Lifting too far and supporting only part of a structure are the two that actually happen. Both are decided when the scope is written, which is why the scope is worth reading more carefully than the price.

Why partial scopes are tempting in St. Louis

Against a median home value of $185,100, the temptation to scope only the visibly worst side of a house is real and understandable. But the largest soil mapped here is hydrologic group C, and the ground under the untouched side takes on the same water as the side that moved. Scoping one side is the specific decision most likely to produce new cracking within a year.

The reasoning behind that

The first is over-lifting. A house that has been settled for fifteen years has had its plumbing, brickwork, drywall and door frames all take up the moved position. Recovering every inch of that movement asks all of them to move back at once, and some will not. Experienced firms recover most of it and stop, which is a judgment rather than a failure. The second is partial support. Supporting one side while the other continues to ride the seasonal swing increases the difference between them, and difference is what cracks walls. A scope covering one elevation of a house needs a reason beyond cost. The third, less discussed, is plumbing. Lines fixed to the house move when the house moves, and the ones that pass into a basement floor that is not lifted move most, which is why the pre-and-post test belongs in the scope rather than in the argument afterwards. None of these are reasons not to repair a foundation. They are reasons to read the scope and ask what was left out and why.

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