The short answer
Common Causes of Indoor Humidity
Everyday activities like cooking, showering, and drying clothes release moisture into the air. In an apartment building, that moisture accumulates because units share walls and ceilings, limiting natural airflow. Your building's ventilation system may not exchange enough indoor air with outdoor air, especially if it is old or poorly maintained.
Another major cause is water intrusion. A slow leak from a pipe inside a wall, a roof leak, or a damp basement can add moisture to the air without you noticing. Even small amounts of water seeping into drywall or wood can raise humidity levels throughout the building. The local climate, with wet winters and dry summers, can also affect how much moisture lingers indoors.
Ventilation and Airflow Solutions
Improving airflow helps reduce humidity. Use exhaust fans in the kitchen and bathroom while cooking or showering, and leave them running for a few minutes after. Open windows when the outdoor air is drier than indoor air, especially during the dry summer months. If your building has a central HVAC system, make sure filters are clean and vents are not blocked.
In some cases, a dehumidifier can help. A portable unit can remove moisture from a single room, but for whole-building humidity, the pros may use industrial dehumidifiers as part of structural drying. This process pulls moisture from building materials like drywall and wood, helping to lower overall humidity levels and prevent long-term damage.
When to Call Water Damage Pros
If you notice persistent humidity, visible water stains, or a musty odor, it is time to involve local water damage pros. They can perform a water damage inspection to identify the source and extent of moisture. Using moisture mapping, they can create a detailed picture of affected areas without unnecessary demolition.
For severe cases, structural drying and dehumidification may be necessary. This involves using specialized equipment to dry out walls, floors, and ceilings, which helps prevent mold and structural decay. If you live in Redmond, keep your landlord's contact information handy and report any signs of moisture promptly. Acting quickly can reduce the scope of repairs.
- Persistent humidity that does not improve with ventilation
- Visible water stains or discoloration on surfaces
- Musty or moldy smell in any room
- Warped wood, peeling paint, or bubbling wallpaper
- Condensation on windows or pipes
- Unexplained increase in your utility bills
Preventing Future Humidity Issues
Prevention starts with controlling moisture at the source. Use lids on pots while cooking, run the bathroom fan during and after showers, and avoid overwatering houseplants. Hang wet laundry outside or in a well-ventilated area, and wipe down wet surfaces after use. These simple habits reduce the amount of moisture your activities add to the air.
Regular maintenance also helps. Have your building's plumbing and roof inspected periodically, especially after heavy rain or snowmelt. If you spot a leak, report it to your landlord right away. Keeping gutters clean and ensuring proper drainage around the building prevents water from seeping into foundations. For ongoing concerns, a moisture mapping service can track damp areas over time, helping you catch problems early.
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Call Now (425) 407-5186Frequently asked questions
Can a dehumidifier solve a whole-building humidity problem?
A single dehumidifier can help one room, but whole-building humidity often needs a more thorough approach. The pros may use industrial dehumidifiers as part of structural drying to remove moisture from walls and floors. Fixing the source of moisture is the first step.
Is humidity in an apartment building a health concern?
High humidity can encourage mold growth, which may cause respiratory issues or allergic reactions. If you feel unwell or notice mold, see a doctor if symptoms persist. A mold professional can assess and address mold problems safely.
What should I do if my landlord ignores the humidity problem?
Document the issue with photos and notes, and report it in writing. Your local health department may have rules about indoor humidity and mold. Check your lease and local tenant rights. In the meantime, use fans and dehumidifiers to manage the immediate discomfort.