Roof Panels: Every Panel Type Compared

Walk the roofing aisle at a building supply store and you’ll find panels made of steel, aluminum, polycarbonate, PVC, fiberglass, and foam-cored composites — all sold in similar 26-inch sheets, at prices from $1 to $10 per square foot, for wildly different jobs. Choosing the right roof panels starts with one question: does this roof cover a house, or a patio, shed, carport, or greenhouse? This umbrella guide compares every major panel family on cost, lifespan, light transmission, and best use, then points you to the deep-dive guides for each.

Part of our Roofing guide — explore the full guide →

The Panel Families at a Glance

• Metal (steel/aluminum): $1.50 – $6/sq ft material; 30 – 60 year life; opaque; homes, barns, sheds, carports.
• Polycarbonate: $2 – $6/sq ft; 15 – 25 years; clear to translucent; patio covers, pergolas, greenhouses.
• PVC: $1 – $3/sq ft; 10 – 20 years; translucent; budget sheds and lean-tos.
• Fiberglass (FRP): $1.50 – $4/sq ft; 10 – 20 years; diffused light; skylight strips in metal roofs, ag buildings.
• Insulated sandwich panels: $6 – $12/sq ft; 30 – 40 years; opaque; patio rooms, workshops, cold-climate porch roofs.

Prices are material only; installation typically adds $2 to $6 per square foot depending on structure and height.

Metal Panels: The Structural Standard

For any roof that shelters living space, metal is the default panel answer. Corrugated and ribbed steel panels screw down fast over purlins or decking, carry Class A fire and Class 4 hail ratings in quality gauges, and last 30 to 60 years — far beyond any plastic. Steel dominates on price; aluminum earns its 25 percent premium within a mile of salt water. Panels come in 29 to 24 gauge with paint systems from basic polyester to 40-year Kynar. Because this family is deep enough for its own library, we cover profiles, gauges, and coatings in our full metal roofing and steel roofing guides — the short version is: 26 gauge minimum on homes, concealed-fastener standing seam if the budget allows, and exposed-fastener corrugated for outbuildings.

Polycarbonate Panels: Tough Daylight

Polycarbonate is the premium light-transmitting panel — the material of safety glazing and riot shields, formed into corrugated sheets and twinwall/multiwall hollow-channel boards. It takes hail that shatters fiberglass and PVC, carries co-extruded UV protection good for 15 to 25 years outdoors, and transmits up to 90 percent of light in clear grades, with bronze, gray, and opal tints to cut glare and heat over patios. Twinwall versions add insulation for greenhouses. Cost runs $2 to $6 per square foot for the sheet. Its weaknesses are expansion (it moves about 1/8 inch per 3 feet across a hot day, so holes must be oversized) and scratching. For span tables, thicknesses, and fastening details, see our dedicated polycarbonate roof panels guide.

PVC and Acrylic: The Budget Plastics

Corrugated PVC is the cheapest panel on the shelf at $1 to $3 per square foot — fine for a garden shed roof or temporary lean-to, but it embrittles in UV and cold, yellows over 5 to 10 years in hard sun, and hail-punctures far more easily than polycarbonate. Acrylic sheets split the difference: clearer than polycarbonate and more scratch-resistant, but brittle under impact. The honest rule: on anything you want to still look good in year ten, spend up from PVC. We compare PVC, acrylic, and polycarbonate head-to-head in our plastic roof panels guide, and if daylight is the whole point of your project — a bright patio cover or shed skylight — our clear roof panels guide ranks every transparent option by light transmission and longevity.

Fiberglass (FRP) Panels: Diffused Light for Work Buildings

Fiberglass-reinforced plastic panels are the translucent strips you see glowing in barn and warehouse roofs. They match common metal corrugation profiles exactly, which makes them the standard choice for inserting daylight courses into a steel-paneled roof — one FRP panel per bay lights a shop for about $30 to $60 a sheet. Light comes through diffused rather than clear, which kills glare, and the material handles heat well. The aging story is the drawback: UV erodes the surface resin over 10 to 15 years, exposing fibers (“fiber bloom”) and dropping light transmission. Buy panels with a UV gel coat, and expect to replace them once during the life of the metal roof around them.

Insulated Sandwich Panels: Roof, Insulation, and Ceiling in One

Structural insulated roof panels laminate a foam core (EPS or polyurethane, typically 3 to 6 inches) between two metal skins, delivering R-values from about R-12 to R-30, long clear spans, and a finished interior ceiling in a single 30-minute-per-panel install. At $6 to $12 per square foot for materials they are the priciest family, but for a patio enclosure, three-season room, or backyard office they replace three trades at once — roofing, insulation, and ceiling finish. Most residential systems come in white or tan skins with snap-together edges; check the span rating against your local snow load before ordering, since the foam core, not the thin skins, does the structural work.

A Worked Example: Pricing a 12 x 20 Patio Cover

Numbers make the families concrete. A 12-by-20-foot attached patio cover is 240 square feet of roof — call it eleven 26-inch-wide panels at 12-foot lengths after side laps. In corrugated PVC, materials run about $350 to $500 including closures and screws. Polycarbonate lands at $600 to $1,100 depending on thickness and tint. Painted 29-gauge steel comes in at $500 to $800 and blocks all light; 26-gauge with a Kynar finish nearer $900. Insulated 3-inch sandwich panels jump to $1,700 to $2,600 but arrive as roof, insulation, and ceiling in one lift. Add $600 to $1,500 for professional labor on any of them, or a long weekend of DIY on the lighter materials — sandwich panels want two sets of hands and a plan for lifting 20-foot panels overhead.

The pattern generalizes: on small structures, the panel price gap between cheap and premium is a few hundred dollars, while the labor and framing cost the same either way. That is the argument for buying one tier better than the minimum on anything you expect to keep ten years.

Snow, Wind, and Permits

Panel roofs fail from loads more than leaks. Every panel family publishes span tables at rated loads — a polycarbonate sheet fine on 24-inch purlins under Georgia rain collapses under a Buffalo snow load that demands 16-inch spacing or a thicker profile, and metal panels gain load capacity with gauge and rib height. Check your ground snow load (your building department will quote it) against the manufacturer’s table, not against what the neighbor’s shed survived. Wind matters at the edges: screw schedules tighten at eaves, rakes, and corners, and lightweight plastic covers in open country want screws in every corrugation at panel ends. Most jurisdictions require a permit for any attached patio cover or carport regardless of panel choice; detached sheds under 120 to 200 square feet are often exempt, but the load math still applies whether anyone inspects it or not.

Matching the Panel to the Project

Cut through the options with the job in front of you:

• House, garage, or barn: steel panels — 26 gauge or better, standing seam if it’s a forever home.
• Patio cover or pergola where you want light: polycarbonate, tinted bronze or opal to tame the heat.
• Patio room you’ll sit under in July or January: insulated sandwich panels.
• Shop or barn needing daylight: steel field panels with FRP skylight strips.
• Cheap shed or temporary cover: corrugated PVC, eyes open about its lifespan.
• Coastal anything: aluminum over steel, stainless fasteners throughout.

Whatever family you land on, two rules hold across all of them: buy the manufacturer’s matching closure strips and fasteners rather than improvising (leaks start at generic hardware), and check the span rating against your purlin spacing — a panel sagging between supports fails years before its material would have.