Are you trying to figure out whether asphalt shingles or a metal roof is better for your home — especially in a rainy, tree-covered place like Seattle? Do you want to know which option lasts longer, costs less, and holds up best in our moss-prone, moisture-heavy climate?
At RoofSmart, we help Seattle-area homeowners make smart roofing decisions every day through our SmartMatch Needs Analysis — a process designed to match your budget, your style, and your long-term goals with the right roofing material.
In this article, we’ll break down everything you need to know to confidently choose between asphalt and metal roofs — including their costs, lifespan, maintenance needs, durability, and which performs best in the Pacific Northwest.
What are the different types of asphalt shingles?
- Single ply: A shingle that consists of a thin, flat asphalt mat with granules. These are typically referred to as 3-tab shingles. They are not as common, but they are one of the cheaper options.
- Two-ply: This is known as a laminated architectural shingle, and it is the most common shingle used in the industry. There is a fiberglass sheet with a mixture of limestone and asphalt that creates the mat. It is covered with granules that reflect the sun and the UV from the shingle. Without the granules, the asphalt would crack and break down in the sunlight.
- Three-ply: These are known as high-end, luxury shingles because they usually have a fancier design and are thicker than other asphalt shingles. This shingle is made of the same materials as the two-ply, but it has significantly more asphalt. They are heavier and more expensive than architectural shingles.
What are the different types of metal roofs?
When it comes to metal roofs, there are four elements that you’ll need to consider when choosing your ideal roof:
- The different types of metal
- The different thicknesses of the metal
- The different protective and paint coatings needed on the metal
- The shape of the metal
The most common type of metal used for these panels is steel, followed by aluminum and copper.
Each of these metals is measured differently and has varying ranges.
| Type of Metal | Thickness of the Metal (lowest to highest) | Most Common Metal Thickness |
|---|---|---|
| Steel | 28 gauge, 26 gauge, 24 gauge, and 22 gauge | 24 gauge |
| Aluminum | 0.027 and 0.032 | 0.032 |
| Copper | 16 ounces per foot and 24 ounces per foot | 24 ounces per foot |
Sometimes we will use zinc or stainless steel if the job calls for it, but that is rare.
Paint and protective coatings
- Galvanized base layer: Steel roofing panels require a galvanized base coat to keep them from rusting. This goes on first.
- Paint: Next, the paint is applied. There are a variety of different options depending on the manufacturer you choose. Common colors are black, gray, brown, and green. Paint is added as an aesthetic element (it is not used for protection).
- UV protection clear coat: The final coating is used to protect the metal from deteriorating under the sun’s UV rays. Only steel and aluminum require this coating. The two most common types of coating are SMP (silicone-modified polyester) and PVDF (polyvinylidene fluoride). PVDF offers superior protection against UV rays because it lasts longer.
Shape of the metal panels
The final element to consider when thinking about metal roofs is the shape. There are two main options: standing seam and stamped.
Standing seam metal has vertical ridges running through the panels in straight lines. It’s the most common option. Stamped metal panels imitate the look of other roofing materials like tile, shake, or slate.
This article will focus on standing seam metal because that is the most common style used on homes in the Seattle area.
How Do Asphalt Shingles and Metal Roofs Compare Across 6 Key Factors?
When considering the differences between asphalt shingles and metal roofing, it’s important to know which criteria matter most to you. This section will explore different categories where asphalt shingles and metal roofing compare.
The categories are:
- Cost
- Lifespan of the roof
- Eco-friendliness
- Maintenance and durability
- Repairs
- Best in the Seattle area
A winner will be chosen for each category. This will help you identify how each shingle can meet your roof’s needs.
1.) Which Roofing Option Costs Less?
Winner- Asphalt shingles
A new asphalt roof typically costs around $20,000 to $30,000, whereas a metal roof typically costs $50,000 to $60,000.
Asphalt shingles are typically a more popular option because they are more affordable. If you’re looking for the cheapest way to replace your roof, asphalt shingles can’t be beaten.
These ranges are typical for homes in the greater Seattle area, though costs vary by pitch, size, and permitting.
Wondering how much it would cost to install asphalt shingles or a metal roof on your home? Use our Instant Estimator tool to get a ballpark estimate:
2.) How Long Do Metal Roofs and Asphalt Shingles Last?
Winner- Metal roofs
A metal roof lasts 50+ years, which is about twice as long as the average asphalt shingle (which lasts 20-30 years). So, even though metal roofs cost much more, their value comes from their ability to outlast the average architectural shingle.
3.) Which Roof Type Is Better for the Environment?
Winner- Metal roofs
On that same note, metal roofs are better for the environment because they produce less waste. This is not only because they last a long time but also because they are recyclable.
Asphalt roofs must be replaced more frequently, which is unfortunate because it produces a fair amount of waste. They are not recyclable, so they must be thrown away.
4.) Which Roof Requires Less Maintenance in Seattle’s Climate?
Winner- Metal roofs
The Seattle area is known for rain, humidity, and trees—all of which can ruin asphalt shingle roofs.
If you have asphalt shingles, it’s important to make sure that you’re clearing pine needles and leaves off of them. Otherwise, they will trap moisture and cause the shingles to deteriorate, leading to other issues like leaks and mold.
Asphalt shingles are also susceptible to moss growth if there are leaks or if they are wearing down near the end of their life.
However, metal roofs do not deteriorate because of fallen leaves, and they don’t grow moss. So, they require significantly less maintenance than asphalt shingles.
Additionally, metal roofs are better equipped to handle impacts from hail or falling tree branches, which is something that would damage an asphalt roof.
5.) Which Roof Type Is Easier and Cheaper to Repair?
Winner- Asphalt shingles
Although asphalt roofs are more likely to need repairs because they are less durable, they are much easier and cheaper to repair than a metal roof because asphalt shingles cost less and are more manageable than metal panels.
When repairing a metal roof, you’ll need to replace the entire panel that is damaged. This is expensive, and it makes for a tricky repair because the metal panel must be custom-tailored to fit your roof.
6.) Which Roof Is Best for Homes in the Seattle Area?
Winner- Metal roofs
In a rainy, wooded location like the Greater Seattle area, it is important to consider how each roof holds up under rain, excessive moisture, and falling debris from trees.
Asphalt shingles, when installed right, are meant to be water-resistant for the entirety of their 20- to 30-year life. But, when water pools up and sits on top of them, they wear out faster. Another thing that wears asphalt shingles out faster is when they collect debris from trees.
Metal roofs are not impacted by debris build-up or water pooling on top of them. Though properly installed asphalt shingles are not a bad option, metal roofs are the clear winner in this category because they’re naturally better at withstanding the Seattle environment. What are the pros and cons of asphalt shingles and metal roofs?
What are the pros and cons of asphalt shingles and metal roofs?
To help simplify this comparison, here is a list of pros and cons for both roof types.
Asphalt Shingles:
| Pros | Cons |
|---|---|
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Metal Roofs:
| Pros | Cons |
|---|---|
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When is an asphalt shingle the right fit for me?
Asphalt roofs are good for someone who is looking for the least expensive option to cover their roof. It is a faster, easier process to install asphalt shingles.
Asphalt shingles are a popular option because, compared to other shingle options, their price can’t really be beaten. And, as long as you find a quality roofing contractor that does a good job of installing them, you will have great coverage on your roof.
When is a metal roof the right fit for me?
If you can afford it, a metal roof is always a good option. They last a long time, require little maintenance upkeep, and are very durable. They hold up well in a variety of conditions and are preferable in a rainy climate like we have here in the Seattle area, making it worth the investment.
This is a good option for someone who knows that they will be staying in their house for another 20+ years because it lasts for a long time.
A metal roof can also enhance your home’s curb appeal and offer great coverage for the next homeowner, making it an appealing option for those looking to sell.
Asphalt Shingles vs. Metal Roof: Which roof type is best for me?
At the end of the day, both asphalt shingles and metal roofs can be smart choices — but they serve different needs depending on your priorities. Whether you’re focused on long-term durability or short-term budget, you now have a clear picture of how these two roofing options stack up in Seattle’s rainy, debris-heavy environment.
For many homeowners here in the Pacific Northwest, the biggest deciding factor is cost — and knowing how much you should expect to pay for a roof in the Seattle area is essential before making a final decision.
Your next step is to check out “How Much Does a Roof Cost in 2025? Prices for Seattle Homeowners”, where we break down real price ranges, what impacts the cost, and how to budget based on your roofing choice.
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