How to Prevent Frozen Pipes in Seattle – Protect Your Home Before Winter Damage Strikes

Start dripping faucets when outdoor temperatures approach 32 degrees, especially if pipes run through unheated spaces. In Seattle, monitor forecasts for overnight lows near or below freezing. Begin the drip before sunset when temperatures drop. Focus on faucets connected to pipes in crawl spaces, attics, or exterior walls. A slow, steady drip keeps water moving and prevents ice blockage. If wind chill or a multi-day freeze is forecast, start earlier. You can stop once daytime temperatures rise and stay above freezing for several hours.

Wrap and insulate exterior faucets rather than leaving them on a drip. Disconnect hoses first, then shut off the interior valve supplying the hose bib. Drain the exterior line completely. Install an insulated faucet cover or wrap the spigot with foam insulation and weatherproof tape. Dripping outdoor faucets wastes water and can create ice buildup on walkways or foundations. Seattle winters bring freeze-thaw cycles that make ice hazards worse. Proper insulation and shutoff protect the fixture and prevent water waste. Save dripping for interior faucets with vulnerable supply lines.

Run cold water only. The goal is to keep water moving in the supply line. Cold water pipes freeze first because they lack the residual heat from your water heater. Running hot water does not provide extra protection and wastes energy heating water that goes down the drain. In Seattle homes, focus your drip on cold water taps connected to pipes in crawl spaces or exterior walls. If your hot water line runs through the same vulnerable area, a slight drip from the hot side may help, but prioritize cold water.

Do not add rubbing alcohol to your plumbing system. While alcohol lowers the freezing point of water, introducing it into your home's pipes can damage seals, gaskets, and fixtures. It contaminates your water supply and creates health risks. The concentration needed to prevent freezing would require large amounts of alcohol, making it impractical and expensive. Instead, use proper insulation, heat tape, or maintain a drip during freezes. For winterizing vacant properties, use RV antifreeze specifically designed for plumbing systems. Never improvise with household chemicals in your water lines.

Pipes in unheated crawl spaces freeze first in Seattle homes. Next are pipes in exterior walls, attics, and garages. Hose bibs and outdoor faucets are extremely vulnerable. Homes on concrete slab foundations with poor skirting allow cold air under the structure. Older homes in neighborhoods like Ballard or Queen Anne often have minimal crawl space insulation. Pipes near rim joists or in wall cavities against north-facing walls freeze quickly. Any pipe with minimal insulation and exposure to outside air is at risk during Seattle freeze events.

Let it drip if you are home and can monitor it. Turn water off at the main if you are leaving for an extended period during a freeze. Dripping prevents pressure buildup and keeps water moving in vulnerable pipes. If you leave town, shut off the main supply, then open all faucets to drain the system. Leave cabinet doors open and set heat to 55 degrees minimum. For short absences during a Seattle cold snap, a drip is safer and easier. For multi-day trips in freezing weather, turn off and drain the system completely.