2026-03-20 7 min read
If you live in Cotati, you already know the seasonal rhythm: bone-dry summers followed by a stretch of gray, rainy months where February alone can dump nearly six inches of rain. That wet season is harder on your garage door than most homeowners realize. The hardware, panels, and seals that looked fine in October can be in rough shape come March. and the damage often happens gradually enough that you don't notice until something breaks.
Understanding exactly how moisture attacks your door is the first step to staying ahead of it.
Cotati enjoys a classic Mediterranean climate. warm, dry summers and mild, wet winters. What makes this climate particularly tough on garage doors is the swing between seasons. From June through September, your door hardware bakes in the heat and dries out. Then the rains arrive, humidity climbs into the high 70s by February and March, and those same components are suddenly soaked. That repeated expansion and contraction cycle accelerates wear on every part of your door system.
Coastal fog also rolls in regularly from the Pacific, which sits just 20 miles to the west. That marine layer doesn't just lower morning temperatures. it deposits a fine layer of moisture on metal surfaces overnight, night after night, for months at a time. For homes in Cotati Hills or the Cotati Country neighborhood, where you might have less direct sun exposure on the garage face, this moisture can linger for hours each morning.
Torsion springs, hinges, and rollers are made of metal, which makes them directly susceptible to rust and corrosion. When humidity is consistently high, springs can weaken and snap ahead of their expected lifespan. Rust on tracks causes rough, jerky operation. that grinding sound you hear on cold mornings isn't just the door being stiff, it's corroded metal dragging. If you want to know what warning signs to watch for before a spring actually fails, our post on recognizing when your door needs attention covers the key indicators in detail.
Many of the ranch-style homes and farmhouses on the outskirts of Cotati. and the charming cottages near downtown. were built with wood garage doors that look great but require consistent upkeep. Wood absorbs moisture from the air, causing it to swell. As it dries, it shrinks. That cycle leads to warping, cracked paint, and eventually structural failure of the panels themselves. If you have a wood door, sealing and staining it before winter is not optional. it's essential.
The rubber seal along the bottom of your garage door is your first line of defense against rainwater running across your driveway and into the garage. Humid conditions degrade these seals faster than dry climates do. A seal that's cracked or lifting in one corner can let in surprising amounts of water during a heavy February rain. Check yours at the start of each rainy season and replace it if it doesn't compress flat against the floor when the door closes.
Excess moisture can impact the sensors and logic board of your garage door opener. The safety sensors near the floor of your garage are especially exposed. they sit right where water can pool. Moisture can cause false readings, prevent the door from closing, or trigger the auto-reverse function randomly. During wet months, test your safety sensors monthly by placing a small object in the door's path and confirming it reverses properly.
Rather than waiting for a problem to appear, run through these steps each October before the rains start:
- Lubricate all moving parts with a silicone-based or white lithium lubricant. Avoid WD-40 on springs. it strips protective coatings and invites rust. Focus on hinges, rollers, and the torsion spring shaft. - Inspect the bottom seal. Close the door and check from inside the garage. You should see no daylight along the bottom edge. - Check all panel seams on wood doors for cracking or peeling paint. Touch up with exterior-grade paint or a quality wood sealant. - Clear the weatherstripping around the door's perimeter. Leaves and debris can prevent a tight seal and trap moisture against the frame. - Test the auto-reverse by placing a 2x4 flat on the ground under the door. It should reverse immediately on contact. - Wipe down metal hardware to remove any surface rust that formed over summer. A light coat of rust-inhibiting spray goes a long way.
For a more complete year-round approach, our garage door maintenance guide walks through every component with step-by-step instructions.
Sometimes moisture problems aren't coming from outside. they're building up inside a poorly ventilated garage. Vehicles bring rainwater in. Firewood stored in the garage releases moisture. If your garage lacks wall or ceiling vents, humidity accumulates and never has a chance to escape. Proper garage ventilation helps maintain the balance between inside and outside air, and keeping any ventilation systems clear of debris ensures they actually do their job.
A simple hygrometer. available for around $15 at any hardware store. can tell you if your garage is holding excess humidity. Ideal garage humidity is generally below 60%. If you're consistently above that, a small dehumidifier during winter months can protect your door hardware, your tools, and anything else you store in there.
Some moisture damage is DIY-friendly: replacing a bottom seal, touching up paint, lubricating hinges. Others are not. If you notice rust on your torsion spring, hear loud popping or creaking when the door moves, or see sections of track pulling away from the wall, those are signs that a trained technician needs to look at the system. Never attempt to adjust or remove a torsion spring yourself. they are under enormous tension and can cause serious injury.
Garage Door Company Cotati is familiar with exactly how Cotati's winter weather affects local doors. from the older farmhouse doors on the rural edges of town to the attached garages in Cotati Rancho Adobe. Reach out to schedule a seasonal inspection before problems compound.
Q: How often should I lubricate my garage door during Cotati's rainy season? A: Once at the start of the season (around October) is typically enough if you use a quality lubricant. If your door starts sounding squeaky or rough mid-winter, go ahead and apply another coat to the hinges, rollers, and spring shaft. Don't over-lubricate. excess product attracts dirt and can gum up the tracks.
Q: My garage door is slow to open on cold, foggy mornings. Is that a moisture problem? A: It can be. Cold temperatures thicken lubrication and slow rollers down, but rust on tracks or corroded rollers make it significantly worse. If the door is noticeably sluggish or jerky rather than just slow, have the tracks and rollers inspected. It's also worth checking that your opener's force settings haven't been set too low for the added resistance.
Q: Can I replace the bottom weatherseal myself? A: Yes, for most standard doors this is a manageable DIY project. The seal slides into a channel at the bottom of the door and can be replaced without special tools. Measure the width of your door before buying replacement material, and opt for a flexible rubber or vinyl seal rated for exterior use. If the retainer track itself is bent or rusted, replacement becomes more involved and professional help is worthwhile.