Tighten floor joists... What does that mean? That's so ambiguous that I bet they did exactly nothing and said that they did everything they could.
So let me get this straight. When you're in the master bedroom, walking on the floor, it literally feels like it's not attached to the joists? If that's the case, then the obvious solution is to get the floor screwed. If you're unfamiliar with that term, it means to add more screws to the subfloor to better affix it to the joists supporting it.
Typically, when a framer builds a wood frame structure, he lays the subfloor and then pops maybe 8 nails or screws into each piece of 4x8 plywood that your subfloor is made out of, to put it in place. After the house is built and enclosed, he (or a subcontractor) comes back and "screws the floors" - puts in a f'load more screws with collars on them to firmly keep the plywood flat on the joists and reduce future creaks from developing.
This has obviously not been done in your master bedroom. And of all the places...
So the next question is what kind of flooring do you have? Carpet? Hardwood? Hopefully carpet. If so, tearing it up, screwing the floor and putting the carpet back down is a job that can be done by lunchtime.
But just for the heck of it, I want to further explore this whole idea of "tightening the joists". What exactly did they claim to do during this "joist tightening" session?
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