The instinct after a flood is to save everything that still looks okay. That instinct is wrong often enough that it is worth slowing down. What survives a flood is decided by two things: the water category and how long the material sat wet before drying started. A towel that got wet from a clean supply line and was dried within a day behaves nothing like the same towel soaked in storm water for three days, even though both are just wet cotton.
The categories are covered in full in our guide on water damage categories and classes, at Water damage categories and classes, explained. The short version that matters here is that clean water (category one) gives materials the best chance, gray water (category two) removes more porous items than it saves, and black water from a sewage backup or storm flood (category three) means porous material that touched it is discarded, not cleaned.
Carpet and pad
Carpet pad is a sponge by design, and it holds water and whatever was in that water against the back of the carpet and the subfloor. Pad that touched category two or three water comes out regardless of how the carpet above it looks. Pad under clean water that was extracted within the first day can sometimes be dried, but that is the exception, not the rule.
Wall to wall carpet reached by clean water and extracted quickly can often be dried and saved. The same carpet under gray or black water, or left wet more than a day or two regardless of category, is usually pulled. A carpet that smells sour after drying was not dried enough, and that smell does not improve with time.
Drywall and insulation
Drywall wicks water upward well past the visible waterline, which is why the cut line on a flood repair is almost always higher than the stain. Drywall that was wet more than about 24 to 48 hours, or that touched gray or black water at all, gets cut out rather than dried in place, because the paper facing holds moisture and supports growth even after the surface feels dry.
Insulation inside the wall cavity is worse than drywall. Fiberglass batts lose their shape once compressed by water and do not regain their insulating value, and cellulose insulation holds water almost indefinitely. Either type that got wet is removed, not dried, no matter the category.
Upholstered furniture and mattresses
Upholstered furniture is cushioning wrapped in fabric, and the cushioning holds water the same way carpet pad does. A sofa or chair reached by clean water and dried within the first day has a chance. Anything reached by gray or black water is discarded, because the inside of the cushion cannot be reached to clean or disinfect it.
Mattresses and box springs follow the same logic and are usually the easiest call in the house. The inner layers cannot be inspected or dried to a verified standard, so a mattress that took on floodwater of any category is treated as a loss rather than something to salvage.
Wood furniture, cabinetry and flooring
Solid wood furniture and cabinetry can often be dried and saved if the water was clean and the exposure was short. Veneer and particleboard pieces, common in lower cost furniture and many kitchen cabinet boxes, swell and delaminate quickly and rarely come back once wet through.
Hardwood flooring can sometimes be dried in place with slow, monitored drying, though cupping is common and refinishing is often needed even on boards that are structurally saved. That process is covered in our guide on hardwood floors after water damage, at Hardwood floors after water damage, cupping and drying. Laminate flooring with a fiberboard core almost never survives, because the core swells permanently on contact with water.
Paper, books and photographs
Paper goods are judged by sentimental or legal value rather than cost. Documents and photographs can sometimes be air dried or frozen to stop further damage and dealt with later, but this only works if they are pulled out within the first day. Left wet longer than that, most paper sticks together and mold takes hold between the pages.
What almost always survives
- Sealed glass, metal and plastic items with no porous surface, once wiped down and disinfected if the water was gray or black.
- Solid wood furniture with a sealed finish, if dried within the first day or two.
- Tile, stone and most sealed concrete floors, which can be cleaned and dried rather than removed.
- Clothing and linens, which can usually be laundered even after black water contact, since fabric alone (unlike cushioned furniture) can be fully washed through.
The 24 to 48 hour window decides most of this
The category sets what is possible, but time decides what happens. A material that could have been dried on day one is often a discard by day three, simply because growth has had time to establish inside it. That is why an estimate written on day one of a flood looks different from the same room assessed a week later, and why acting fast keeps the saveable list longer.
What we do
We sort material on site into what gets dried, what gets removed, and what needs a closer look, and we document that sorting for the insurance file before anything leaves the house. The service page is at Flood Cleanup, and the general water damage process is at Water Damage Restoration.
This article is about Flood Cleanup.