quarterround

Quarter-round, sometimes written as quarter round or quarterround, is a type of interior trim used in carpentry and architecture. It is a low, concave molding with a cross-section that forms a quarter circle, hence the name. The profile is designed to cover the joint and gap where the floor meets the baseboard, while also providing a rounded edge for a clean finished look.

The molding is available in a range of sizes and thicknesses to match different baseboard profiles and floor materials. Common materials include wood (such as pine or maple), medium-density fiberboard (MDF), and synthetic alternatives like vinyl or PVC. The touch and durability vary by material, with wood offering finish options and the synthetics providing moisture resistance and lower cost.

Installation typically involves placing the quarter-round on the floor with the curved edge against the baseboard and securing it with nails or adhesive. Corners are joined with mitered cuts, and joints are finished with wood filler or caulk to create a seamless appearance. It is often used in conjunction with baseboards to hide small gaps along the floor and to produce a neat transition at doorways and along walls.

Related trim types include shoe molding and other baseboard profiles, which offer different radii and levels of coverage. Quarter-round remains a common, simple solution for finishing interior edges and improving the appearance of floor-to-wall transitions.