Identifying water damage in a house can be important for addressing any underlying issues that may be causing the persistent mildew smell. Here are some signs to look for that may indicate water damage:
Discoloration or stains: Check for any visible signs of discoloration or stains on walls, ceilings, or floors. Water damage can cause yellow or brown stains, water rings, or darker patches.
Peeling or bubbling paint or wallpaper: Moisture can cause paint or wallpaper to peel, bubble, or become warped. Look for any irregularities in the paint or wallpaper in the affected area.
Soft or sagging walls or ceilings: If water has infiltrated the walls or ceilings, they may feel soft or spongy to the touch. In severe cases, they might sag or show signs of structural damage.
Musty or mildew odor: A persistent mildew smell, even after cleaning, can indicate hidden moisture or water damage. Pay attention to areas with the strongest odor.
Water stains or warping on floors: Check for water stains, discoloration, or warping on flooring materials such as hardwood, laminate, or carpet. Cupping or buckling of wooden floorboards can also be a sign of water damage.
Mold growth: While you mentioned not seeing visible mold, it's still worth checking for any signs of mold growth. Look for fuzzy or discolored patches on surfaces or a black or greenish substance in corners, along baseboards, or behind furniture.
Damp or swollen baseboards: Excessive moisture can cause baseboards to become swollen, warped, or discolored. Inspect the baseboards in the area where you're noticing the odor.
Water stains or rust on fixtures: Check sinks, faucets, toilets, or any plumbing fixtures in the room for signs of water stains, rust, or corrosion. These can indicate ongoing water leakage.
If you notice any of these signs, it's advisable to further investigate or consult with a professional. They can help determine the extent of the water damage and identify the source of the problem. In some cases, the cause might be hidden behind walls, under flooring, or in the ceiling, requiring the expertise of a water damage restoration specialist or a professional home inspector.