Cross-bracing is an old method used to even out the loads between adjacent floor joists to reduce deflection issues. The load-bearing capacity of the floor structure is not improved.
The company, through my initial contact and responsible person, has responded that we will arrange the whole thing with some form of adjustment. The installers apparently got a little reprimand as well. They had apparently done it this way many times and there had never been any problems, but the person in charge here agreed that the customer should be consulted and it should be done properly. I guess it was just lucky that I managed to see it anyway.
Now I'm going to try to research how the staircase is actually adjusted and where the joists are located as a basis before we collectively agree on a plan forward. Thanks for all the input so far!
Regarding any existing load-bearing alternation due to the staircase, it already occurs out on the attic space.
The left beam in the picture is the one that runs along the staircase. Therefore, there is currently no load-bearing alternation against the numbered cut intermediate beam. However, I assume that the beam alongside the staircase receives the load from the truss in a non-optimal way since it runs a few decimeters beside it. So the question becomes - how does this displacement affect the possibility of using load-bearing alternation for the cut intermediate beam against it?
Brief update! The store that did the installation has now made the beam exchange by agreement and is covering the cost. The cut floor joist was both doubled and exchanged against the nearest roof beam. The municipality has received the corresponding addition to the already completed building notification and has approved it, so it seems I can sleep well for the moment!
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useless said:
