Metal Roofing: Types, Benefits, and Tradeoffs
Metal roofs come as panels, shingles, or tiles. Some panels join at raised seams, called standing seams. Others use fasteners you can see on the roof surface. Makers use steel, aluminum, copper, zinc, or stainless steel. Compare the whole roof, including the covering, base, fasteners, and seals at joints.
How Metal Roofing Is Made
Makers shape coils of metal into roof panels with rollers. They use presses to form some shingles and tiles. On a standing-seam roof, raised joints connect panels next to each other. Some crews use a machine to close those joints. Follow the maker’s rules for fasteners, joints, trim, and roof slope.
Steel roofs may have a zinc or aluminum-zinc coating beneath paint or stone granules. Other metals use different finishes and ways of attachment. Ask about the exact product; metals do not all install or age the same way.
History of Metal Roofing
Builders used copper, lead, and iron roofs on major U.S. buildings in the late 1700s and early 1800s. The National Park Service records a sheet-iron roof from about 1794. It also records an English patent for corrugated iron in 1829 and zinc-coated iron roofing in New York by 1839. Read more in From Asbestos to Zinc and Metals in America’s Historic Buildings.
Benefits of Metal Roofing
- Long life: A well-designed metal roof can last for decades. One independently checked Metal Construction Association study found at least 60 years of life for a specific roof type. It used unpainted aluminum-zinc-coated panels with standing seams on a low slope. That result does not apply to all metal roofs.
- Recycling: Steel, aluminum, copper, and zinc can be recycled. The amount of recycled metal in a product varies. Local options for recycling an old roof vary, too. Some areas also recycle asphalt shingles.
- Low weight: Many metal roofs weigh less than clay tile or slate. A contractor must still check that your roof base and frame suit the product.
- Choice of shapes: You can choose panels or products that look like shingles, shakes, or tiles.
- Cool-roof options: Some tested finishes reflect sunlight and release heat. They may lower cooling needs in a suitable climate.
Tradeoffs
- Starting cost: Metal often costs more than basic asphalt shingles. The product, roof shape, removal work, repairs, and labor affect the full price.
- Dents and finish damage: Hail and foot traffic can damage some roofs. The metal, thickness, panel shape, support, and size of the impact affect the risk.
- Movement: Metal expands when hot and shrinks when cool. The joints and fasteners must allow for that movement.
- Matching repairs: A new panel may be hard to match if the maker stops selling your color or shape.
- Sliding snow: Snow can slide off a smooth, steep roof. Ask about snow guards above doors, paths, and equipment.
- Safe access: Wet or icy metal can be slippery. The National Roofing Contractors Association advises homeowners to stay off roofs when possible. Use a skilled roofer for roof checks and snow work.
Fire, Wind, and Hail Ratings
Metal does not burn, but a roof’s fire rating covers more than the metal. The roof base and layer beneath the covering can affect its Class A, B, or C rating. UL explains why underlayment matters in fire testing. Check the rating for the full roof you plan to install.
Wind strength also depends on the full roof. FEMA has found that some metal roofs resist extreme winds while others fail below their design wind speed. Ask your contractor how the tested roof, fasteners, and edge details suit your site and local rules. See FEMA’s high-wind guidance.
Class 4 is the highest rating in the UL 2218 impact test. It does not promise no dents, leaks, or finish damage in a hailstorm. Check the product rating and warranty limits. Have a roofer inspect any suspected storm damage.
Lightning and Fire Safety
A metal roof does not attract lightning. It also does not replace a lightning-protection system. The Metal Construction Association says roof material does not decide where lightning strikes. Metal carries electricity and does not burn, which may lower the risk of fire after a strike.
Keeping Your Home Cool
Metal alone does not make a roof a “cool roof.” A cool roof reflects sunlight and releases heat. Color, finish, insulation, roof shape, and climate affect the result. The U.S. Department of Energy recommends light-colored painted metal over bare metal or clear coatings for this goal. It also notes that cool roofs can raise winter heating needs in cold areas. Check its cool-roof guide and your product’s test results.
Noise and Maintenance
Rain noise depends on the layers between the metal and your rooms. The roof base, attic, insulation, and ceiling all play a part. Ask about these layers if noise worries you. Follow the maker’s care instructions. Have a roofer check joints, seals, drains, and the finish at the recommended times.
Cost and Warranty Questions
You will need local bids for a useful price. Ask each roofer to name the metal, panel shape, finish, and maker, and explain how the panels attach. Compare quotes for the same materials and work.
Check whether the price includes removal, repairs, trim, labor, and permits. Also check the units: one roofing square equals 100 square feet. Use these questions to check what each bid includes:
| Item | Ask the contractor |
|---|---|
| Panel shape and fasteners | Which joints, clips, or visible screws will you use? |
| Roof preparation | Does the price include removal, roof-base repairs, and the layer beneath the panels? |
| Details | How will you seal edges and openings, drain rain, and allow the metal to move? |
| Product records | Which instructions, roof ratings, and warranties apply? |
Use our metal roof estimate checklist to compare quotes side by side. Our cost guide explains other items that affect the price.
A long or “lifetime” warranty does not tell you how long a roof will last. Read what it covers and leaves out. Check whether payments shrink with age and whether coverage transfers to a new owner. Ask who pays for labor and which wind or hail damage qualifies.
Alternatives
Other choices include architectural asphalt shingles, cedar shakes, slate, tile, and composite shingles. Compare weight, tested ratings, repairs, and local installer skills. Consider both the starting price and the cost of upkeep.