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The "L-angle" (often called L-foot, L-shaped foot, or L-shaped support) in a color steel roof photovoltaic support system is a simple but indispensable metal connector responsible for reliably fixing the guide rails supporting the photovoltaic modules to the color steel roof. It has a right angle (L-shape) shape, a lightweight structure, and mainly serves as an anchoring element connecting the upper and lower parts of the structure.
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 L-shaped bracket (L-leg) for color steel roof photovoltaic (PV) systems is a fundamental connector in such systems. It is right-angled (L-shaped), with one end fixed to the corrugated edge of the color steel roof using a special clamp or fastener, and the other end connecting to and supporting the PV rail. The L-shaped bracket itself does not directly bear the weight of the modules; instead, it acts as a force transfer component, safely transferring the load of the modules and rails to the roof structure.
This product is commonly found in commercial and industrial rooftop distributed PV projects. Its design aims to provide a stable and adjustable installation base for the PV panels without damaging the roof's waterproofing layer (when used with clamps).
Product Components
Advantage
▶ Easy Installation
The L-shaped structure is simple, and with standard clamps, it allows for quick positioning and bolt fixing, saving on-site labor compared to welding or using expansion bolts.
▶ Protective Roof Waterproofing
When using specialized clamps for fixing, there is no need to drill holes in the corrugated steel sheet, fundamentally avoiding the risk of leakage caused by screw holes.
▶ Reduced Roof Load Requirements
The aluminum alloy L-angle is lightweight (approximately 0.3~0.8kg per set), placing less extra burden on the roofs of older factory buildings.
▶ Adjustable Capabilities
L-angles of different heights or with grooves can accommodate differences in the height of corrugated steel sheet crests and the leveling requirements of guide rails.
▶ Good Corrosion Resistance
Commonly made of aluminum alloy or stainless steel, it remains rust-free for a long time in general industrial environments and coastal areas.
Parameters
| Installation | Metal Roof |
| Wind Load | up to 60m/s |
| Snow Load | 1.4kn/m² |
| Tilt Angle | Parallel to Roof Surface |
| Height | 80mm/100mm /180mm |
| 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
▪ Industrial and commercial factory buildings: Large corrugated steel roofs, requiring high standards of waterproofing and construction speed.
▪ Logistics and warehousing centers: Large roof area, suitable for non-perforated installation methods.
▪ Agricultural greenhouses: Metal pitched roofs, clamps can avoid damaging the original structure.
▪ Renovation of old photovoltaic projects: Existing metal roofs cannot be drilled; clamp fixing is the ideal solution.
▪ Buildings with strict waterproofing requirements: Such as factory roofs in the electronics, pharmaceutical, and food industries.
Important Notes:
▶ Roof Type Confirmation
This clamp is only suitable for metal roof panels with a standing seam (Klip-Lok) structure, and not for trapezoidal corrugated panels or angled seam panels.
▶ Load Calculation
The number and spacing of clamps should be calculated by a structural engineer based on local wind speed, snow load, roof span, and other conditions.
▶ Installation According to Specifications
Bolts must be tightened to the specified torque (usually 16-20 N·m) using a torque wrench. Overtightening may damage the ridge, while undertightening may cause slippage.
▶ Roof Condition Inspection
Before installation, ensure the roof panels are free from severe rust, deformation, or coating peeling; otherwise, the clamping force may be insufficient.
▶ Regular Inspection
It is recommended to check the clamp tightness annually, especially after typhoons or heavy snowfalls.
▶ Grounding Connection
If metal rails are used, proper grounding between the components and the roof must be performed according to electrical specifications.
▶ Avoid Mixing
Clamps from different brands or batches may have dimensional variations and should not be mixed on the same roof.
Installation method
▶ Special fixture fixation (recommended method)
▪ Operation: Use a snap-in fixture that matches the specific profile (such as corner-trim type, upright edge-lock type) to directly clamp the L-shaped piece onto the peak of the color steel sheet.
▪ Advantages: Truly non-destructive installation, does not penetrate the roof surface, fundamentally eliminating the risk of water leakage, and is currently the most highly recommended method.
▶ Through-type fixation (use with caution!)
▪ Procedure: Use self-tapping screws or wood screws to penetrate the color steel sheet directly and fix the L-shaped nails onto the underside of the roof truss.
▪ Disadvantages: It damages the roof waterproof layer. If the sealing is not done properly, it is very likely to rust and leak at the screw holes, seriously shortening the lifespan of the roof. It is only used in special structural cases.
Summary
The L-angle bracket for color steel roof photovoltaic systems is a mature and practical small connector. Its core value lies in achieving non-destructive installation through specialized clamps, and constructing a stable photovoltaic support system in conjunction with guide rails. It boasts advantages such as light weight, quick installation, and good corrosion resistance, effectively reducing damage to the color steel roof and additional load.
However, it is not a panacea—the compatibility of the roof tile type, structural calculations, the quality of the seals, and construction specifications directly affect long-term safety. Improper penetration fixing, mismatched roof tile type, and exceeding load limits are the three main causes of roof leaks or damage to the photovoltaic system.
Solar First Project Reference
Related Knowledge Points
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The "L-angle" (often called L-foot, L-shaped foot, or L-shaped support) in a color steel roof photovoltaic support system is a simple but indispensable metal connector responsible for reliably fixing the guide rails supporting the photovoltaic modules to the color steel roof. It has a right angle (L-shape) shape, a lightweight structure, and mainly serves as an anchoring element connecting the upper and lower parts of the structure.
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