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In case anyone comes across this thread in a search, I got a joiner to take a look and he reckoned that one or more noggings had been removed when the beam was installed, meaning some of the joists were free to move rotationally (very slightly) which would explain the boards loosening and the...

No because I don't know how to establish that - who would help me establish that? I don't recall any loosening of floorboards last winter, and this year there's enough that I'm worried, and the only thing that's changed is the knockthrough. The joists run parallel with the beam and the loose...

It's that it seems to be getting progressively worse (over a dozen loose and see-sawing boards), and I don't have the experience to know whether they just need screwing back down again or it's a symptom of something more serious. I don't know - who would help me identify this, a surveyor or...

I've got concerns about our floorboards loosening themselves up, and whether it's related to an RSJ that was installed last year for a knockthrough. SE did the calcs and were approved by building control. There was an initial crack in the upstairs wall, but according to most folk this was to...

If I wanted someone to check out the condition/situation with our joists and floorboards, would that be a joiner or a structural engineer? We're getting floorboards loosening themselves up, and I want to make sure there's not some joist movement/sagging going on that's causing this. Or could...

That's a possibility, but in the diagram you posted there is a clear space/view from the end of one joist to the end of the other joist, whereas in the photos there is something at right angles to it halfway along. I can't get a good enough view, but could this be a steel beam/wooden joist...

These photos show the joists that run front-to-back in my house. They're heading towards what looks like a perpendicular steel beam or a wooden joist but I can't tell which. Whatever it is, the bedroom wall is sat on top of it. 1930s construction, if that helps. So given all of that, the two...

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As time goes on I'm also noticing more and more squeaky/loose floorboards near this wall - the joists run parallel to it and I'm worried that one of them is shifting and causing the floorboards to loosen up. There are also some boards at a noticeably higher level than their neighbours, which I'm...

Beam was SE designed, can't see it being the wrong spec, and there's nothing really connected to that wall up in the roof (the wall is in the middle of the house). I came home Monday night to find the props installed and the supporting wall gone; Tuesday night the beam was installed on...

We had a downstairs supporting wall removed, acro props and steel beam designed by structural engineer. A week later have noticed some cracks in the plaster and corner of the door frame upstairs, and the wallpaper has moved apart on the other side, and while the door will still close it won't...