It changes where the water hides, which is most of the job. In a slab home, water runs to wall bases and under flooring systems, and the readings that matter are at the floor edges and inside the wall cavities. In a crawl space home, the event continues under the floor: insulation sags with water, joists stay wet on clay that drains slowly, and the rooms above can look recovered while the structure is not. The moisture map is drawn differently for each, and so is the bill.
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