By The Roofing Brief Team. Last reviewed: October 2026.
Slate roof vs metal roof cost comes down to roughly $10 to $30 per square foot installed for natural slate against $5 to $16 for metal, per HomeGuide’s slate roof cost guide (April 2023) and metal roof cost guide (November 2025). On a 2,000 square foot roof that is $20,000 to $60,000 for slate versus $10,000 to $32,000 for metal, before any framing work slate may need. Hard slate lasts 75 to 200 years and soft slate 50 to 125 in HomeGuide’s table, against 30 to 80+ years for metal. Slate weighs about 700 to 1,405 pounds per roofing square depending on thickness, while metal weighs roughly 45 to 130 pounds, which is why weight, not looks, settles most of these decisions.
Slate vs metal roof: the short answer
Choose natural slate if you own a historic or high-value home, plan to stay for decades, your roof pitch is at least 4:12 (the IRC R905.6.2 minimum for slate), and your structure can carry 700 to 1,405 pounds per roofing square. Choose metal if you want a long-lasting roof at about half the installed price, need to keep weight down, have a low-slope section (standing seam is allowed down to 1/4:12 under IRC R905.10.2), or live where hail and wildfire are real threats. Both are premium systems that outlast asphalt shingles by decades, so the comparison is about weight, budget, and how long the roof needs to serve.
What is a natural slate roof?
A natural slate roof uses thin, split tiles of metamorphic stone quarried mostly in Vermont, Pennsylvania, Virginia, and parts of Europe. Each tile is nailed individually to solid decking: IRC section R905.6 requires solidly sheathed roofs, slate complying with ASTM C406, and two fasteners per slate. ASTM C406 grades slate by expected service life: S1 over 75 years, S2 40 to 75 years, and S3 20 to 40 years, per the National Slate Association’s history of the standard. The tradeoffs are weight, cost, and the shrinking pool of installers trained to lay and repair it correctly.
What is a metal roof?
A metal roof is a system of panels or shingles made from steel, aluminum, copper, or zinc, most often installed as standing seam panels or as stamped metal shingles. Steel and aluminum dominate the residential market because they balance cost and durability. Metal sheds snow, resists fire, and weighs far less than slate or tile: about 45 pounds per square for .032 inch aluminum sheet (calculated from aluminum’s 2.7 g/cm3 density) up to 130 pounds per square for DECRA stone-coated steel per ICC-ES ESR-1754. Quality depends heavily on the metal, its gauge, and the coating, so two metal roofs at very different prices can perform very differently.
Slate vs metal roof comparison table
Natural slate and a typical residential steel or aluminum roof compare as follows at 2026 U.S. installed prices of $10 to $30 versus $5 to $16 per square foot, with the source for each row. For the wider field, see how these stack up against other options in our guide to roofing materials compared by weight, cost, and lifespan.
| Factor | Natural slate | Metal roofing | Source |
|---|---|---|---|
| Installed cost (per sq ft) | $10 to $30 (soft $10 to $20, hard $20 to $30) | $5 to $16 | HomeGuide slate (Apr 2023) and metal (Nov 2025) guides |
| Typical 2,000 sq ft roof | $20,000 to $60,000 | $10,000 to $32,000 | HomeGuide per sq ft ranges x 2,000 |
| Labor only (per sq ft) | $4 to $14 | $4 to $8 | HomeGuide |
| Lifespan | Hard 75 to 200 years; soft 50 to 125 years | 30 to 80+ years | HomeGuide |
| Service-life grade | ASTM C406 S1 (75+ yr), S2 (40 to 75), S3 (20 to 40) | Set by metal, gauge and coating warranty | National Slate Association |
| Weight (per roofing square) | 700 lb (3/16 in) to 1,405 lb (3/8 in) at 3 in headlap | About 45 lb (.032 in aluminum) to 130 lb (DECRA stone-coated steel) | North Country Slate; ESR-1754; calculation |
| Minimum roof slope | 4:12 | 1/4:12 for standing seam; 3:12 for lapped panels without sealant | IRC R905.6.2; IRC R905.10.2 |
| Structural reinforcement | Engineer review if the house never carried slate | Rarely required | National Slate Association |
| Impact / hail | Tiles can crack under sharp impact or foot traffic | UL 2218 Class 4 listings exist (for example DECRA) | DECRA hail page |
| Fire rating | Class A, noncombustible stone | Class A in listed assemblies | ESR-1754 and maker listings |
| Typical repair | $500 to $2,100 (slate repair average) | $300 to $1,500, or $5 to $15 per sq ft | HomeGuide slate and aluminum roofing guides |
Cost: slate vs metal roof
Metal roofing costs about half as much as natural slate up front. HomeGuide’s midpoints are $10.50 per square foot for metal ($5 to $16) and $20 for slate ($10 to $30), with hard slate alone at $20 to $30. On a 2,000 square foot roof, that means about $10,000 to $32,000 for metal against $20,000 to $60,000 for slate. Natural slate material alone runs $600 to $1,600 per square, and metal slate-look shingles run $600 to $1,400 per square installed, per HomeGuide. The gap widens once you add the hidden slate cost: structural work.
Because 1/4 inch slate weighs about 935 pounds per square (9.35 psf) per the National Slate Association, homes that have never carried slate may need reinforcement before installation. HomeGuide prices a structural engineer at $100 to $220 per hour and rafter replacement at $5 to $14 per square foot. Metal roofs rarely trigger this expense because even stone-coated steel weighs 1.3 psf installed (ESR-1754).
Worked example: cost per year of roof life, 2,000 sq ft
| Roof | Installed cost (2,000 sq ft) | Lifespan | Cost per year of life |
|---|---|---|---|
| Soft slate | $20,000 to $40,000 | 50 to 125 years | $160 to $800 |
| Hard slate | $40,000 to $60,000 | 75 to 200 years | $200 to $800 |
| Metal | $10,000 to $32,000 | 30 to 80+ years | $125 to $1,067 |
Inputs are HomeGuide’s per square foot and lifespan ranges; low figures divide the lowest cost by the longest life (soft slate: $20,000 / 125 years = $160) and high figures divide the highest cost by the shortest life ($40,000 / 50 years = $800). Framing work for slate is not included.
Lifespan and durability
Slate outlives metal by a wide margin. HomeGuide puts hard slate at 75 to 200 years and soft slate at 50 to 125 years, while metal roofs last 30 to 80+ years. Measured by cost per year of service, slate can be competitive with metal despite the higher sticker price, as the worked example above shows, provided the building keeps the roof that long and the flashing and fasteners are maintained. Many homes change hands well before either roof wears out, which is worth weighing given how often Americans actually replace their roofs.
Durability splits by failure mode. Slate is inert stone: it will not rust or burn, but individual tiles can crack from a dropped branch, hail, or someone walking the roof, so ask for the ASTM C406 grade (S1 for 75+ years) on the quote. Metal resists impact better, especially at heavier gauges and UL 2218 Class 4 listings, but its performance hinges on the coating and on fasteners and sealants that age faster than the panels. In hail-prone regions, metal generally holds up better; for pure longevity in a stable climate, S1 slate leads.
Weight and structural requirements
Weight is the factor that most often decides slate vs metal, and it is where the two materials are furthest apart. North Country Slate’s thickness table puts natural slate at 700 pounds per square for 3/16 inch slate, 935 for 1/4 inch, and 1,405 for 3/8 inch at a 3 inch headlap; HomeGuide’s shorthand is 8 to 10 pounds per square foot. Metal weighs about 45 to 130 pounds per square, making it one of the lightest options available and a common choice when a structure cannot take extra load.
The National Slate Association says that if a structure never had a slate roof, a licensed structural engineer should evaluate the roof framing and load paths before slate goes on, and it notes these loads can be too great for standard post World War II construction. At HomeGuide’s $100 to $220 per hour, that review is a small cost next to a slate roof. If your framing cannot carry slate and reinforcement is not practical, that alone can settle the decision.
Installation and repairs
Slate installation is slow and specialized: HomeGuide puts slate labor at $4 to $14 per square foot, contractor rates at $50 to $100 per hour, and installation at 6 to 7 days for an average home. Under IRC Table R905.6.5, slate needs a 4 inch headlap on slopes from 4:12 to under 8:12, 3 inches from 8:12 to under 20:12, and 2 inches at 20:12 and steeper, and valley flashing must be at least 15 inches wide. Metal labor runs $4 to $8 per square foot, though standing seam still rewards experienced crews because seam and flashing detailing drive long-term performance.
For repairs, both are serviceable but in different ways. A cracked slate tile can be swapped individually for $500 to $2,100 on average per HomeGuide, yet matching color decades later can be difficult, so buy an extra square of matching slate at install. Metal roof repairs run $5 to $15 per square foot or $300 to $1,500 on average per HomeGuide’s aluminum roofing guide, and usually mean replacing a panel or shingle and maintaining sealants and fasteners.
Which roof should you choose? A decision framework
Choose slate if your framing can carry 700 to 1,405 pounds per square, your pitch is 4:12 or steeper, and you plan to stay long enough to use a 75+ year S1 roof. Choose metal if budget, low weight, low slope, or hail and wildfire resistance rank higher, or if you may sell before a roof wears out. The steps below turn those priorities into a defensible decision, and our roof material calculator that ranks asphalt, metal, tile, and slate by budget and lifespan can sanity-check the numbers before you commit.
| If your home has | Then | Rule source |
|---|---|---|
| Roof pitch under 4:12 | Metal; slate is not permitted | IRC R905.6.2 |
| Pitch from 1/4:12 to under 3:12 | Standing seam metal; lapped exposed-fastener panels need 3:12 without sealant | IRC R905.10.2 |
| Framing that never carried slate | Licensed structural engineer review before pricing slate | National Slate Association |
| An existing slate roof you want to cover with metal | Tear off first; a recover over slate is not allowed | IRC R908.3.1.1 |
| A budget under $10 per sq ft installed | Metal ($5 to $16); natural slate starts at $10 | HomeGuide |
| Heavy hail exposure | Metal with a UL 2218 Class 4 listing | Maker listings |
| Plans to stay 30+ years on a 4:12+ roof that can carry the load | S1 hard slate; cost per year falls to $200 to $800 | Worked example above |
| A slate look on framing that cannot carry slate | Metal slate-look shingles at $600 to $1,400 per square installed | HomeGuide metal roof guide |
- Check the structure first. If your framing cannot carry 700 to 1,405 pounds per square and reinforcement is impractical or costly, metal is the realistic choice. Get an engineer assessment ($100 to $220 per hour per HomeGuide) before pricing slate.
- Weigh how long you will own the home. If you plan to stay 30 years or more, or want a roof that outlives you, slate’s lifespan may justify its cost. For a shorter horizon, metal often returns more of its value.
- Match the roof to your climate. In heavy hail or wildfire zones, metal with a UL 2218 Class 4 listing and a Class A assembly is the stronger argument. In stable climates, slate’s 75 to 200 year hard-slate life shines.
- Set the real budget. Add any structural work (rafter replacement runs $5 to $14 per square foot per HomeGuide) to slate’s quote before comparing. If slate plus reinforcement stretches the budget, a heavier-gauge metal or a metal-shingle product that mimics slate may deliver much of the look for less.
- Respect the home’s style. In a local historic district, check the preservation commission’s material rules before choosing; outside one, metal at $5 to $16 per square foot fits a wider range of modern and budget-driven projects.
If you want the slate look without the weight or price, a metal slate-look roofing product sits between the two at $600 to $1,400 per square installed in HomeGuide’s November 2025 guide.
Slate vs metal roofing: frequently asked questions
Is a slate roof better than a metal roof?
Slate is better for lifespan: hard slate lasts 75 to 200 years per HomeGuide, and it suits historic homes, but it costs $10 to $30 per square foot installed and weighs 700 to 1,405 pounds per square. Metal costs $5 to $16 per square foot, weighs about 45 to 130 pounds per square, works down to a 1/4:12 pitch as standing seam, and resists hail better.
Which lasts longer, slate or metal roofing?
Slate lasts longer. HomeGuide rates hard slate at 75 to 200 years and soft slate at 50 to 125 years, and ASTM C406 grade S1 slate carries an expected service life of more than 75 years. Metal roofs last 30 to 80+ years. Both far outlast asphalt shingles, but slate leads on raw lifespan if the building keeps the roof that long and flashing is maintained.
Is slate more expensive than a metal roof?
Yes. Natural slate costs $10 to $30 per square foot installed versus $5 to $16 for metal, per HomeGuide, so a 2,000 square foot roof runs $20,000 to $60,000 in slate versus $10,000 to $32,000 in metal. Slate can also need structural work: rafter replacement runs $5 to $14 per square foot. Over a very long ownership period, slate’s cost per year can narrow the gap.
Does a slate roof need extra structural support?
Often, yes. Natural slate weighs about 700 to 1,405 pounds per roofing square depending on thickness, and the National Slate Association says a licensed structural engineer should evaluate any structure that never had a slate roof. Engineers charge $100 to $220 per hour and rafter replacement runs $5 to $14 per square foot, per HomeGuide.
Which is better in hail, slate or metal?
Metal generally performs better in hail, especially at heavier gauges and with a UL 2218 Class 4 listing, the top impact class. Slate is durable stone but individual tiles can crack under sharp impact or foot traffic, and matching replacement tiles later can be difficult. Slate repairs average $500 to $2,100 per HomeGuide.
Can you put a metal roof over a slate roof?
Not under the IRC. Section R908.3.1.1 does not allow a roof recover where the existing roof covering is slate, clay, cement or asbestos-cement tile, so the slate must be removed first. Ask the roofer to price the tear-off, deck repair, and new underlayment as separate line items, and confirm whether your local code has adopted that section.