The First 48 Hours After Water Damage

Mold can start colonising wet material within a day or two. What you do in the first 48 hours decides how big the job gets.

Mold can begin colonising wet material within 24 to 48 hours. That window is the whole game. What you do in the first two days largely determines whether you are dealing with a drying job or a remediation job — and the difference is often several thousand dollars.

Hour 1: stop the water and make it safe

1. Shut off the source. Main water valve for a plumbing failure; know where yours is before you need it. For a roof or storm intrusion, contain and divert rather than chase.
2. Cut power to affected areas at the breaker if water is anywhere near outlets, cords or the furnace — but do not stand in water to reach the panel. If you cannot reach it safely, call an electrician or the fire department.
3. Watch the ceiling. A bulging, sagging ceiling holding water is a genuine hazard. Stay out from under it.

Hours 1–3: document before you touch anything

Photograph and video everything before you move a single item. Wide shots of each room, close-ups of damage, the source of the water if visible, and affected contents. Insurers pay on evidence. Ten minutes of photography here is worth more than any argument later.

Then call your insurer and open a claim, even if you are not sure you will use it. Opening a claim is not the same as filing one, and most policies have prompt-notification requirements.

Hours 1–6: know what kind of water you're dealing with

• Category 1 — clean water. Supply lines, water heaters, rainwater direct from above. Safe to handle with basic precautions. Materials can often be dried and saved.
• Category 2 — grey water. Washing machine and dishwasher discharge, toilet overflow without solids, sump backup. Contains contaminants. Handle with gloves; some porous materials will not be saveable.
• Category 3 — black water. Sewage, river or storm water that has crossed the ground, or any Category 1 or 2 water left standing more than 48 hours. Treated as contaminated. Porous materials come out — carpet, pad, drywall, insulation. Do not attempt this one yourself.

Important: Category 1 water degrades. Clean water sitting for two days in a warm room is no longer clean water.

Hours 3–24: extract and start drying

• Remove standing water — wet/dry vacuum, pump, mop, whatever you have.
• Pull up wet carpet and, critically, the pad underneath. Pad holds enormous amounts of water and almost never dries in place. It is inexpensive to replace and it is usually what turns a dry-out into a remediation.
• Get wet contents out of the room and up off the floor. Furniture on foil or blocks.
• Move air across wet surfaces with fans, and pull moisture out of the air with a dehumidifier. Both, not either.
• Open cabinet doors, vanity kick panels and closet doors so trapped air can move.
• In summer, keep windows closed and dehumidify. In cool dry weather, open up and ventilate.

What most people get wrong

Drying surfaces instead of cavities. A floor can feel bone dry while the wall cavity behind the base trim, the subfloor under the vinyl, and the insulation inside the wall are all soaked. Household fans move air over surfaces. They do nothing for what is inside the assembly. This is the number one reason DIY dry-outs turn into mold calls six weeks later.

Assuming small means minor. A dishwasher leak that produced a visible puddle the size of a dinner plate can have travelled fifteen feet under the cabinet run.

Waiting to see if it dries on its own. It is drying, slowly, and mold is growing faster than it dries.

When to call a professional immediately

• Any Category 3 water
• More than roughly 100 square feet affected
• Water that has been sitting more than 24 hours
• Water inside walls, ceilings or under flooring
• Anything involving the HVAC system or ductwork
• Any household member with asthma or a compromised immune system

Talk to someone local

Clipper City Mold Inspections works throughout Manitowoc County. If anything here sounds like your house, the inspection and the quote are free — call (920) 555-0142 or send us a message.