The short answer
Find the Moisture Source
The first step is to locate where the dampness is coming from. Check for visible water stains on the ceiling, walls, or floor. Look at the windows for condensation, feel the walls for cold spots, and inspect the closet for damp clothing or shoes. A musty smell often points to a slow leak from a pipe or roof.
If you don't see obvious signs, the moisture could be behind the drywall or under the flooring. Use your nose to follow the strongest odor, and consider a moisture meter if you have one. In a climate with wet winters and dry summers, indoor humidity can build up, so also check the room's ventilation and airflow.
Dry the Room Thoroughly
Once you find the damp material, dry it out as quickly as possible. Open windows if the outdoor air is drier than the indoor air, and use fans to keep air moving. A dehumidifier can help pull moisture from the air, especially in a small room. Remove wet carpet, padding, or drywall that can't be dried within a day or two.
If the water damage is extensive, you may need to remove soaked materials and set up structural drying equipment. This involves using industrial dehumidifiers and air movers to dry out walls and floors from the inside. You can do some of this yourself, but for large areas, the pros often handle the drying process.
Clean Mold and Prevent Return
After drying, clean any visible mold with a mild detergent and water. For porous materials like drywall or wood, mold can penetrate deep, so you may need to cut out and replace affected sections. Wear gloves and a mask to avoid breathing in spores. If you or your child have allergies or asthma, see a doctor if symptoms worsen.
To keep the smell from coming back, reduce humidity in the room. Use a dehumidifier during damp months, and make sure the room has good air circulation. Fix any leaks in the roof, walls, or pipes promptly. If you rent, talk to your landlord about repairs. If the problem is from a hidden leak, a leak detection service can help pinpoint the source.
When to Call the Pros
You can handle a small, visible mold spot on your own, but a persistent smell or large water damage needs professional help. If you suspect water is trapped inside walls or under floors, a water damage inspection can identify the extent. The pros use moisture mapping and leak detection tools to find hidden water without tearing everything apart.
For severe cases, such as after a flood or a burst pipe, you may need emergency water extraction and structural drying. These services remove standing water and dry out the building materials completely. The pros can also remove water-damaged flooring and repair drywall. The cost depends on the extent of damage and the methods used, so ask for details before work begins.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
Is the mold smell dangerous for my child?
Mold spores can irritate the airways, especially in children with allergies or asthma. A musty smell indicates active mold growth, which can release spores into the air. If your child has breathing problems or a persistent cough, see a doctor. Remove the mold source to reduce exposure.
Can I just paint over the moldy wall?
Painting over mold does not solve the problem. The mold will continue to grow underneath and can eventually soak through the paint. You need to remove the mold and address the moisture source first. If the drywall is deeply affected, you may need to cut out and replace that section.
What if I can't find the source of the moisture?
Sometimes the leak is hidden behind walls or under floors. A professional inspection using moisture meters and thermal cameras can locate the damp area without major demolition. If you suspect a pipe leak, a leak detection service can pinpoint the problem. Finding the source is key to stopping the smell permanently.