ᐅ Cantilever staircase is unstable; the stair builder is not a true specialist.

Created on: 30 Jan 2025 16:37
F
Fenix34
Hello dear forum members,

I am completely desperate. We are currently building a house. I have wanted a cantilever staircase for years. Unfortunately, the companies specializing in cantilever staircases were outside our budget. That’s why I placed an ad on eBay Classifieds, and someone responded claiming to be a staircase builder. His price was “only” half of what the specialists charge, which is still quite a lot of money. In the end, he tried three times to attach the steps to the concrete wall. On the first attempt, the steps did not hold. On the second attempt, he used different anchors. On the third attempt, he used adhesive. The steps held for about three weeks with the adhesive. The staircase was never used, but just now we saw that one step slipped out and is no longer properly fixed.

After the first failed attempt, I became suspicious and contacted the Chamber of Crafts. Although he is registered there, he is not registered as a staircase builder; he is only allowed to manufacture wire frames.

Of course, we made an initial down payment. After the third attempt, we also paid the remaining amount.

I no longer trust him. Should I involve a lawyer and demand my money back, or should I give him another chance? I am worried that someone might get hurt if the staircase is not properly designed and secured.
M
MayrCh
2 Feb 2025 16:06
Fenix34 schrieb:

On the second attempt, the tradesperson removed the concrete anchors.
Properly installed concrete anchors should not be removed. That already seems to be cause number one.

Is the bracket an off-the-shelf part? They look more like backyard DIY to me. The systems I know consist of two fixed anchors on the wall side of the bracket, which are bonded to the wall and then additionally secured with at least two expansion anchors.

How is the impact noise of the staircase? Does it sound sharp against the concrete wall?
H
hanse987
2 Feb 2025 18:18
As my teacher always said: "The power of the locksmith is mighty when he works with leverage!" I think this fits well here too.

From my perspective, several points come together. As you already recognized, the construction in your example image is much better for the anchor. The disadvantage is that the step must be designed so that the panel is not visible afterwards. Regarding the installation of the steel anchors, I suspect an installation error. When anchors are properly installed, there is generally no slippage but rather a concrete breakout cone. My suspicion is neglected hole cleaning. I once attended a 2.5-day training at Würth on anchor technology. We installed two identical anchors, but only cleaned one drill hole. The difference was striking. The correctly installed anchor reached the load capacity according to the datasheet and showed a nice breakout cone. The other was simply pulled out of the hole at less than half the load capacity. One should imagine the drill dust like fine gravel. What I also don’t like is the very close spacing of the anchors.

If you agree with the company on a rectification, insist that someone from Hilti, Fischer, Würth, or similar be invited before installation to provide an anchor recommendation.
11ant2 Feb 2025 19:02
MayrCh schrieb:

How is the impact noise of the staircase, especially with the sound directly hitting the concrete wall?
There was no impact noise visible in the Pinterest pictures.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
H
hanghaus2023
2 Feb 2025 19:37
Normally, the anchors are cast into the concrete.

Construction site: inclined metal staircase attached to wooden wall, steel reinforcement protruding from the floor, workers at work.
A
Arauki11
2 Feb 2025 19:37
@Fenix34 The person, or you yourself, should at least have a plan for the project regarding the materials (anchors, screws, steps, etc.) as well as the execution and structural conditions (wall composition, etc.). There should also be various calculations involved, since they surely didn’t just buy anything randomly. Do you have these detailed pieces of information?
A
Allthewayup
2 Feb 2025 19:57
hanghaus2023 schrieb:

Normally, the anchors are cast into the concrete.

Of course, this requires proper planning carried out by experts and implemented by professionals—at costs that still allow those involved to make a living.

None of this was incorporated into the project. The result unfortunately speaks for itself.
It is impossible to offer any reliable advice on alternative solutions since the structural design of this concrete wall is unknown and it is unclear how the staircase will be further developed.

I would immediately recommend the original poster seek legal assistance; anything else will only cause delays.