For optimal residential durability, stability, and comfort underfoot, a total plank thickness between 6mm and 8mm paired with a protective wear layer of at least 20 mils is considered the gold standard. Thinner options (4mm) work adequately in low-traffic guest bedrooms, but heavier-traffic areas like kitchens, hallways, and living rooms benefit immensely from thicker rigid-core (SPC) constructions that bridge minor subfloor imperfections, dampen sound, and resist heavy dents.