By The Roofing Brief Team. Last reviewed: October 2026.
Yes, zinc is cheaper than copper, both as a metal and as a roof. The USGS Mineral Commodity Summaries 2026 put the 2025 average North American zinc price at $1.49 per pound, against $4.80 per pound for COMEX copper in the USGS copper summary, so copper cost about 3.2 times as much per pound. Installed, HomeGuide prices a zinc roof at $10 to $20 per square foot and a copper roof at $13 to $30, and This Old House prices copper from $11 (shingles) to $35 (flat seam). Zinc is also lighter (7.2 g/cm³ vs 8.89 to 8.94 for copper) and softer, and both metals are rated for roughly a century of service when detailed correctly.
Copper vs zinc roof at a glance
Copper and zinc are the two classic patina-forming roofing metals. The table sets them side by side with a source for every row: metal price from USGS, installed cost from HomeGuide and This Old House, sheet data from the Copper Development Association design handbook, the RHEINZINK-CLASSIC material data sheet and the VMZINC general technical recommendations (March 2024).
| Factor | Copper roofing | Zinc roofing | Source |
|---|---|---|---|
| Metal price, 2025 average | $4.80 per lb (COMEX); $4.40 (LME) | $1.49 per lb (North American); $1.30 (LME) | USGS MCS 2026 |
| Installed cost | $13 to $30 per sq ft (HomeGuide); $11 to $35 (This Old House) | $10 to $20 per sq ft | HomeGuide; This Old House |
| Standing seam installed | $28 to $31 per sq ft | Sheets $6 to $10 per sq ft material plus $5 to $10 labor | This Old House; HomeGuide |
| Typical sheet | 16 oz: 0.0216 in (0.549 mm), 1.00 lb per sq ft; 20 oz: 0.0270 in, 1.25 lb | 0.70 mm standard, 0.80 mm for long panels or exposed sites | CDA Table 1.2B; VMZINC |
| Density | Specific gravity 8.89 to 8.94 | 7.2 g/cm³ (VMZINC uses 7.18) | CDA Table 1.1A; RHEINZINK |
| Strength | Tensile 32,000 psi min., yield 20,000 psi min. (cold rolled) | Tensile at least 150 N/mm² (about 21,800 psi), yield at least 100 N/mm² | CDA; RHEINZINK |
| Thermal expansion | 0.0000098 per °F | 2.2 mm/m per 100 K (about 0.0000122 per °F) | CDA; RHEINZINK |
| Lifespan | 100 years or more | 80 to 100 years or more; VMZINC estimates over 100 years at 0.7 mm | This Old House; HomeGuide; VMZINC |
| Minimum slope (standing seam) | 3:12 standard details, 4:12 with ice and snow; down to 1:12 with special details | 1:12 to vertical (VMZINC PLUS) | CDA Tables 8.1A and 8.1B; VMZINC |
| Key vulnerability | Runoff stains masonry and corrodes zinc and aluminum | Underside moisture, pH below 5 or above 7, copper runoff | CDA; VMZINC |
What is a copper roof?
A copper roof is a sheet copper roof, usually standing seam, batten seam, flat seam or shingles. The Copper Development Association specifies copper by weight: 16 oz copper weighs 1.00 lb per square foot at 0.0216 in thick, and its batten-seam tables call for 16 oz sheets on pans up to 20 in wide and 20 oz above 24 in. Exposed copper weathers from bright metal to brown and then to green patina; This Old House says the patina may form in 10 to 15 years in industrial and seacoast areas and much longer in arid, rural ones.
Copper solders readily, which is why flat-seam and ornamental work at $35 per square foot (This Old House) is usually copper. Two cautions come with it. First, it is the most expensive common roofing metal at $4.80 per pound in 2025 (USGS). Second, the CDA handbook warns that copper-laden runoff leaves green stains on light masonry and can corrode zinc and aluminum below it. Because that same runoff chemistry shapes gutter material choices, our copper vs aluminum gutters comparison is a useful companion read. For how copper fits among roofing metals, see our primer on what metal roofs are made of, and our dedicated copper roofing guide for a deeper single-material breakdown.
What is a zinc roof?
A zinc roof is made from titanium-zinc alloy sheet, most often standing seam or flat-lock panels. RHEINZINK-CLASSIC is 99.995% zinc with 0.10 to 0.18% copper and 0.06 to 0.12% titanium, meets ASTM B69-21 Type 1, and lists “self-healing of scratch marks” as its blue-gray zinc carbonate patina forms. VMZINC puts today’s atmospheric corrosion rate at about 1 µm per year, which is how a 0.7 mm panel reaches its estimated life of over a hundred years.
Zinc forms easily, but RHEINZINK says to warm it before bending below 10°C (50°F), and its minimum bending radius is 1.75 mm. Its main sensitivities are on the back side and at points of contact. VMZINC states that bare zinc can only go on vented open-gap softwood boarding; every other roof build-up needs VMZINC PLUS, which carries a 60 µm underside coating against white rust. HomeGuide also notes zinc is not recommended in coastal salt exposure. Our zinc roof guide covers cost, lifespan, and detailing in more depth.
Copper vs zinc roof: cost compared
Copper is the more expensive metal on every source we checked. HomeGuide puts an installed zinc roof at $10 to $20 per square foot, or $15,000 to $50,000 on average, with zinc standing seam sheets at $6 to $10 per square foot for material and labor at $5 to $10. The same HomeGuide page prices copper at $13 to $30 installed. This Old House breaks copper down by system: shingles $11 to $21, tiles $17 to $28, panels $19 to $28, batten seam $22, standing seam $28 to $31 and flat seam $35 per square foot, and $16,000 to $52,000 for a 1,500 sq ft roof.
Is zinc cheaper than copper per pound and per square foot? Worked example
| Step | Copper (16 oz sheet) | Zinc (0.70 mm sheet) | Source |
|---|---|---|---|
| Sheet weight per sq ft | 1.00 lb | 0.70 mm x 7.2 g/cm³ = 5.04 kg/m², about 1.03 lb | CDA; RHEINZINK; our arithmetic |
| 2025 metal price per lb | $4.80 | $1.49 | USGS MCS 2026 |
| Raw metal value per sq ft of roof | About $4.80 | About $1.54 | Our arithmetic |
| Raw metal for a 2,000 sq ft roof (before seams, waste and fabrication) | About $9,600 | About $3,080 | Our arithmetic |
| Installed range for 2,000 sq ft | $26,000 to $60,000 (HomeGuide $13 to $30) | $20,000 to $40,000 (HomeGuide $10 to $20) | HomeGuide |
The worked example shows why the installed gap is narrower than the metal gap. Copper metal costs about 3.2 times zinc per pound, and the two sheets weigh about the same per square foot because zinc is used thicker (0.70 mm vs 0.549 mm). But HomeGuide puts labor at about 50% of a zinc roof, and fabrication, seaming and underlayment add the same kind of cost to both, so the installed ranges overlap between $13 and $20 per square foot.
Both metals move with commodity markets. USGS projected the 2025 COMEX copper average at a record $4.80 per pound, 14% above $4.22 in 2024, and attributed the rise mainly to uncertainty over tariffs on U.S. copper imports; the LME zinc cash price was projected up 3%. Import duties and supply pressures feed into finished panel costs, a dynamic we track in the Metal Roofing Tariff and Import Exposure Report. Lock panel pricing in writing with a date, since a copper bid can move with the metal.
Which lasts longer, copper or zinc?
Published service lives overlap. This Old House gives copper 100 years or more, while one This Old House contractor quoted on the same page estimates about 75 years. HomeGuide gives zinc 80 to 100 years or more, and VMZINC estimates over 100 years for 0.7 mm zinc at a 1 µm per year corrosion rate. Zinc reaches that range only with a vented or back-coated underside and no contact with incompatible materials. For how these premium metals stack up against other long-life roofs, see our slate vs metal roof comparison.
Copper’s longevity assumes runoff staining and galvanic pairing are managed. When those go wrong, our guide to copper roof repair shows how each problem gets fixed. Zinc’s life shortens where moisture and air are trapped against its back face: VMZINC explains that limited air contact on the underside induces white rust. Because both patinas evolve, the way each roof reflects and sheds heat changes over time, a factor we quantify for many materials in the Roofing Solar Reflectance and SRI Reference.
Durability, patina, and weather resistance
Copper resists corrosion through a stable patina; the CDA calls it a noble metal that reaches “weathering equilibrium”. Zinc is corrosion-resistant on its exposed face, where VMZINC estimates over 100 years for a 0.7 mm panel, and self-heals minor scratches, but VMZINC lists products with a pH below 5 or above 7 as incompatible. That difference, cost and staining for copper versus contact and ventilation for zinc, is the core durability trade-off.
- Patina behavior: Copper goes brown, then green, in 10 to 15 years in seacoast and industrial air per This Old House; zinc forms a blue-gray zinc carbonate patina and self-heals minor scratches per RHEINZINK.
- Runoff and staining: Copper runoff leaves green copper-salt stains on masonry and light surfaces, per the CDA handbook. HomeGuide describes zinc runoff as contaminant-free and suitable for rainwater collection.
- Galvanic compatibility: VMZINC states that copper in contact with zinc in the presence of water corrodes the zinc, and that copper runoff onto zinc “must be avoided under all circumstances”.
- Underside moisture: Bare VMZINC is limited to vented open-gap softwood boarding; other build-ups need the 60 µm back-coated VMZINC PLUS.
- Acidic exposure: VMZINC lists all woods below pH 5, including oak, larch, chestnut, red cedar, white cedar, Douglas fir, mortar, building paper, bituminous membranes and acidic brick cleaners as incompatible with zinc.
On sustainability the two are close. VMZINC states 95% of old rolled zinc is recovered, and copper’s 2025 price of $4.80 per pound (USGS) keeps its scrap value high. Both carry a strong lifecycle story relative to tear-off shingles, a topic we cover in the roofing embodied carbon breakdown.
Installation differences that matter
Both metals are usually installed as standing seam or flat-lock systems, but the slope and substrate rules differ. The CDA recommends at least 3:12 for copper standing seam with standard details (4:12 in ice, snow or heavy rain), while VMZINC rates its standing seam from 1:12 to vertical with panels up to 30 ft without expansion steps. If you are weighing panel systems more broadly, our standing seam vs exposed fastener metal roof guide explains how the attachment method affects cost and upkeep.
- Ventilate or back-coat zinc: Use VMZINC PLUS on the Delta VMZINC structured membrane (3/8 in HDPE), or bare zinc only on vented open-gap softwood boarding.
- Use a slip sheet under copper: The CDA calls for rosin-sized building paper between copper and the substrate, but building paper is on VMZINC’s incompatible list for zinc.
- Plan copper runoff: Route water so it does not drain onto zinc, aluminum or light masonry, per the CDA and VMZINC.
- Size for expansion: Zinc expands about 2.2 mm per meter per 100 K (RHEINZINK), about 25% more than copper’s 0.0000098 per °F (CDA), and HomeGuide notes zinc buckles if clips block that movement.
- Isolate from acidic substrates: Keep zinc off oak, cedar, Douglas fir and mortar, and warm it before bending below 10°C (RHEINZINK).
Panel profile drives cost on both metals. This Old House prices copper flat seam at $35 per square foot against $28 to $31 for standing seam, and HomeGuide says zinc shingles install about 20% cheaper in labor than zinc panels. For how profile choices affect a metal roof, our comparison of standing seam vs corrugated metal covers the trade-offs.
Pros and cons
Each metal trades one strength for another. Copper buys a 100-year-plus reputation and solderable detailing at $13 to $35 per square foot installed. Zinc buys a lower $10 to $20 installed price, lighter sheet and a 1:12 minimum slope, at the cost of stricter ventilation and contact rules.
| Copper | Zinc | |
|---|---|---|
| Pros | 100 years or more (This Old House), solders readily, high scrap value at $4.80/lb (USGS 2025) | $10 to $20 per sq ft installed, self-healing patina, 7.2 g/cm³ density, standing seam to 1:12 |
| Cons | Highest cost, runoff stains masonry and corrodes zinc and aluminum, price moved 14% in 2025 | Needs vented or back-coated underside, incompatible with copper, oak, cedar and mortar, not advised in coastal salt (HomeGuide) |
Which should you choose?
Start with budget and design intent, then check the slope, substrate and neighboring materials against the thresholds below.
| If your project has | Choose | Threshold or rule |
|---|---|---|
| A budget under about $20 per sq ft installed | Zinc | HomeGuide: zinc $10 to $20, copper $13 to $30 |
| A standing seam roof below 3:12 | Zinc, or copper only with CDA special details | VMZINC: 1:12 minimum; CDA: 3:12 standard, 1:12 with special details |
| Existing copper above, or copper flashing that drains onto the new roof | Copper | VMZINC: copper runoff onto zinc must be avoided under all circumstances |
| Oak, cedar or Douglas fir trim, or mortar in contact with the roof | Copper, or isolate the zinc | VMZINC incompatible list: woods with pH below 5, mortar |
| A deck that cannot be vented underneath | Copper, or VMZINC PLUS with its 60 µm back coating | VMZINC: bare zinc only on vented open-gap softwood boarding |
| Light stone or painted surfaces below the eaves | Zinc, or route copper runoff away | CDA: copper salts leave green stains |
| Seacoast salt exposure | Copper | HomeGuide: zinc not recommended where salt can damage it |
| Domes, curves or soldered flat seams | Copper for soldered flat seam; either for curves | This Old House flat seam $35 per sq ft; RHEINZINK minimum bend radius 1.75 mm |
In many projects the deciding number is the installed price: copper at $13 to $30 per square foot against zinc at $10 to $20 (HomeGuide). After that, the detailing rules above, ventilation for zinc and runoff and galvanic separation for both, decide whether either metal reaches its 80 to 100-plus year rating.
Copper vs zinc roofing: frequently asked questions
Is a copper or zinc roof better?
Neither wins in every case. Copper costs more, $13 to $30 per square foot installed per HomeGuide, solders readily and is rated for 100 years or more by This Old House. Zinc costs $10 to $20, is lighter and runs to a 1:12 slope, but needs a vented or back-coated underside and must be kept away from copper runoff, oak, cedar and mortar.
Is a zinc roof cheaper than a copper roof?
Yes. HomeGuide puts an installed zinc roof at $10 to $20 per square foot and copper at $13 to $30, and This Old House puts copper at $11 to $35 depending on the system. As metals, USGS reports 2025 averages of $1.49 per pound for zinc and $4.80 for copper.
Which lasts longer, a copper or zinc roof?
The ranges overlap. This Old House says a copper roof lasts 100 years or more, HomeGuide puts zinc at 80 to 100 years or more, and VMZINC estimates over 100 years for 0.7 mm zinc at a corrosion rate of about 1 µm per year. Zinc reaches that range only with a vented or back-coated underside.
Can you put copper and zinc together on a roof?
No. VMZINC states that copper in contact with zinc in the presence of water causes galvanic corrosion of the zinc, and that copper runoff onto zinc must be avoided under all circumstances. If both metals appear on one building, keep them physically separated and route copper water away from any zinc below, or the zinc may not reach its 80 to 100 year rating.
Do copper and zinc roofs both develop a patina?
Yes. Copper turns brown and then green, which This Old House says can take 10 to 15 years in industrial and seacoast areas. Zinc forms a blue-gray zinc carbonate patina that RHEINZINK says self-heals minor scratches. In both cases the patina is protective, not a sign of failure.
Does a zinc roof need ventilation underneath?
Yes, unless the zinc is back-coated. VMZINC allows bare zinc only on vented open-gap softwood boarding, because limited air at the back face causes white rust; other build-ups need VMZINC PLUS with a 60 µm underside coating. Keep zinc off oak, cedar, Douglas fir, mortar and bituminous membranes.