Short answer: Metal roofs are one of the best roofs for solar. On a standing-seam roof, the panels clamp onto the raised seams, so there are no holes in the roof at all. On exposed-fastener metal (R-panel or 5V crimp), the mounts screw into the structure through sealed, gasketed brackets. Metal roofs also last 40 years or more, so they usually outlive the panels and you won't have to remove the system for a reroof.
Why metal roofs and solar work well together
- Long life: a metal roof typically lasts 40 to 70 years, against 25 to 30+ years for solar panels. Asphalt shingles in Florida often need replacing sooner, which means removing and reinstalling the panels.
- Fewer or no penetrations: standing-seam roofs need no drilling, which removes the main leak risk.
- Strong attachment points: clamps and brackets made for metal roofs are tested for high wind uplift, which matters on the Gulf Coast.
- Simpler installs: clamp systems are often quicker to install than flashed shingle mounts.
Standing-seam metal roofs
Standing seam has raised vertical seams every 12 to 24 inches. Clamps (S-5! is the best-known brand) tighten onto the seam with set screws, and the rails or panels attach to the clamps.
- No holes in the roof panels, so the roof's weather seal isn't touched.
- Roof warranty friendly: because nothing penetrates the roof, many metal-roof warranties are unaffected. Confirm with your roofer.
- Clamp must match the seam profile. There are many seam shapes, so the installer identifies yours and uses the clamp tested for it.
Both railed and rail-less layouts work on standing seam. Rail-less uses fewer parts and sits closer to the roof; rails give more freedom to place panels where the seam spacing is awkward.
Exposed-fastener metal roofs (R-panel, 5V crimp, corrugated)
These roofs are common on Panhandle homes, barns and shops. They have no seams to clamp onto, so mounts attach through the metal:
- Direct-attach brackets sit on the raised ribs (the high part of the profile), where water doesn't run.
- EPDM or butyl gaskets under each bracket seal the hole.
- Screws go into the purlins or framing, not just the metal skin, so the array is held by the structure.
Done properly, these are watertight and long-lasting. Our guide to waterproofing penetrations on metal roofs compares flashing and other sealing methods in more detail.
Things your installer should check
- Roof condition and age: rust, loose fasteners or worn panels should be fixed first.
- Gauge and framing: thinner metal and wide purlin spacing affect which mounts can be used and how many.
- Wind load: in Florida, the racking must meet the Florida Building Code wind requirements for your location, and the design is permitted and inspected.
- Compatible metals: aluminum racking works with steel and Galvalume roofs. Copper must be kept away from them, because dissimilar metals in contact corrode.
- Thermal movement: metal roofs expand and contract with heat. Clamps and brackets made for metal roofs allow for this.
- Grounding and bonding: the array is bonded to code. Metal roofs don't make lightning strikes more likely.
Does a metal roof change cost or output?
Mounting hardware for standing seam is often similar in cost to a shingle installation and labour can be lower, though it depends on the roof. Exposed-fastener roofs fall in the same range. Output depends on the direction, tilt and shade of the roof, not the roofing material itself. A light-coloured roof keeps the attic cooler, but it makes little difference to standard panels.
Worried about leaks on any roof type? See whether solar panels damage your roof.
Frequently asked questions
Can you put solar panels on a metal roof?
Yes. Metal roofs are one of the best roof types for solar. Standing-seam roofs use clamps with no holes, and exposed-fastener roofs use sealed brackets screwed into the framing.
Do solar panels on a metal roof need holes?
Not on standing seam, where clamps grip the seams. Exposed-fastener roofs (R-panel, 5V crimp, corrugated) need sealed attachments through the ribs into the framing.
Will solar void my metal roof warranty?
Clamp-on installs on standing seam usually don't affect it. For exposed-fastener roofs, check the roofing manufacturer's requirements. Confirm in writing before work starts.
How long will a metal roof last with solar panels on it?
A metal roof typically lasts 40 to 70 years, longer than the panels, so the system usually never has to come off for a reroof.
Is a standing-seam roof better than R-panel for solar?
Standing seam is the easiest because nothing penetrates the roof. R-panel and 5V crimp work well too, using sealed brackets into the purlins.
Get a quote for solar on your metal roof or call (850) 737-5197.