Excavation in saturated ground produces spoil that will not go back and readings that do not reflect the dry-season position of the house. Work is commonly paused not for comfort but because the results are worse.

How wet Chicago ground gets

The largest soil mapped here is hydrologic group D, and the fastest of the largest mapped soils takes water in at 0.4 inches an hour. How fast water leaves the ground after rain is the reason scheduling matters more in this trade than it looks like it should: the same excavation is a different job depending on which week it happens in.

The reasoning behind that

Wet ground is the problem, not the rain. Excavated saturated soil loses its structure, comes out as something closer to slurry, and cannot simply be replaced and compacted. That turns a tidy backfill into a spoil-removal job and a settled backfill later. Readings taken in a wet period describe a house at its wettest. Lifting to that position and then watching the ground dry out through summer is a way of building the next problem into the repair. Some work is genuinely weather-independent — interior piers under a roof, bracing set from inside a basement, crawl space framing, injection work in a dry basement. Ask which category your scope falls into rather than assuming the whole job stops. A firm that offers to proceed regardless in heavy rain is worth a question about why. Sometimes there is a good answer; sometimes it is a schedule being protected at the cost of the result.

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