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Trapezoidal clamps are key connectors used in photovoltaic projects with trapezoidal corrugated steel roofs. Their main function is to secure the photovoltaic bracket's guide rails to the corrugated steel roof, providing a reliable foundation for subsequent installation of photovoltaic modules.
Color :
Natural silver/ black（Colored according to customer requirements）Certification :
ISO，SGS，CEMaterial :
Anodized Aluminum 6005 T5, Stainless Steel 304Product Origin :
Tianjin, FujianShipping Port :
Shanghai, Ningbo, Tianjin, Xiamen, Shenzhen ports
Product Description
The trapezoidal clamp is a photovoltaic (PV) bracket connector specifically designed for trapezoidal corrugated steel roofs. It secures the PV rails to the roof by clamping the sides of the corrugated steel roof, eliminating the need for any mounting holes in the roof. This product solves the problem of reduced roof sealing that can occur with traditional through-mounting methods and is one of the most widely used bracket accessories in commercial and industrial distributed PV projects.
Product Components
Advantages
▪ Non-perforated fixing
Eliminates the need for drilling into the roof, structurally avoiding the risk of water leakage caused by openings and reducing later maintenance costs.
▪ High installation efficiency
Utilizes bolt locking, allowing for single-person operation, resulting in fast construction and low labor costs.
▪ Strong adaptability
Compatible with mainstream trapezoidal corrugated steel roofing sheets, covering corrugated heights (25~75mm) and opening widths (20~60mm), and supports customization according to tile cross-section drawings.
▪ Excellent weather resistance
Made of anodized aluminum alloy (film thickness ≥10μm) or 304/316 stainless steel, providing excellent corrosion resistance and adaptability to coastal and industrial environments.
▪ Reliable mechanical properties
The overall tensile and shear strength design values of the clamps are calculated to meet the safety requirements of large-span, high-wind-pressure areas.
Parameters
| Installation | Metal Roof |
| Wind Load | up to 60m/s |
| Snow Load | 1.4kn/m² |
| Tilt Angle | Parallel to Roof Surface |
| Clamp height | 50mm ~ 120mm (depending on the tile type) |
| Standards | GB50009-2012, EN1990:2002, ASCE7-05, AS/NZS1170, JIS C8955:2017, GB50429-2007 |
| Material | Anodized Aluminum AL6005-T5, Stainless Steel SUS304 |
| Warranty | 10 Years Warranty |
Applicable Scenarios
▪ Corrugated steel roofing for industrial and commercial buildings (power plants, logistics parks, manufacturing workshops, warehouses, etc.)
▪ Corrugated steel roofing with trapezoidal corrugated sections
▪ Installation of framed and partially frameless photovoltaic modules
▪ In coastal areas with high salt spray (stainless steel or reinforced anodized steel is recommended)
▪ Large-span rooftop photovoltaic projects (used with high-strength guide rails)
Important Notes:
▶ Tile Type Confirmation
Before selection, a cross-sectional diagram of the corrugated steel tile or on-site sampling is required to confirm the wave height, opening width, and angle. Otherwise, clamping failure or insufficient clamping force may occur.
▶ Material Selection
In coastal areas, heavily polluted industrial environments, or high-humidity environments, 304 stainless steel clamps or aluminum alloy clamps with an oxide film thickness ≥15μm are recommended.
▶ Tightening Torque Control
Insufficient torque will cause clamp slippage, while excessive torque may crush the corrugations or damage bolt threads. It is recommended to use a torque wrench and refer to the design values.
▶ Buffer Pads
If the tile coating is thin or has high surface finish requirements, clamps with EPDM pads should be used to avoid direct metal-to-metal contact that could scratch the coating.
▶ Load Verification
The load-bearing capacity of the clamps is affected by multiple factors such as tile strength, spacing, and bolt preload. It must be verified by a structural engineer based on local wind pressure, snow pressure, and component layout.
▶ Installation sequence
It is recommended to install and lock the fixture first, then install the guide rail, and finally adjust the alignment as a whole to avoid loosening of the fixture due to reverse process.
Summary
Trapezoidal clamps are an indispensable bottom-level connector in photovoltaic (PV) support systems for corrugated steel roofs. With a core design concept of "non-perforated clamping," they effectively reduce the impact on roof integrity while ensuring installation reliability. The product features a simple structure, weather-resistant materials, and a wide range of compatibility. Combined with proper selection and standardized construction, they can achieve stable and long-lasting PV system fixation on various trapezoidal corrugated steel roofs.
Solar First Project Reference
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