1. Product Structure Design
This commercial solar mounting kit consists of three core parts: U mini base rail, L-shaped foot bracket and long main rail. The U mini base rail is fixed on the raised ribs of trapezoidal metal roof only at stress points instead of covering the whole roof surface. The L foot bracket connects the U base rail and main rail, realizing horizontal and vertical adjustment to offset roof unevenness and dimensional tolerance of metal sheets. Long main rails are laid parallel to carry PV modules, locked by mid clamps and end clamps to fix solar panels stably. The separated layered structure can buffer stress caused by roof thermal expansion and contraction, avoiding hidden cracks of solar panels and roof damage.
2. Excellent Waterproof & Roof Protection Performance
Each U mini base rail is fitted with full-length EPDM anti-slip waterproof rubber gasket. Stainless steel self-tapping screws penetrate the rubber pad for double sealing, effectively preventing rainwater leakage from screw holes. We only drill holes on the raised ribs of metal roof rather than water tank areas to minimize water leakage risks. The EPDM gasket isolates aluminum alloy and galvanized steel sheet to avoid galvanic corrosion, preventing roof rust and perforation. Short U base rails only contact the roof at fixed points, without large-area friction to scratch the coating of metal roof, extending the service life of the original factory roof.
3. Wide Compatibility & Flexible Installation
Kseng U base solar rack fits most mainstream trapezoidal corrugated metal sheets including 840, 900, 760, 820 profiles. The length of U mini base rail can be cut on site to match different rib spacing, while multiple specifications of L foot brackets provide adjustable mounting heights. Long main rails can be spliced freely for unlimited PV array expansion, compatible with 450W–700W monofacial solar panels, supporting both landscape and portrait module layout. All accessories are standardized modular parts without customized welding, single worker can complete assembly on high roof to save construction time.
4. Durable Material & Stable Mechanical Performance
All aluminum extrusions adopt 6063-T5 material with hard anodized surface treatment, resistant to acid rain and coastal salt fog corrosion. All bolts, screws and clamps are 304 stainless steel for long-term rust-free use, matching the 25-year service life of solar modules. Multiple U base + L foot assemblies support the main rail at intervals, evenly distributing wind load and snow load to roof ribs without local stress tearing the metal sheet. Reserved assembly gaps allow thermal expansion and contraction, ensuring stable mechanical performance in typhoon and heavy snow areas.
FAQ：
Q1: What kind of roof is this solar mounting system suitable for?
A1: This rack is designed for trapezoidal corrugated metal roof, non standing seam tin roof, widely used on factory, warehouse, logistics park and supermarket roof. It fits 840/900/760/820 trapezoidal metal sheets.
Q2: How does the L foot bracket work with U mini base rail?
A2: The L foot acts as an adjustable connector between U base rail and main long rail. It supports horizontal and vertical adjustment to balance uneven roof surface and sheet dimensional errors, separating the roof fixed base and PV bearing rail to buffer structural stress.
Q3: Will this solar bracket cause roof leakage?
A3: The system adopts dual waterproof design: full-length EPDM gasket under U base rail + rib-only drilling without punching on water channels. The self-tapping screw penetrates rubber pad to seal holes, greatly reducing water leakage risks.
Q4: What material are your solar mounting components made of?
A4: Structural rails and brackets are 6063-T5 anodized aluminum; all fasteners, clamps are SUS304 stainless steel; waterproof pad is weather-resistant EPDM rubber, 25-year outdoor service life.
Q5: Is it easy to install this U base solar rack on high metal roof?
A5: All modular lightweight parts are easy to carry on roof. Standard installation steps: fix U base rail → install L foot bracket → lay main rail → lock solar panels with clamps, single installer can finish construction independently.
Q6: Does this solar bracket reduce the load on metal roof?
A6: U base rails are only arranged at stress-bearing rib points, loads of solar panels are evenly distributed to multiple roof ribs, reducing local pressure on thin metal roof, most old warehouses do not need extra roof reinforcement.
