Crawlspace Moisture: The Hidden Source of Mold in Northwest Homes
· 5 min read · Mold
Damp crawlspaces are one of the most common causes of mold and musty odors in Washington homes.
Why crawlspaces get wet
Ground moisture, poor drainage, missing vapor barriers, and plumbing leaks all raise humidity under the home.
The stack effect
Air rises through a home, pulling crawlspace air — and any mold spores or odors — into living areas.
Warning signs
Musty smells on the main floor, cupping hardwood, and visible growth on joists are common indicators.
Solutions
Proper vapor barriers, drainage correction, and, where needed, encapsulation and dehumidification keep crawlspaces dry long-term.