Easy to install is relative :) Place a couple of these under my kitchen center before remodeling as insurance as the original metal frames supporting my floor have rusted. Attached them to solid concrete blocks, then bolted them to the joists, then bolted them to the blocks. Make sure to align the blocks and columns. You feel strong enough. You should probably use a bottle jack to jack up the house, as using the screws on the jack's legs seems "if in doubt" as you actually have to turn them to get the movement going. If you put several - raise each one a little. In my case, I backed rather than raised, so it wasn't an event. However, once you get everything set to the correct height, I think they can handle a lot of the floor's weight. I felt comfortable because I saved a lot of money at work that afternoon and the results look very professional. In my kitchen, the floor is solid, doesn't squeak or squeak. Good value for money.
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