FAQs About Solar Panels On A Metal Roof Because metal roofs have just recently become more mainstream and popular, many homeowners have questions. What are the best solar panels for a metal roof? Both crystalline panels with a frame and thin-film solar work well with metal roofs. This is especially true for standing seam metal roofs and crystalline panels because the hardware can clamp directly onto the seams, avoiding roof penetrations.   What is the life expectancy of solar panels on a metal roof? Because metal roofs typically last between 40 and 70 years and solar panels for 25 to 30 years, metal roofs often outlast the solar panel system. By contrast, the lifespan of an asphalt shingle roof is about 15 and 30 years, depending on the climate.   What is the best type of roof material for installing solar panels? Although asphalt shingles are the most common roofing material for solar panels, standing seam metal roofs are the best metal option. The lifespan of the roof is longer than the solar panels and it isn’t necessary to penetrate the roof during the solar system installation. This is beneficial for both the roof warranty and long-term durability.   Are there any disadvantages of a metal roof? One of the biggest downsides to a metal roof is the upfront cost, which is significantly higher than an asphalt shingle roof. However, because the roofs last longer, they can still be a smart investment. Unfortunately, metal roofs can be noisier when it rains than asphalt shingles, depending on the decking and insulation. Also, sometimes the fasteners can fail before the roofing material.   What type of roof can solar panels not be installed on? Wood and slate roofs are not ideal for solar panels. For example, installing solar panels on cedar shingle roofs is a fire hazard. It is important to use standoffs when installing solar panels on slate roofs to avoid drilling into the slate.