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The "L" shaped roof clamp (often called L-foot, L leg, or L bracket) in a metal roof solar module mounting system is a simple but universal connector for reliably fixing the rails that supports solar modules to the trapezoid metal 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 foot bracket for metal roof solar photovoltaic (PV) systems is a fundamental connector in such systems. It is right-angled, with one end fixed to the corrugated metal roof rib or fixed to a roof clamp or hanger bolt, and the other end connecting to rail. The L foot 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 used in commercial and industrial rooftop distributed PV projects. When used with other roof clamps, it is designed to provide a stable and adjustable installation base for the PV panels without damaging the roof's waterproofing layer.
Product Components
Advantage
▶ Easy Installation
The L foot solution is simple, and allows for quick positioning and bolt fixing, saving on-site labor.
▶ Universal Solution for All Metal Roof
The L foot can be install on Klip Lok clamp, Seam Lok clamp or other types of roof clamps, in order to raise the solar panel higher from metal roof, with no need to drill holes in the corrugated steel sheet.
It also can be put on trough of any types of metal roof, which makes it universal metal roof mounting solution.
▶ Reduced Roof Load Requirements
The aluminum alloy L foot is lightweight, placing less extra burden on the roofs of older factory buildings.
▶ Adjustable Capabilities
L foot of different heights and with slot holes can be put on metal roof ribs (crests) or metal roof surface (trough), to accommodate the requirements of elevating the solar panels.
▶ Good Corrosion Resistance
Commonly made of aluminum alloy with stainless steel fastener, it remains rust-free during whole service life of solar power station in most environments.
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: On trapezoid corrugated metal roofs, or on the trough of any other type of corrugated metal roofs.
▪ On other types of roof clamps: The L foot can work with any other type of roof clamps with a flat top surface.
▪ Any type of metal roof: The L foot can work on any type of metal roof, no matter what roof rib (crest) shape.
Important Notes:
▶ Roof Type Confirmation
This clamp is commonly used for metal roof panels with trapezoid shape, but also can be used on any other types of metal roofing sheet.
▶ Installation of L Foot
If use L foot only without other roof bracket or roof clamp, it should be connect to the purlin under roof by screws, for safe installation. In order to ensure waterproof, Solar First provide EPDM pad for L foot and screws, but it is also recommended to apply silicone around the L foot and screw for better and longer usage.
▶ 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.
Summary
The L foot for metal roof solar photovoltaic systems is a mature and practical solution. It boasts advantages such as light weight, quick installation, and good corrosion resistance, effectively reducing additional load to the roof structure.
It is a universal solution for all types of metal roofing sheet. By self tapping screw, the L foot will drill trough metal sheet and connect into steel purlin. The EPDM pads under L feet and screws will ensure waterproof after installation.
Solar First Project Reference
Related Knowledge Points
This product is a photovoltaic (PV) bracket accessory specifically designed for Klip-Lok metal corrugated roofs. It employs a non-penetrating clamping design, eliminating the need for drilling into the roof surface. The clamps secure themselves to the Klip-Lok rib of the roof ridge, providing a reliable connection point for rails and PV modules. This design avoids damage to the roof panels caused by drilling, effectively reducing the risk of roof leaks, and is particularly suitable for commercial and industrial roofs with high waterproofing requirements.
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The "L" shaped roof clamp (often called L-foot, L leg, or L bracket) in a metal roof solar module mounting system is a simple but universal connector for reliably fixing the rails that supports solar modules to the trapezoid metal 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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The standing seam roof clamp is specifically designed for standing seam (or seam lok) metal roofing sheet as a non-penetrating solution. It is fixed to the standing seam of the roof by clamping, allowing the photovoltaic modules to be installed securely without drilling a single hole in the roof.
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The U rail for photovoltaic (PV) mounting on corrugated steel roofs is a solar panel installation solution specifically designed for trapezoid corrugated metal roofs. It is widely used due to its high efficiency and reliability. It is a design that ensures a balance between structural strength and ease of installation.
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The adjustable front and rear leg solar mounting bracket is a solar panel mounting system specifically designed for installation on metal corrugated steel roofs. Its name comes from its unique front and rear support structure design, by adjusting the height difference between the front and rear legs, the tilt angle of the photovoltaic panels can be varied to adapt to different regional sunlight conditions, roof slopes, and load-bearing requirements.
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The wave-shaped roof clamp is specifically designed for wavy corrugated metal roofing sheet. Its curved bottom surface conforms to the roof profile, and it works with self-tapping screws to connect to the purlins, ensuring a stable installation for the solar module. Made of aluminum alloy, it is weather-resistant, durable, and easy to install.
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