We moved into our house 2 years ago and now it's time to tackle the crumbling stairs. I've talked to a few people more knowledgeable than myself and I don't know if I've become any wiser...
The 2 lowest steps are directly on the ground and probably move around with the frost. The floor and the first step are resting on a wall that goes down over a meter.
As a layman, if I think a bit freely, there are 2 options:
1. Remove the lowest steps and pour new ones.
2. Build a wooden staircase over the old one.
The easiest seems to be to build wood over it... But how do you think the stone stairs will hold up underneath? Will it stay together? Maybe you could put something like roofing felt under the decking?
Could the stairs also have been salted in the winter? It destroys the concrete immediately and deeply. Your stairs also appear to have been repaired several times but are now beyond repair. I would have chipped away everything and then cast new stairs or built a new wooden staircase. Do not build a wooden staircase over the concrete; it is too damaged for that.
The columns visible in the picture lead up to a balcony and I'm worried about chiseling away too much. In that case, it might need to be done in stages. How do you mean the stairs are too poor to build over with wood? I'm considering placing stringers in front and building up a new staircase. However, the upper part of the wooden stairs must rest on the existing floor. Hopefully, the columns stand securely on the underlying wall. Or? Is there a risk of building over the problem and having everything crumble without being visible?
Now it is difficult to determine just from a picture, but I do not think you should build a staircase over the existing concrete since it will continue to crumble. At least remove the first two steps since they are the most exposed.
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