Title: Painting an Apartment: The Hidden Dangers of Simultaneous Cleaning
When it comes to preparing an entire apartment for painting, the logistics change significantly from a simple one-room job. The real challenge isn't choosing the right cleaning product, but rather planning the cleaning room by room without overwhelming the air with humidity. Attempting to clean an entire apartment on the same day, with windows closed, leads to an extended drying time and potentially poor paint adhesion. Cumulative humidity in an apartment: the trap of simultaneous cleaning.
Title: Painting an Apartment: The Hidden Dangers of Simultaneous Cleaning
You may have noticed foggy windows after a long shower. The same phenomenon occurs when multiple rooms are cleaned the same day. The water used to clean walls evaporates and disperses into the ambient air. In a poorly ventilated space, humidity levels quickly rise. The concrete issue: a wall that feels dry to the touch may still contain residual moisture deep within. Painting over this wall traps the water beneath the paint film. Result: bubbles or flaking paint a few weeks later.
Recent work guides (Chort Bâtiment, Artcamia, published in July 2026) recommend a minimum 24-hour drying period per wall, or 48 hours in winter or humid environments. Active ventilation (large windows open, air circulation between rooms) accelerates the process but does not eliminate it entirely. Divide the job into zones and days.
The most reliable approach is to spread the cleaning over several days. For example, in a T3 apartment:
Day 1: Living room and hallway, often the largest wall surfaces. Windows open during and after cleaning.
Day 2: Bedrooms. Take advantage of the living room already being dry from the previous day.
Day 3: Kitchen and bathroom, the rooms with often the dirtiest and oiliest walls, requiring a more intense cleaning.
This segmentation avoids saturating the air with steam. It also allows you to start sanding and repainting the dry walls in the living room while the bedrooms finish drying.
Adapt the cleaning product to the type of surface in each room. All rooms in an apartment don't have the same dirt buildup. The living room walls accumulate mostly dust. Those in the kitchen bear a greasy film, sometimes invisible. The bathroom combines residual moisture and mineral or mold deposits. Using one cleaning solution for the entire apartment, with the same dosage everywhere, is a frequent mistake. The kitchen and bathroom require a more concentrated degreaser than bedrooms or hallways.
Three common products and their adapted uses:
- Saint-Marc cleaner (or any alkaline equivalent) remains the reference for degreasing kitchen walls.
- Diluted washing soda offers an economical alternative with good degreasing power.
- Black soap is suitable for bedrooms with minimal grime, as it cleans without attacking fragile paints.
- For bare plaster walls, a mild detergent or a solution of baking soda and water is recommended.