How to deal with the aftermath of flooding in an apartment: a step-by-step guide and useful tips

Flooding in an apartment means more than just ruined renovations and furniture; it also carries the risk of hidden damage, such as water-soaked structural elements, the deterioration of finishing materials, and the development of persistent odors. The sooner you take action, the smaller the affected area will be—and the better your chances of salvaging your property without incurring major expenses.

Effectively addressing the aftermath involves a series of steps: stopping the source of the water, safely cutting off electricity to the affected areas, removing standing water, assessing the true extent of the damage, and carrying out a drying process with careful humidity monitoring. Below are some guidelines and practical tips to help you manage the cleanup process without making unnecessary mistakes.

Drying and Restoration: How to Avoid Hidden Issues

Once the initial standing water has been removed, the primary goal is to extract moisture from the building structures themselves, rather than just drying the surfaces. If moisture remains trapped in the floor screed, between wall panels, or beneath laminate flooring, it will eventually lead to unpleasant odors, warped surfaces, and the growth of mold or mildew.

How to Properly Dry Out a Space

1. Ensure air circulation: Use fans and keep the area well-ventilated to accelerate evaporation.
2. Use a dehumidifier (if available) and remember to empty the collected condensate regularly.
3. Monitor humidity levels: A household hygrometer will help you track whether the drying process is progressing as it should.
4. Be patient: Hidden layers—especially those beneath floor coverings or in corners—take longer to dry than you might expect.

Important: Materials such as laminate, parquet flooring, and carpeting often trap water in their underlayment.

If a sense of dampness persists after 24–48 hours, the surface covering may need to be partially removed to allow the underlying substrate to dry out.

Walls, ceilings, and finishes: common mistakes

• Do not cover damp walls immediately; applying paint or new wallpaper over a surface that has not yet dried will lead to bubbling and peeling.
• Do not attempt to mask odors with air fresheners or fragrances; these do not address the root cause and only make it more difficult to assess the actual condition of the surface.
• Do not ignore cracks or bulges; these are signs that the layers of plaster or putty have been damaged by moisture.

Mold prevention and sanitization

The risk of mold growth increases significantly within just 24–72 hours under conditions of high humidity and poor air circulation. Pay special attention to corners, areas behind furniture, zones around baseboards, and spots where water may have seeped beneath the flooring.

What to do:

• Remove damp materials that cannot be salvaged (swollen baseboards, water-damaged drywall that has lost its structural integrity, and laminate underlayment).
• Treat surfaces with safe antiseptic agents, following the manufacturer’s instructions.
• After treatment, continue the drying process until the indoor humidity levels have stabilized and returned to normal.

If the affected area is large, a persistent musty odor has developed, or there are signs of mold or microbial growth in hidden cavities, it is advisable to consult professionals specializing in sanitation and drying—including mold removal services — to ensure the problem does not recur.

Quick Checklist: What to Verify Before Cosmetic Repairs

The golden rule is: do not rush to cover up the damage with cosmetic fixes. Prioritize safety, water removal, thorough drying, and humidity control before proceeding with any restoration of finishes. This approach minimizes the risk of having to pay for repairs twice and helps restore the apartment to a livable condition.

Immediate Steps Upon Discovering Water: Cutting Off Electricity, Shutting Down Water Risers, and Documenting the Situation

When you discover water in your apartment, the most critical priority is to quickly mitigate risks to life and property: stop the water flow, eliminate the risk of electric shock, and prevent moisture from spreading further. Any delay increases the extent of the damage and complicates the subsequent restoration process.

Follow a clear, logical sequence: first, ensure safety (address electricity); next, address the water source (shut off risers or valves); and finally, document the situation and notify the relevant parties.

This will help not only to minimize losses but also to properly document claims and compensation requests.

Recommended Steps

1. Ensure safety and cut off the electricity.
   • If there is water near electrical outlets, the distribution board, wiring, or household appliances, do not step into puddles or touch wet surfaces.
   • If possible, cut power to the apartment via the electrical panel by switching off the circuit breakers or the main breaker. If accessing the panel is dangerous due to the presence of water, call emergency services or an electrician.
   • Unplug electrical appliances only after the power has been cut to prevent short circuits.
2. Shut off the water supply (risers and supply lines).
   • Close the shut-off valves at the apartment’s water intake (for both cold and hot water). If the leak is coming from a radiator or the heating system, you will need assistance from the building management or maintenance service, as the shut-off valve may be located on the riser.
   • If the source is not in your apartment (e.g., water coming from above), contact your neighbors immediately and ask them to shut off their water; simultaneously, call emergency services.
   • If the source is unknown (e.g., water leaking from a wall or ceiling), shut off the main intake valves in your apartment, then determine the cause.
3. Contain the water and protect your property.
   • Collect the water (using rags, buckets, a mop, or a squeegee), place containers under leaks, and—if necessary—remove light fixtures or suspended elements where water may be pooling.
   • Clear items from the floor and affected areas; use plastic sheeting or trays, and elevate furniture using supports (such as dry wooden blocks or plastic risers).
   • Open windows to ventilate the space, but avoid strong drafts if it is cold or highly humid outside, as this could worsen the deformation of materials.
4. Document the situation and gather evidence.
   • Take photos and videos: capture wide shots of the rooms, close-ups of the damage (ceiling, walls, floor, appliances), signs of water streaks, the source of the leak, and utility meter readings (if applicable).
   • Ensure your footage clearly shows the location and nature of the damage by including reference points (such as doorways, windows, corners, or furniture).
   • Make brief notes: the time the issue was discovered, the suspected cause, who was present, what measures were taken, and whom you contacted.
5. Notify the responsible parties and complete initial documentation.
   • • Contact emergency services or your property management company; record the service request number and the time of your call.
     • If the flooding originated from a neighbor’s unit, inform them and suggest inspecting the source together.
     • Request an official inspection report (or flood damage report) and ensure that all damages are documented within it.

   If necessary, create a separate list of the damaged property.

In summary: your priority in the first few minutes is to cut off the power, shut off the water supply, and document the situation. Taking these steps reduces the risk of injury, limits further damage, and helps establish a clear record of the circumstances surrounding the flooding.

Once these initial measures are taken, the next steps are to arrange for drying and to assess the extent of the damage. The sooner you stabilize the situation and complete the necessary documentation, the easier it will be to carry out repairs and resolve matters with the party responsible or the property management company.