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Metal roofing screws are constructed to pierce through hard steel cladding, usually featuring self-tapping threads. Polycarbonate roofing screws are specifically optimized to accommodate plastic sheet expansion and contraction without causing damage, often featuring specialized large washers.
Galvanized roofing screws feature a durable zinc-coated layer that delivers exceptional resistance against oxidation, rain, and environmental moisture, ensuring the structural stability of the installation over time.
White roofing screws are coated with a specialized exterior finish to seamlessly integrate with white-colored roof panels. Beyond the aesthetic advantage, the coating provides an extra protective layer against environmental degradation.
The screw should be long enough to pass fully through the roofing sheets and securely embed into the timber or steel purlins below, typically extending at least 10-15mm past the underside of the structural support.
Reusing roofing screws is highly discouraged. Over time, the rubber EPDM sealing washers degrade due to UV exposure and pressure. Reusing them compromises the waterproof seal, leading to leaks.
