Superior picked the right company name.
When we moved into Tanglewood Forest (house constructed '86), it had been "repaired" on 2 separate occasions (drilled and poured concrete piers down to 12 - 15'). The lifetime pier warranty comforted us, but the company with the warranty is now out of business.
Less than a year later, we started to see cracks (that had clearly been patched) reappear in the interior walls and the foundation. As wet and dry years passed, we watched the cracks grow and shrink and refuse to be patched again as the house seemed to be in constant movement. There was a 1" wide crack in the foundation out front that ran up the brickwork and ran inside thru 2 bedrooms. If you had the eye for it you could easily see the house was tweaked out of square and the floor sloped here and there. Doors wouldn't stay open, windows stuck/froze. I moved latch plates for the front and back doors multiple times a year so we could lock them.
The worst part was we wanted to do some re-modeling, and I knew it would get ruined by the ever-shifting foundation/framing. So we waited, the walls started separating from the ceiling. Houses up and down our street were getting slab repairs using various methods (pressed piers were most popular). Bugs could get inside from the large slab cracks. I drilled holes inside and tried to water the dirt under the house during the super-dry summers. Things were not getting any better.
I do custom technical drafting, and pay a lot of attention to design/function. I really love the engineering/utility of a well made... anything. I researched this ridiculous foundation dilemma so much I'd dream about it at night. Why couldn't "they" just have built the slab correctly in the first place??
Superior's method is the next best thing to a foundation built directly on bedrock. In Tanglewood Forest, repairs that might have been acceptable like poured piers just haven't worked. In fact the inspector here post-leveling mentioned there is something difficult and unique about this area. I've even heard talk of "underground rivers", and one guy down the street apparently had his house built with a French drain system around the property - the story goes he was an engineer of some kind.
So short of building from scratch or extensive drainage configurations - if your house is moving, use a solution that bypasses the moving strata. All the repair companies will agree this is the correct approach, but only a fix reaching bedrock for support is going stabilize the slab permanently.
Anyway, after agonizing over picking a company (talking years here), I hired Superior (I talked with Scott there, he had come out back in 2013 to have a look).
They came out with 2 crews (seems another job finished early), and dog-piled on the exterior pier sites all around the house. German was the crew chief's name and he didn't talk a lot but was always there for any questions I had. They had everything dug, placed, pressed to bedrock, and ready for leveling in under 3hrs. The holes were much smaller than those I'd seen at other homes - just enough to fit the steel foot/sleeve under the slab. I couldn't really tell when they hit bedrock at first (just a pitch change on the hydraulic supply unit) - but I could tell when they released the ram because the floor would drop out under me - not much, just surprising. They ran a vapor-level to get elevations on the inside, and marked where 9 internal piers would go, using advanced aural-percussion techniques for locating the slab's beams underneath. Over the weekend I moved furniture away from the marks (they would have done it - I'm just that way).
Monday they came back, put up floor to ceiling dust barriers (plastic sheeting) and broke out the interior sites (18" holes, max), and pressed the piers to bedrock. Meanwhile, other workers got all the outside piers ready with huge bottle jacks, still other guys were getting out welding and cutting rigs.
The previous rainy weeks made the clay below help us raise the house somewhat - the most they raised a single location was under 3" - but what a difference! This place is straight-on solid level. The ancient patch-immune wall cracks have all sealed up tighter than the proverbial Dick's hatband. And the giant foundation bug-tunnel in front closed up so tight - the skim coat patch (from when we bought in '07) was popping off.
Then they welded all the sleeved feet to the piers, removed the jacking rigs, cut off the excess above the support weld, and backfilled the holes with the dirt they had bagged from before. Inside, they poured fast-setting concrete and smoothed it all out just so. They only had 1 crew on Monday but were done by 2pm. They do not mess around.
Foundation repair is something you absolutely want to do correctly, just once, and not ever worry about again; I can't make a higher recommendation than Superior. read more