People install quarter round molding against their baseboards primarily to cover the necessary expansion gaps that must be left around the perimeter of floating floors, such as hardwood, laminate, or luxury vinyl plank. Because these types of flooring materials expand and contract significantly with seasonal changes in temperature and humidity, they require room to move without buckling or warping. The quarter round acts as a clean, flexible transition piece that hides this functional gap while remaining attached exclusively to the baseboard rather than the floor. Additionally, quarter round helps mask any irregularities, unevenness, or gaps where a crooked subfloor meets the bottom of the baseboard, providing a polished and professionally finished aesthetic to the entire room.
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