Mold inside Edmonds walls usually starts with rain blowing past windows and siding, a hidden plumbing leak, or winter condensation, and occasionally with coastal flooding near the marina. Moldy drywall and insulation generally come out, the framing is cleaned and dried, and the wall is closed only after the water problem is fixed. Call the number on this page to be connected with a local mold remediation company in Edmonds.
Edmonds conditions that wet walls
Edmonds faces Puget Sound from a downtown valley locals call the bowl, with neighborhoods climbing the slopes around it. West-facing walls take the brunt of storms off the water, and rain driven sideways finds small gaps around window trim, deck ledgers and siding joints. Hillside homes often have a lower level set into the slope, where the back wall stays cool and damp through winter. The waterfront has its own risk. On December 27, 2022, king tide waves crashed over the Edmonds seawall, about a foot and a half of water covered the marina area, and Dayton St. between SR 104 and Railroad Ave. closed with water one to two feet deep in spots. Buildings that took water that day needed wet wallboard removed, not just wiped.
Clean the surface or open the wall?
| Situation | Surface cleaning may be enough | Opening the wall is likely |
|---|---|---|
| Where the mold is | On the paint only, small area | On the back of drywall or in insulation |
| Moisture readings | Dry inside the wall | Wet or elevated behind the surface |
| Drywall condition | Firm, no swelling | Soft, stained through, crumbling at the bottom |
| Water source | Brief condensation, now controlled | Ongoing leak or floodwater |
| Size | Under about 10 square feet | Larger or spreading behind cabinets |
Signs worth checking
- Musty odor that is strongest near one wall or inside a closet
- Paint that blisters or peels below a window
- Baseboards that swell or pull away from the wall
- Drywall that gives when pressed or feels cold and damp
- Stains that grow after a stretch of storms
Timing and the season
The Snohomish County Health Department advises drying water-damaged materials within 24 to 48 hours, and that window matters most from October through April, when nothing dries on its own. Winter is also when condensation shows up on cold walls, so a stain that appears in January and fades in August points to condensation rather than a leak. If walls need to be rebuilt after removal, the City of Edmonds Building Division reviews plans, issues permits and inspects residential work. Renters should know the city's code enforcement office states it does not get involved in tenant-landlord disputes, so written notice to the landlord under Washington law is the main path.
Mold in Walls & Drywall questions in Edmonds
Can mold grow inside a wall when the painted side looks fine?
Why does the same outside wall get moldy every winter?
Floodwater soaked the lower part of my walls. What has to come out?
Who can I ask about health concerns from mold in my walls?
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