1. The Roof and Flashing: Your First Line of Defense
Months of intense California UV exposure can bake roofing materials, making them brittle right before the rain tests them.
- What to look out for: Cracked, curled, or missing shingles and tiles; sagging rooflines; and deteriorated flashing (the metal strips sealing the joints around chimneys, skylights, vents, and roof valleys). Also check pipe boots, the rubber seals around plumbing vents which frequently dry-rot in the summer sun.
- What to do: From the ground (using binoculars) or safely from a ladder, scan your roof for obvious damage. If your roof is over 10 years old or you notice worn seals, schedule a professional roofer to re-seal laps and replace cracked boots while the decking is still dry.
2. Gutters, Downspouts, and Yard Drains
When a gutter backs up during a downpour, water has nowhere to go except under your eaves or straight down against your foundation.
- What to look out for: Gutters packed with dry leaves, pine needles, or roof granules; sagging gutter sections that hold standing water; downspouts that dump water right at the base of your walls; and clogged patio, driveway, or side-yard area drains.
- What to do: Clear all debris from gutters and flush them with a garden hose to make sure water flows freely to the downspouts. Add downspout extensions so water discharges at least 5 to 10 feet away from your foundation. Pull the grates off yard and driveway drains, scoop out sediment, and run a hose into them to verify they aren't blocked by tree roots.
3. Property Grading and Stucco Clearance
Where water goes once it hits the ground is just as important as keeping it off your roof.
- What to look out for: Soil, mulch, or patio pavers piled up against the base of your exterior walls, as well as low spots in the yard where water pools near the house. On stucco homes, look closely at the weep screed—the metal flashing at the bottom edge of the stucco wall designed to let trapped moisture escape. If soil or mulch covers it, water can wick straight into your interior drywall.
- What to do: Ensure the soil slopes away from your foundation (ideally dropping about 6 inches over the first 10 feet). Pull back any mulch, dirt, or planter beds so there is a clear gap below your weep screed or siding. If you live on a hillside or in a flood-prone neighborhood, pick up sandbags from your local fire station or city yard before a storm is in the forecast.
4. Windows, Doors, and Exterior Openings
Wind-driven rain doesn't need a large hole to get inside; a hairline gap in dried-out sealant is all it takes.
- What to look out for: Cracked, shrinking, or missing caulk around window frames; worn weatherstripping under exterior doors; clogged weep holes at the bottom of sliding glass door and window tracks; and soft or peeling wood trim.
- What to do: Scrape away failing exterior caulk and apply a fresh bead of waterproof silicone or polyurethane sealant. Vacuum out dirt and debris from sliding door tracks so rainwater can drain outward instead of overflowing onto your floors.
5. Trees, Wind Hazards, and Irrigation
California winter storms frequently pair heavy rain with high winds. When soil becomes deeply saturated, tree roots lose their grip, making top-heavy or dead limbs a major hazard.
- What to look out for: Dead branches, limbs overhanging your roof or power lines, leaning fence posts, and broken sprinkler heads.
- What to do: Hire an arborist to thin out heavy canopies and remove deadwood before the wind picks up. Turn off your automatic sprinkler controller (or switch it to rain-delay mode) so you aren't over-saturating soil that is already absorbing rainwater. Finally, secure or store lightweight patio furniture, umbrellas, and trash bins so they don't become airborne in a gust.
6. Crawlspaces, Sump Pumps, and Emergency Prep
Don't forget the parts of your home you rarely visit—and make sure you're ready if the power goes out.
- What to look out for: Blocked crawlspace vents, musty odors, damp insulation, or a sump pump that hasn't been tested since last winter.
- What to do: Clear leaves and overgrown plants away from foundation vents so air can circulate underneath the house. If you have a sump pump, pour a bucket of water into the pit to verify the float switch triggers and pumps water out properly. Locate your main water and electrical shutoffs, keep flashlights and portable phone chargers ready, and take a quick video walkthrough of your home and valuables for your records.
A Quick Weekend Game Plan
If you're short on time, tackle your prep in order of highest impact: clear the gutters and yard drains first, check your roof penetrations and window seals second, and trim back overhanging branches third. A few hours of preventative maintenance now will let you enjoy the sound of rain on the roof without worrying about whats happening inside your walls.