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How Poor Drainage Causes Mold
Rain and snowmelt that collect near the foundation raise moisture levels in walls and floors. Over time, this creates ideal conditions for mold growth.
Signs of Drainage Problems
- Water pooling near the foundation after rain
- Efflorescence or damp spots on basement walls
- Musty odors in lower levels
- Gutters overflowing during storms
Exterior Fixes
Grading and Gutters
- Slope soil away from the house
- Extend downspouts at least 6 feet
- Keep gutters clean and aligned
Drainage Additions
- Install French drains where needed
- Add gravel or swales to redirect water
- Use window well covers and drainage
Interior Protections
- Use dehumidifiers in below grade spaces
- Seal foundation cracks and joints
- Store items off the floor
Basic Moisture Control
Drainage fixes work best when paired with basic moisture control inside the home.
- Keep gutters and downspouts clear
- Extend downspouts away from the foundation
- Make sure HVAC drain pans and lines flow freely
- Fix plumbing leaks quickly before they saturate materials