When selecting white PVC roofing tiles, the key factors are the source of the PVC raw powder and the product’s wall thickness, not the price. Reputable manufacturers add UV-resistant additives and ensure a wall thickness of at least 1.5 millimeters, resulting in controllable color changes during 5–6 years of outdoor use. To assess quality, compare color differences among samples from multiple manufacturers after exposing them to direct sunlight on a balcony for two weeks. During inspection, use a digital caliper to randomly measure wall thickness at multiple points to avoid selecting products with insufficient wall thickness...
