The Roof Washer is typically designed with a large diameter to evenly distribute the clamping force over a larger panel area when the screw is tightened. This is crucial for softer or more brittle roofing materials like plastic, fiberglass, or thin metal, as it effectively prevents the panel from cracking or deforming due to excessive point pressure. It ensures secure screw fixation while maintaining the structural integrity of the roofing material under wind load.
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