Yes, solar panels work very well on a metal roof, and the two pair naturally. A well-built metal roof can last for decades, and so can solar panels, so the roof and the system can stay together for the long haul. On standing seam metal, panels can often be attached with clamps that grip the raised seams, which means no holes through the roof surface at all. Add a battery to the design, and the power your roof makes during the day can carry your home through the evening.
Metal roofs show up across Marin, Sonoma, and Napa, on homes, barns, workshops, and outbuildings. If you have one, or you're planning one, here is how solar goes on a metal roof and what to expect.
Why metal roofs and solar go well together
The biggest advantage is lifespan. Panels are built to produce for 25 to 30 years, and many keep going well beyond that. A metal roof in good condition can match that timeline, so you're far less likely to need to take the panels off for roof work down the road. Our post on how long solar panels last covers the panel side of that picture.
Metal roofs are also strong and lightweight; they shed rain quickly, and they hold up well in North Bay weather. That makes them a solid foundation for an array that will sit on the roof for decades.
Standing seam: clamps instead of holes
Standing seam is the metal roof style with raised ribs running from the ridge down to the eaves. Those seams are ideal for solar.
Instead of drilling through the roof, the mounting system can use clamps that attach to the top of each raised seam. The rails and panels then attach to the clamps. Because nothing passes through the metal, the roof's weather surface stays intact. The clamps match the specific seam profile on your roof, so they hold the array securely while keeping the roof as watertight as before.
That no-penetration approach is a big reason standing seam metal is often described as one of the best roofs for solar.
Other metal roof styles
Not every metal roof is standing seam. Corrugated and ribbed metal panels, common on barns, workshops, and many rural homes, have exposed fasteners and a different profile. Metal shingles and tiles are designed to look like other roofing materials.
These roofs can also carry solar, with mounts designed for that roof type. The mounting attaches securely to the roof structure and seals properly against the metal, so the roof stays protected. Part of our site visit is identifying exactly what kind of metal roof you have, then choosing the attachment that fits it. Our post on whether solar panels damage your roof explains how a careful install keeps any roof sound.
Laying out panels on a metal roof
Metal roofs tend to have long, clean planes with few interruptions, which makes for neat, organized layouts. Panels usually follow the roof pitch, sitting a few inches above the surface on their rails.
That small gap does useful work. Air moves under the panels, which helps keep them cool, and cooler panels produce a little more efficiently. Rain runs off the panels onto the metal below, and the roof's drainage keeps working as designed.
Direction matters on a metal roof the same as on any pitched roof. A south-facing plane is ideal, and east and west planes work well too. We cover how orientation affects production and which direction solar panels should face. If your roof is flat or low-slope metal, the approach is closer to what we describe in our post on solar panels on a flat roof.
Planning solar and a metal roof together
If you're planning a new metal roof, it's worth thinking about solar at the same time. Knowing where the panels will go helps everyone plan, from the roof layout to where wiring and vents end up. It also means the new roof and the new array start their long lives together.
If your metal roof is already in place, that works just as well. During the site visit, we check the roof's condition and flag anything worth addressing before the panels go on, so your system sits on a roof that's ready to last as long as it does.
Metal roofs on barns, shops, and outbuildings
Many properties in Sonoma and Napa have metal-roofed barns, workshops, and garages, and those buildings can be great places for panels. They often have large, open roof planes with good sun, and putting panels there keeps the main house roof clear. Our post on solar for rural and agricultural properties covers more options for larger properties, including ground-mounted arrays.
Pairing your metal-roof solar with a battery
Every system we design includes a home battery, and a metal roof doesn't change that. Your panels make the most power in the middle of the day. The battery stores what your home doesn't use right away and powers your evenings, when electricity costs the most.
A Savings Battery stores and discharges every day to help lower your electricity bill. A Backup Battery does that and also keeps your chosen circuits running during an outage. We size the battery alongside the panels so they're designed to work together from the start. If you already have solar on a metal roof, we can add a battery to your existing system.
How we plan a metal-roof install
Every project starts with a site visit. We identify the roof type and seam profile, check the structure and condition, look at sun and shading, and talk through how your household uses power. From there, our designers choose the mounting approach, lay out the panels, and size the battery. We handle permits and utility paperwork, and our licensed crews do the install.
We're 100% employee-owned, we've worked across the North Bay since 1984, and we've installed more than 9,000 systems on all kinds of roofs. We're licensed as a General Contractor (B) and Electrical Contractor (C-10), and we were one of the first companies in California to earn the state's C-46 solar license.
Have a metal roof and wondering what solar could do for it? Contact SolarCraft or call Sonoma/Napa 707.778.0568 or Marin 415.382.7717.
