall.

There is minor vibrations so a calm walk is preferred to a bouncing jaunty walk up and down.

Beautiful to look at but a bit scary to walk down on.
Definitely a no high heel staircase.

I agree - since it accesses only a mechanical area, and isn't used very often, why not make it beautiful? It will only be used occasionally, by the owner or a maintenance person.

Yeah, Cally is right about the setup. I understand some physics-speak, and that's what it looks like to me, too. It's a clever design. But I am clumsy and absentminded. I would run into it all the time.

..being in this line myself...making these isnt difficult...
making them affordable for the end user is...
Please check your spec - 100mm thick?? did you mean 10mm? flex should be minimal over 650mm width...
but a wider tread would pose problems... looks great tho!!
handrailing kinda defeats the look - as someone who
ordered would agree- ( and sign the necessary indemneties)
nice one!

P.S. the strength of the structure also relies heavily on the
integrity of the wall...at least double skin is required...altho
we've also been able to work with cast concrete walls, which
allow less volume on the stringer