Views: 0 Author: Site Editor Publish Time: 2025-11-12 Origin: Site
In modern solar roof mounting systems, the choice of fasteners plays a crucial role in system durability and safety.
Bimetal self-tapping screws are the preferred solution for metal roofs, tile roofs, and asphalt shingle roofs, combining stainless steel corrosion resistance with carbon steel drilling strength.
These screws ensure a secure, watertight, and long-lasting connection, even under extreme weather conditions.
Bimetal self-tapping screws are made of two different metals — usually a stainless steel upper body and a carbon steel drill tip.
This combination delivers the perfect balance of anti-corrosion performance and mechanical strength, which is essential for solar roof systems exposed to outdoor elements year-round.
Keywords: bimetal self-tapping screw for solar roof, stainless steel roofing screw, solar fasteners, self-drilling roofing screw, corrosion resistant solar screw
Solar roof systems are constantly exposed to rain, wind, and UV radiation.
The stainless steel head and body protect the screw from rust and galvanic corrosion, ensuring the mounting system remains stable for years.
The carbon steel tip easily penetrates metal sheets, aluminum rails, or steel purlins, providing a tight and vibration-resistant connection without pre-drilling.
Metal Roofs: Used with L feet or standing seam clamps to secure solar rails.
Tile Roofs: Fixes mounting hooks or brackets to rafters without cracking tiles.
Asphalt Shingle Roofs: Works with flashing kits for waterproof installation.
Designed for 20+ years of outdoor service, these screws maintain structural stability even in coastal, desert, or high-humidity climates.
The self-tapping design eliminates pre-drilling, reducing labor time during large-scale solar roof installations.
| Item | Material | Coating | Head Type | Tip Type | Roof Type | Application |
|---|---|---|---|---|---|---|
| Bimetal Self-Tapping Screw | Stainless Steel + Carbon Steel | Zinc / Plain / Customized | Hex / Pan Head | Self-Drilling Tip | Metal / Tile / Shingle Roof | Solar Roof Mounting System |
Used to fasten L-feet brackets, standing seam clamps, or Klip Lok clamps to the roof deck.
Ensures high pull-out strength and leak-free sealing with EPDM washers.
Connects roof hooks to wooden rafters or support beams.
The stainless body resists corrosion caused by humidity trapped under tiles.
Installed with flashing and brackets to create a watertight connection between the solar rail and roof surface.
[Insert photo: Bimetal screw fixing L feet on metal roof panel]
✅ Corrosion-free performance in long-term outdoor exposure
✅ Strong penetration through steel or aluminum roof structures
✅ No pre-drilling required – faster installation
✅ Waterproof sealing for roof safety
✅ Long lifespan matching the 25-year solar system design life
Bimetal self-tapping screws help ensure every roof-mounted solar system remains secure, efficient, and maintenance-free.
Always use EPDM or rubber washers for waterproofing.
Avoid over-torque to prevent deformation of roof sheets.
Suitable for solar clamps, roof hooks, and aluminum rails.
Use impact drivers with proper torque control for best results.
Q1: Why are bimetal screws better than normal stainless steel screws for solar roofs?
A: Bimetal screws combine stainless steel corrosion resistance with carbon steel drilling strength — giving faster installation and stronger grip on metal roofs.
Q2: Can they prevent roof leaks?
A: Yes. With EPDM sealing washers, bimetal screws create a watertight seal that prevents moisture intrusion.
Q3: Are they suitable for coastal or humid areas?
A: Absolutely. The stainless steel body resists salt and oxidation, making them perfect for coastal solar projects.
Q4: Can I use them on both metal and tile roofs?
A: Yes. Different head and washer types are available for metal, tile, and shingle roofs.
