Not every house has a crawl space, and the foundation type here is not assumed. Where one exists, water gathers on the soil or the vapor barrier and rises as moisture into the subfloor and joists above. Once pumping is done, structural drying takes over and keeps the joists on a monitored schedule until they read dry.
What causes water under a house
A broken supply pipe, a drain leak, runoff from heavy rain or a high water table can all put water in a crawl space. Finding the source matters, since a pump will keep running if the water keeps coming. Water that arrives with silt or sewage is treated as contaminated, so the cleanup steps change and the space is disinfected after the pump out.
Working in tight spaces
Crawl spaces are cramped, dark and sometimes contaminated. The crew uses small pumps, protective gear and lights, removes wet insulation that sags against joists and sets compact dehumidifiers that dry the air and the wood.
