Random questions to which you seek an answer
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I would probably use synthetic tapered shims and tap them in very gently with a rubber mallet. If you feel any resistance that’s causing the skirt to bend or push inward, stop and reposition the shim. Depending on how level your pad or slab is, you may find areas with a slight gap that make lifting easier.
Once you’ve raised it enough with the tapered shims, I’d slide in square composite blocks or another type of non-compressible synthetic spacer around the perimeter to help keep it stable and level.
Edit: you may only be able to do this on the corners( me not knowing what’s behind that skirt) if you’re familiar with it from seeing the underneath at some point use your best judgment in placement. This is the simplest most cost-effective way to do it. Obviously, you have to have some sort of comfort level, but I would do this myself all day long.
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Contact your local company that deals in hot tubs and pools asking them what to do. We have a hot tub and it’s fairly easy to move with 2-3 guys, but the hot tub company will give you really good advice. Just tell them what you’re trying to accomplish and they will tell you how they do it.
Our last hot tub (upsize from a smaller one) was easy as the guys that helped do it all of the time.
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Number one they’re going say to drain it…
Number two nobody is going to lift it with water in it, at least a reputable company
Number three my idea is the best
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Seriously though, it all comes down to your ability and your tolerance for screwing something up and having to repair it. If you’re not comfortable with that possibility, I’d just have it professionally done. Or, at the very least, drain it first and then do it yourself. It’ll make the job much easier.
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The American Way…force it
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Exactly
German - take the time to get all the possible info and engineer an effective and efficient solution
Canadian - politely ask for help from the appropriate professionals (and be sure to adequately thank them after)

in my case $20.00 CAD a piece for two guys that were the size of small mountains. I would say that I helped (I tried), but those 2 moved the tub like I would a tub of ice cream.