Quickly beautify any room with this handy piece of trim
Quarter round trim installation starts with measuring each wall length to the nearest 1/16-inch, then cutting your pieces slightly long for a snug fit.
Expect to pay $100 to $500 for quarter round materials and tool rental, with costs around $1 to $1.60 per linear foot for the trim itself.
You’ll use three key cuts for quarter round installation, straight 90-degree end cuts, 45-degree corner cuts, and coped cuts that trace the trim profile.
Hiring a local carpentry professional helps keep your quarter round installation precise and level, especially for seamless corners and scarf joints, angled splice cuts.
Quarter round is the final piece of built-up baseboard trim. Useful for adding elegance to your home’s trim and hiding unsightly gaps between the floor and wall, quarter round allows room for the floor to expand and contract without exposing its edges. And while it performs an important job, in some cases quarter round is optional.
If you’ve determined your home needs quarter round, here’s how to install it.
Once you have your materials, it’s time to start the installation.
It’s easier to paint or stain trim work before you install it. (If you purchase pre-finished quarter round, you can skip this step.)
Support several pieces of quarter round on sawhorses, workbench, or another sturdy surface. Protect the floor from drips with a drop cloth.
Stain or prime and paint the curved surface of the trim piece. Allow curing overnight if painting.
Measure to the nearest 1/16-inch when using a tape measure. Err on the side of being too long rather than too short.
To master quarter round installation, you’ll need to learn three types of cuts: a butt cut, a 45-degree cut, and a coped join cut.
A butt cut is a cut that’s exactly perpendicular to the length of the quarter round. Set the miter saw angle to zero degrees and line the trim piece up to the saw’s fence to cut.
You’ll use 45-degree cuts for making corners and scarf joints. Set the miter saw’s angle to 45-degrees in the direction you need. Place the quarter round in the saw with one of its flat edges against the fence.
Coped joint cuts create seamless inside corners. To make the joint, cut the end of the trim at 45-degrees so that the cut profile is facing you. With a coping saw or jigsaw, turn the blade away from the angled cut and saw along the leading edge of the profile line.
When complete, you’ll have an end that matches the profile of the quarter round.
Work slowly and carefully if you are staining your quarter round or using pre-finished pieces. There won’t be an easy way to hide mistakes in the end.
Nail through the quarter round and into the baseboard behind it. Avoid nailing into the flooring or subfloor.
Except on outside corners and scarf joints, avoid using glue to install quarter round. You may need to remove the trim later to work on the floor, and gluing will make disassembly difficult, if not impossible.
Make a 45-degree cut facing away from you on the miter saw. Place the piece along the baseboard so that the inside of the cut is at the baseboard’s corner.
Cut an opposite 45-degree angle in another piece of trim. It’s best to cut this piece slightly longer than you need and make several minor cuts until you reach the exact length. In other words, “creep up” on the measurement.
Apply wood glue to the meeting edges and set the second piece in place. Use the nail gun to fire a trim nail through the quarter round and into the baseboard near the corner. Repeat on the other side of the corner and wipe away excess glue with a disposable rag.
There are two ways to create an inside corner, and you may find yourself using both methods.
A simple inside corner joint is the opposite of an outside corner. Cut opposing 45-degree angles in two pieces of quarter round and use a nail through each to install. This method works only for corners that measure precisely 90-degrees.
For corners that don’t measure exactly 90-degrees, make a butt cut in the first piece of quarter round and install it in the corner with the butt end hidden against the opposing baseboard corner.
Make a coped joint cut in the second piece of the corner and install it with the cut end directly against the profile of the opposing quarter round piece. There’s no need for glue on the inside corners.
If a wall is too long for one piece of trim to span the distance, you’ll need to create a scarf joint to extend the length of the trim work.
To do this, make a 45-degree cut facing towards you on the miter saw. Install the piece in place, but refrain from nailing the last couple feet.
Make an appropriate cut on the opposite end from the scarf joint for the second piece. Set the piece in place and mark the scarf joint cut with a fine pencil line. Cut the opposite 45-degree angle. Again, cut the piece slightly too long and creep up on the final cut length.
Apply glue to the joint ends where they meet. Complete the installation by firing a nail directly through the joint and into the baseboard and wiping away excess glue.
For stained or prefinished quarter round, use a small amount of appropriately colored wood fill on your finger to rub into each nail hole.
For painted trim work, fill each nail hole with paintable caulk or wood fill and follow up by touching up the spots with the same colored paint and a small brush.
The cost to install quarter round as a DIY project ranges between $1 to $1.60 per linear foot for material, significantly less than the cost of installing entire baseboards. Renting a compressor and nail gun for about $45 per day is well worth the investment unless you already own one.
There is a slight learning curve, so be prepared to make a few mistakes along the way, but the project isn’t too tricky to master if you have some DIY skills already. However, if you can think of a better way to spend a Saturday, we understand. A local carpenter or a baseboard installer near you can certainly help.
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