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Does foundation repair really work? — Answered for Phoenix, AZ

The support works. Whether the house stays still is a separate question with a separate answer.

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A downspout extension being laid in a shallow trench carrying water away from a house slab edge, with the ground regraded to fall away from the foundation beside it.

Piers reliably carry load on ground that will carry the house, and that part is well established. What varies is whether whatever moved the house the first time was found, which is what decides whether new symptoms follow a repair.

What a Phoenix repair is checked against

The median house here is worth $381,900, and 343,369 homes here are lived in by the people who own them. A plumbing test and a second set of elevations cost a fraction of the support, and they are the only way to know whether a repair worked: support addresses where the house has already gone, and only the measurement says whether it has stopped. On a house worth that, the cheap half is not the half to skip.

The reasoning behind that

Take the question in two halves. Can a column bearing on competent ground hold up a section of house? Yes, and that is not controversial — it is ordinary structural engineering and it has been done for a very long time. Does installing that support stop the house moving? Not by itself. A pier holds up the part it is under and does nothing about whatever moved the house, and supporting part of a structure while the rest keeps moving can increase the differential, which is how a repair produces new cracking. The repairs that hold up over time pair the support with a finding: what moved the house, established by measurement and a plumbing test rather than assumed, and a second reading afterwards to show the rest has stopped. The second half is the cheap half and the most commonly skipped. When people say foundation repair did not work, the scope is usually what failed rather than the piers.

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