Most basements in the city are finished: a carpeted family room, a bedroom or two, a bath and a utility room, all below grade on drain tile. When water gets in, from a sump pit, a pipe, a window well or a drain, it spreads under the carpet and climbs the drywall before anyone sees it.
Finding the source before the cleanup
The source decides the category. A burst pipe or a water heater is clean water; a sump pit overflow is usually Category 2; a floor drain backup or river water is Category 3. The tech who does the walkthrough checks the pit, the floor drain, the window wells and the walls on the uphill side before the cleanup plan is set.
- Sump pit overflow from a failed pump or a power outage
- Seepage at window wells and cove joints in a thaw
- Supply, water heater or softener failures in the utility room
- Floor drain or basement toilet backups from the sewer
Flood cuts, carpet and what stays
Drywall wicks water upward, so the crew cuts it a little above the wet reading, often 2 feet up, and removes the insulation behind it on exterior walls. Carpet over clean water may be saved; pad usually goes. Built-ins, bar cabinets and bathroom vanities get their toe kicks opened so air reaches the floor below them.
Drying a cold lower level
Poured walls and slabs hold water, and a cold basement slows evaporation. The drying team closes the space, runs LGR dehumidifiers and air movers and adds heat or a desiccant unit when readings stall. Daily readings go into the drying log until the walls and framing match a dry reference.
For flood risk on your own street, the National Weather Service flood safety pages explain what each warning means, and the EPA mold page explains why wet materials need to dry within 24 to 48 hours.