1 If there are water infiltrationsA water or humidity infiltration occurs when water slowly and discreetly enters a place where it shouldn’t be, such as inside the walls, ceiling, or floor of a building. This can happen due to rain, a leak, or a waterproofing problem. Over time, it can cause damage such as stains, mould, or even weaken the building’s structure. due to a waterproofing issueNot watertight: This means that an element (such as a wall, roof, or window) does not properly block water or air. It allows humidity or drafts to pass through. with the roof, walls, windows, or through pipes, rainwater drainage, or the heating system — whether the problem is within the dwelling or in another apartment.

2 If there is rising humidityRising humidity: This is when water from the ground rises into the walls, like a sponge soaking up water upwards. It makes the walls damp from their base. in the walls or floors.

If there is permanent condensationCondensation: This is when water vapour in the air turns into droplets upon contact with a cold surface (like a window or wall). This often occurs in poorly ventilated rooms. that is related the how the building is constructed, even when it is being used correctly. This means the dwelling is not overcrowded, the amount of humidity produced is normal for the type of room, and the ventilation is functioning properly to remove it.