Options for removing/repairing VERY squeaky hardwood floors?
We purchased a 40+ year old house that has some flooring issues. It's a split level, and most of the top floor has old hardwood that is in need of a refinish (at least). The floors are slanted (which is the subject of another post and another time), and EVERY. SINGLE. STEP. squeaks, creaks, or cracks. There is also very obvious flexing in several areas. You walk through the house in the middle of the night and it sounds like the place is coming down. I think it's just an old, brittle home.
We have twins on the way, and wanted to carpet much of this floor of the house. This is opinion, so not looking to argue, but the wife would like it if the babies could crawl around on carpeting. Now I like hardwood, but it wouldn't break my heart if we removed this old, creaky stuff, replaced the subfloor, then put on a carpet pad and new carpet. What's the process for this? I've done lots of DIY jobs, but never removed an entire floor down to the joists. What is a good subfloor to use? Is it common to remove hardwood when installing carpeting? Or should I attempt to repair the squeaks then carpet on top of them? No idea how I'd do that since there are so many.
FYI, being a split, the basement underneath is finished. No easy way to get at the joists from below.