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Why? A e s t h e t i c
(lemmy.world)
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this post was submitted on 09 May 2025
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With a custom made staircase? Why would the holes already be drilled? I'm not sure that blue color is the final color, or just a primer to prevent rust.
With the staircase I had it was simply 4 holes drilled in each stair and a short but fat screw driven through. This lead to bowing in the middle over time which made the stairs creak. So when I refurbished it, I drilled extra holes in each stair. As well as a thin strip of rubber over the top of the metal. Drilling in a relatively thin flat piece of steel like that is pretty easy. It wasn't particularly hard as it was designed to flex with use instead of being super hard and being subject to metal fatigue. The holes weren't that big, iirc they were 8mm.
I drilled the holes by hand and it was fine. Sure it's a pain in the butt because there were so many stairs. But that was kinda par for the course in a project like that, especially since every stair was unique with it not being a perfect circle. But for people who do projects like this for a living, they have one of those fancy magnetic base drills. Those make easy work of something like this.
The wood would most likely not be fixed to the wall and be designed with a small gap to allowing movement. Wood tends to move around a lot, so you want to have it free to move where possible. Just bolted to the metal would be just fine.
Why would they do the holes that fix the metal stairs to the floor and the wall and not the ones that are going to fix the wood?
It's also possible that, so as not to compromise the structure of the (already thin) metal by drilling holes in the risers, the stair treads themselves are attached to a carrier of some sort that's then fastened around the metal structure we can see.
I can't really see this staying intact very long as is. The metal uprights are already deforming slightly while just freestanding, so my suspicion is that there's an additional structure that spreads the load across the whole assembly and which has yet to be installed. Seriously, those lower steps would just sproing and dump you on the floor scooby-doo-trapped-staircase style the first time you tried to go up them.