The primary purpose of a quarter round molding is to cover the expansion gaps left around the perimeter of newly installed flooring, such as hardwood, laminate, or luxury vinyl plank. Because floating and wood floors expand and contract with shifts in temperature and humidity, they require a specific gap against the walls; quarter round effectively hides this functional space for a clean, finished aesthetic. Additionally, quarter rounds help bridge minor unevenness or gaps between the bottom of the baseboard and an irregular or undulating subfloor. They protect the lower section of baseboards from accidental scuffs caused by shoes, furniture, or vacuum cleaners, acting as a durable sacrificial buffer while tying the entire room design together cohesively.
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