The short answer
Where the Smell Comes From
Mold needs moisture, warmth, and a food source like drywall, wood, or carpet. In an office, that moisture often comes from slow leaks behind walls, under sinks, or around windows. Condensation on air conditioning lines is another frequent culprit, especially in warmer months.
The smell itself is caused by microbial volatile organic compounds, or MVOCs, that mold releases as it grows. Even a small hidden colony can make a room smell musty. The odor can spread through shared ventilation, so the source may not be in the room where you notice it.
Check the Usual Suspects
Start by looking for visible water stains on ceilings, walls, or floors. Check around restrooms, break rooms, and any area with plumbing. Feel the carpet near exterior doors and windows for dampness. Also inspect the HVAC system, including drip pans and filters, since mold often grows there.
If you have a flat roof, inspect it for pooling water or damaged seams. Wet winters can stress roofing materials, so check for signs of wear after heavy rain. If you cannot find the source, local water damage pros can use moisture meters and thermal imaging to locate hidden dampness without tearing into walls.
- Check ceiling tiles for stains or sagging
- Look under sinks and around toilets for drips
- Feel carpet near windows and doors for dampness
- Inspect HVAC filters and drip pans
- Look for peeling paint or bubbling wallpaper
- Notice any musty smell near vents or ducts
Why You Should Act Quickly
Mold can spread within 24 to 48 hours once moisture is present. The longer the source stays wet, the larger the colony grows and the harder it is to remove. Mold can also damage building materials, leading to costly repairs if left unchecked.
Beyond structural concerns, mold can affect indoor air quality. Some people may develop headaches, sneezing, or respiratory irritation. If you or your coworkers feel unwell, see a doctor. Addressing the moisture problem early helps keep the situation manageable and protects the building.
What the Pros Usually Do
When you call in water damage professionals, they typically start by finding the moisture source using tools like moisture meters and borescopes. Then they contain the affected area to prevent spores from spreading. Depending on the situation, they may remove wet materials like drywall or carpet.
After removal, the pros set up drying equipment such as dehumidifiers and air movers to reduce humidity. They may also apply antimicrobial treatments to surfaces. In some cases, they recommend replacing porous materials that cannot be fully dried or cleaned. The goal is to eliminate the moisture and the mold.
- Locate the moisture source
- Contain the affected area
- Remove wet or moldy materials
- Dry the structure with dehumidifiers
- Clean and treat surfaces
- Advise on repairs or replacement
Preventing Future Mold Smells
Once the mold is gone, keep humidity levels in the building between 30 and 50 percent. Fix any leaks in the roof, plumbing, or windows as soon as they appear. Make sure the HVAC system is maintained and that condensate lines drain properly.
Regular inspections can catch problems early. Walk through the office after heavy rain or at the end of the workday to check for damp spots. The wet season can be a good time to schedule a moisture check, especially if you have had issues before. Staying alert helps you avoid a return of that musty odor.
Water damage does not wait
Phones are answered 24/7 for Redmond and nearby communities.
Call Now (425) 407-5186Frequently asked questions
Can I just paint over the mold smell?
Painting over mold does not remove the problem. The mold can continue to grow underneath and the smell may return. You need to address the moisture source and clean or remove the mold before any painting or repairs.
Is mold in an office building a health risk?
Mold can cause allergic reactions, asthma flare-ups, and respiratory irritation in some people. If you or coworkers experience symptoms, consult a doctor. The building owner should address the moisture problem promptly to reduce exposure.
Will my insurance cover mold damage in the office?
Policies vary, and your insurer decides what is covered. Some policies cover mold if it results from a sudden water event, like a pipe burst, but not from long-term neglect. Check your policy and talk to your insurance company about your specific situation.