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Plumbing - Repipes
  • October 23, 2025

Best Pipe Materials for Surviving Seattle’s Cold Season

Seattle winters are usually mild compared to the Midwest or East Coast, but when temperatures drop below freezing, pipes can quickly become vulnerable. Every year, homeowners across King County find themselves dealing with frozen pipes, sudden leaks, and costly water damage. The difference between a smooth winter and a plumbing emergency often comes down to the type of piping inside your home.

At Fox Plumbing, Heating & Cooling, we’ve seen firsthand how the right materials can prevent headaches when the weather gets harsh. From older metal pipes to modern flexible solutions, knowing your options can help you make smarter choices for your home and avoid an unexpected burst pipe repair in the middle of a cold snap.

Copper Pipes: Tried and True

Copper has been a standard in home plumbing for decades, and for good reason. It’s strong, reliable, and resistant to corrosion. Copper pipes can handle high pressure, which is why they’re still widely used in many Seattle homes, especially in older neighborhoods. The material doesn’t easily warp under temperature fluctuations, giving it a good track record during cold seasons.

The downside is that copper conducts heat very well. While that’s helpful for hot water delivery, it also means copper loses heat quickly in freezing conditions. If exposed or poorly insulated, copper is prone to freezing. Wrapping copper pipes with insulation is essential for winter survival.

Overall, copper is a solid choice if you maintain it properly. Many homeowners choose to keep copper when doing partial repiping because it blends well with other modern materials and can last 50 years or more.

PEX Pipes: Flexible and Freeze-Resistant

PEX piping is one of the newer stars in the plumbing world, and it’s particularly well-suited for Seattle’s unpredictable winters. Made from cross-linked polyethylene, PEX is flexible, which means it can expand slightly if water freezes inside. Instead of cracking like rigid pipes, PEX bends and then returns to shape once the ice thaws.

That flexibility makes PEX a strong defense against frozen pipe disasters. It’s also easier and faster for professional plumbers to install compared to metal pipes, often lowering labor costs. PEX doesn’t corrode and can snake around tight spaces in crawlspaces and basements, making it ideal for Seattle’s mix of older and newer homes.

The biggest downside is that PEX isn’t UV-resistant, so it shouldn’t be installed outdoors where sunlight can reach it. Inside the home, though, it’s one of the most reliable materials for preventing cold-weather plumbing issues.

PVC Pipes: Affordable, But Limited

PVC, or polyvinyl chloride, is another common piping material you’ll find in many homes, especially in drain, waste, and vent lines. It’s lightweight, inexpensive, and easy to work with. For cold-weather performance, though, PVC doesn’t hold up as well as copper or PEX. It’s rigid and brittle, which means that under freezing conditions it can crack easily.

Still, PVC does have its place. It’s excellent for non-pressurized lines, like drainage systems, where freezing isn’t as big of a concern. It’s also resistant to corrosion and chemicals, which makes it a long-lasting solution for certain parts of the plumbing system.

If you’re considering PVC for water supply in Seattle’s climate, though, it’s usually best to look elsewhere. A frozen pipe in PVC can quickly lead to a break and an unexpected plumbing emergency.

CPVC Pipes: An Upgrade from PVC

Chlorinated polyvinyl chloride, or CPVC, offers some advantages over standard PVC. It’s better at handling both hot and cold water, which makes it suitable for supply lines as well as drainage. It also holds up against freezing slightly better than plain PVC, though it’s still more brittle than copper or PEX.

CPVC is often used in retrofitting projects because it’s compatible with many existing systems. It’s also affordable, making it attractive to homeowners looking for budget-friendly options. However, it’s not as flexible as PEX, and repeated freeze-thaw cycles can eventually weaken it.

If your home already uses CPVC, it’s worth insulating and maintaining it carefully. For new installations in Seattle’s colder spots, though, many professional plumbers still recommend PEX or copper for better long-term performance.

Galvanized Steel Pipes: A Relic of the Past

Many older homes in Seattle and SeaTac still have galvanized steel pipes. Back in the day, these pipes were standard because of their strength and durability. Unfortunately, time has shown that galvanized steel is far from ideal. It’s prone to corrosion, rust buildup, and blockages that reduce water pressure.

When cold weather hits, galvanized steel pipes can freeze more easily than modern materials. Once frozen, they’re at high risk of splitting, leading to a burst pipe that requires emergency plumbing help. Even worse, rusty galvanized pipes can contaminate your water supply.

If you have galvanized steel in your home, it may be time to think about repiping. Switching to copper or PEX not only helps protect your home during winter, it also improves overall water quality and flow.

Choosing the Best Material for Seattle Homes

No single pipe material is perfect for every home. The right choice depends on your house’s age, your budget, and how much exposure your plumbing has to the cold. Here are a few guidelines:

  • PEX: Best for freeze resistance, flexibility, and new installations
  • Copper: Strong and long-lasting if insulated properly
  • CPVC: Decent for retrofits and budget-conscious homeowners
  • PVC: Good for drains but not ideal for water supply lines
  • Galvanized Steel: Outdated and best replaced with modern materials

The most important step is working with knowledgeable Seattle plumbers who can evaluate your home and suggest the best options. Professional guidance ensures your investment pays off for decades to come.

Preventing Winter Damage Beyond Pipe Choice

While picking the right material is crucial, prevention goes beyond piping. Homeowners should think about insulation, temperature control, and routine plumbing maintenance. Even the strongest pipes need backup support during a deep freeze. Consider:

  • Adding insulation around vulnerable pipes in crawlspaces, attics, and basements
  • Installing heat tape or cables for extra protection in exposed areas
  • Keeping indoor temperatures steady, even when you’re away
  • Scheduling seasonal plumbing checkups to spot weak points early

Pairing strong pipe materials with preventive care can save you from frozen pipe repair calls and the stress of dealing with water damage in the middle of winter.

When to Call for Help

Even with the best materials and careful maintenance, things can still go wrong. Seattle’s weather is unpredictable, and a surprise cold front can push any plumbing system to its limits. If you find yourself facing frozen pipes or a sudden leak, don’t wait. Professional plumbers can thaw pipes safely, perform burst pipe repair, or handle emergency plumbing situations before damage spreads.

Fox Plumbing, Heating & Cooling has been helping homeowners across Seattle, Bellevue, Kent, and Mercer Island since 1964. Our team is trained to handle everything from water line repair to full repiping, and we arrive with fully stocked service vans so we can fix the problem right the first time. When your pipes give you trouble, calling in the experts is always the fastest way back to peace of mind.

Dealing With a Burst or Frozen Pipe? Think Outside the Box – Call Fox!

Cold weather can sneak up on all of us, and the last thing you want is to wake up to a flooded kitchen or a burst pipe in the basement. Whether it’s a frozen pipe repair, water line repair, or a full repiping project, Fox Plumbing, Heating & Cooling has the tools, training, and experience to keep your home safe.

We’re proud to be the trusted SeaTac and Seattle plumbers that families have turned to for over 50 years. With upfront pricing, a satisfaction guarantee, and our “Warehouse on Wheels” vans, we’re ready to handle your plumbing emergency the same day you call. Reach out to us at (206) 654-4986, and let’s make sure your home is ready to stand strong through Seattle’s cold season.

Preventing Frozen Pipes: Seattle Homeowner Essentials

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