Market Data: Commercial Rooftop PV Exceeds 63 GW, Metal Roofing Share Continues to Rise
According to industry data, global commercial rooftop PV installed capacity reached 63 GW in 2024, with metal roofing PV projects accounting for as high as 66%, up significantly from 54% in 2020. Global metal roofing is growing at a rate of nearly 200 million square meters per year, and combined with the huge demand for retrofitting existing buildings, this constitutes a highly promising incremental market.
From an industry-wide perspective, **the global solar PV mounting system market was approximately US68.2 billion by 2034, at a compound annual growth rate of 4.4%. Among them, the metal roof PV mounting system, as an important sub-segment, is experiencing an accelerated evolution of the competitive landscape due to the ongoing impact of U.S. tariff policies and supply chain resilience efforts in various countries.
Ballasted Mounting: A Non-penetrating, High-efficiency Mainstream Technical Solution
The core advantage of the ballasted metal roof PV mounting system is that it requires no roof penetration; the system is secured by the dead weight of concrete ballast blocks or steel ballasts, fundamentally avoiding the risk of damage to the roof waterproofing layer caused by drilling. This feature not only protects roof integrity but also greatly improves installation efficiency and ease of construction.
In 2024, industry data showed that compared to penetrating mounts, ballasted systems can reduce installation time by 40%, but they require approximately 20% more roof space. Therefore, a trade-off between roof load capacity and PV installed capacity must be considered in project design. Regarding wind resistance, new-generation ballasted systems use optimized aerodynamic designs and multi-point distributed ballasting structures, achieving wind resistance up to level 14 (depending on configuration), effectively coping with extreme weather conditions such as typhoons and hurricanes.
Technological Breakthroughs: From Clamp Systems to BIPV Integration
In 2024, the metal roof PV mounting field saw three technical paths developing in parallel:
Clamp-based non-penetrating systems continue as the mainstream solution. T-clamps and standing seam clamps for standing seam metal roofs have become increasingly mature, allowing PV rails or modules to be fixed directly onto the raised ribs of metal roof panels, completely avoiding roof penetration and leakage risks. For example, at the headquarters of Vaisala in Colorado, USA, a rooftop PV system using a clamp system successfully passed rigorous wind load testing at speeds of up to 145 miles per hour.
Specialized mounts for trapezoidal corrugated sheets saw a peak of technical iteration in 2024. AEROCOMPACT, an Austrian mounting specialist, launched its COMPACTMETAL TL series, which uses 80 mm high-elasticity pads, allowing direct laying along the ribs of trapezoidal sheets without pre-drilling, greatly simplifying the installation process. The iNovaR system from French company EPC Solaire uses a lightweight composite insulation layer solution, enabling PV module installation without changing the original roof structure, and offers a 10-year waterproof warranty.
BIPV integrated solutions are evolving from add-on mounting systems to highly integrated designs, suitable for the retrofitting of old roofs and the integrated design of new buildings, with multiple technical paths being actively explored and applied.
Chinese Enterprises' Patent Innovations: Focus on Non-penetrating Installation in the Domestic Market
Between 2024 and 2025, Chinese companies achieved a number of patent breakthroughs in the metal roof PV mounting field, mainly focusing on two areas: adaptation to east-west sloping corrugated steel roofs and non-penetrating installation.
At the end of 2024, a domestic company obtained a patent for an "east-west sloping corrugated steel roof PV mount," which, through the coordinated design of clamps, ground rails, columns, beams, and adjustment components, effectively increases the power generation per unit area of east-west sloping corrugated steel roofs and reduces project investment costs. Around the same time, another patent for a "corrugated steel roof PV mount" was granted; this mount includes fixing clamps, rails, longitudinal drainage channels, transverse drainage channels, module supports, and module pressing mechanisms, ensuring installation stability without damaging the existing corrugated steel roof panel structure.
Furthermore, a snap-lock metal tile clamp patent integrates PV modules with a waterproof membrane via clamps without damaging the metal roof, meeting the roof's waterproof requirements, and offers advantages such as easy installation, high construction efficiency, and low cost.
Safety Certification and Industry Standards: UL 3741 Driving Industry Specification Upgrades
In August 2024, DCE Solar announced that its Eco-Top rooftop solar mounting structure successfully passed UL 3741 certification, meeting NEC 2020 requirements. The product features a ballasted design with durable recycled rubber ballast pads. Through optimized aerodynamic and structural performance, it reduces roof loading, and the number of mechanical connection points and ballast blocks is reduced by a factor of 5 compared to traditional solutions, saving US$0.03–0.06 per watt in material and labor costs.
This certification not only validates the product's safety performance but, more importantly, under the UL 3741 framework, the system does not require module-level rapid shutdown devices, further reducing overall system cost. Industry insiders point out that demand for metal roof PV mounting systems continues to grow in markets such as Asia-Pacific, Latin America, and the European Union. Related products have been installed on millions of metal roofs, reaching a total capacity of several gigawatts.
Major Global Players and Market Landscape
Major players in the global metal roof PV mounting system market include AEROCOMPACT, Antaisolar, K2 Systems, G Solar, Renusol, Mounting Systems, Novotegra, S-5, S:FLEX, StarWin Solar, as well as Chinese manufacturers such as Antaisolar, Clenergy, Xiamen Langpu, and Xiamen Kosun. In 2024, the top three manufacturers accounted for a significant share of the global market.
In terms of international markets, the U.S. metal roof PV mounting system market continued to expand in 2024, the Chinese market also grew steadily, Europe (especially Germany) remained an important regional market, and the market growth rates in Japan and South Korea were also noteworthy.
Policy Drivers: "Install Wherever Possible" for Building Rooftop PV Written into National Policy
In November 2024, China's National Development and Reform Commission and five other departments issued the "Guidance on Vigorously Implementing the Alternative Action Plan for Renewable Energy," clearly stating the need to "promote the addition of PV systems on existing building roofs, and promote the installation of PV systems on new workshops and new public buildings wherever possible," and emphasizing the "inclusion of priority use of renewable energy in urban planning, construction, renewal, and renovation."
Meanwhile, according to Solarbe PV statistics, as of July 2024, 70 local governments still had PV subsidy policies, covering residential and commercial & industrial PV projects, with upfront installation subsidies up to RMB 1.8/W and feed-in tariffs up to RMB 0.5/kWh. Zhejiang, Guangdong, and Jiangsu issued the most subsidies—28, 11, and 7 respectively. Guangdong Province also implemented a "three-year exemption and three-year 50% reduction" policy for corporate income tax for PV power generation enterprises, and exempted government-managed funds such as the renewable energy electricity surcharge for self-consumed distributed PV power.
