Overview
After a Bay Area winter of atmospheric rivers and steady rain, spring is the ideal time to check your home for the moisture problems the wet season may have started - before they turn into mold or structural damage over the warmer months. Here's a focused post-winter checklist. (General prevention guidance.)
Why spring specifically?
Winter storms stress roofs, gutters, foundations, and seals, and they can leave moisture lingering in places you won't notice until it's a problem. Spring's drier, milder weather is the perfect window to inspect, dry out, and repair - and to catch early mold before summer warmth helps it spread. (Local context: why San Jose's climate makes mold common.)
Roof & gutters
- [ ] Inspect the roof for storm damage - lifted, cracked, or missing shingles, and damaged flashing.
- [ ] Check for ceiling stains that appeared or grew over winter (see ceiling water stains).
- [ ] Clean gutters and downspouts of winter debris and confirm water drains away from the foundation.
Foundation & exterior
- [ ] Look for cracks or signs of water pooling near the foundation.
- [ ] Confirm grading still slopes away from the home after winter saturation.
- [ ] Check crawl spaces and basements for dampness, standing water, or musty odor.
Inside the home - moisture & mold watch
- [ ] Check under sinks, around tubs/showers, and near windows for moisture or new stains from winter.
- [ ] Sniff for musty odors in closets, bathrooms, and low-ventilation rooms - the earliest mold sign (see what causes musty smells).
- [ ] Inspect any area that had a winter leak to confirm it dried fully - incomplete winter drying is a classic spring mold source.
- [ ] Test bathroom and kitchen exhaust fans; run them to manage humidity as it warms.
Plumbing & appliances (head into summer ready)
- [ ] Check washer hoses and water heater ahead of heavier summer use (ties into appliance prevention).
- [ ] Confirm your main shut-off valve works.
If you find moisture or mold
Don't wait it out hoping it dries - lingering winter moisture is exactly what feeds mold as temperatures rise. A professional can confirm whether materials are still wet and whether mold has started, then dry and remediate as needed.
The takeaway
Spring maintenance is about catching what winter started. Twenty minutes of inspection now - roof, gutters, foundation, and a musty-smell sweep indoors - prevents the moisture and mold problems that otherwise surface over summer.