Adding crown molding to your wall is sure to give any room that upscale look. If you’re installing molding yourself, coping it is a great way to create smooth, tight inside corners without any gaps. Coping your crown molding isn’t tough, and it should only take you 5 to 10 minutes per board. Grab your coping saw and pencil to get started!

Question 1 of 7:

What is coping?

  1. It’s cutting the molding's profile to fit the pieces snugly together. Unless your walls are exactly 90-degree angles in each corner, miter cuts might not be tight enough to fit your molding together perfectly. A coping cut removes the excess wood behind the edge of the miter cut to butt the pieces up together.[1]
    • A miter cut is an angled cut that you’d normally use for corner pieces of molding. While a miter cut is usually fine for corners that are perfect 90-degree angles, they often aren’t enough to snugly fit molding pieces together.
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Question 4 of 7:

What’s the best way to cope crown molding?

  1. 1
    Darken the edge of the miter cut with a pencil. Hold the piece of molding with the front facing you and grab a pencil. Gently rub the pencil on the very top edge of your miter cut to create a guideline.[4]
  2. 2
    Undercut the edge of the molding with a coping saw. Place the molding on a table or countertop and let the miter cut edge hang off the end. Hold the molding in one hand and grab your coping saw in the other. Carefully cut down the darkened edge at a 45-degree angle to the molding, scooping out the wood behind the edge that you drew on, but leaving the front part of the molding intact. Go slowly and carefully, and try to follow the curves of the molding as you go. Molding that has been coped looks completely normal from the front, but it has a 1 in (2.5 cm) wide section of wood missing from the back.[5]
  3. 3
    Sand the edges of the cut before installing. Use 100-grit sandpaper to gently smooth down the edges of the cut you just made. This is an important step for the overall look of your molding, so don’t skip it![6]
    • When you’re working with 2 corner pieces of molding, you only need to cope 1 of them.
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Question 5 of 7:

Can you cope crown molding with an angle grinder?

  1. Yes you can, although it takes some precision. If you don’t have a coping saw, place your crown molding on the edge of a table or workbench. Hold your angle grinder in one hand and keep the molding steady with the other. With the angle grinder at a 45-degree angle to the edge of the molding, gently press in and undercut the edge, but don’t touch the front of the molding. Take off about 1 in (2.5 cm) of wood from the profile of the molding, leaving the front edge intact.[7]
    • As you encounter bends and curves in the molding, tilt your angle grinder to accommodate the wood.
Question 6 of 7:

How do you install coped crown molding?

  1. 1
    Install the square cut or miter cut molding first. Whichever piece of molding you didn’t cope is the one you want to put up first. Use a nail gun to attach the molding to the wall, spacing your nails about 6 in (15 cm) apart. Then, double check that your coped piece fits snugly against the piece you just installed.[8]
  2. 2
    Butt the coped molding up against the square-cut molding. Gently push the coped molding up against the square cut or miter cut you already installed. Use your nail gun again to attach the molding to the wall, spacing them about 6 in (15 cm) apart.[9]
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About This Article

Alberto DeJesus
Co-authored by:
Construction Specialist
This article was co-authored by Alberto DeJesus and by wikiHow staff writer, Hannah Madden. Alberto DeJesus is a Construction Specialist and the CEO of DeJesus Industries. With more than four years of experience, he specializes in high-end real estate development and construction. Alberto and DeJesus Industries have been featured on NBC News and have worked with numerous well-known companies, including Mazda, Amazon, and CVS. Alberto holds a Bachelor’s degree from Boston University. This article has been viewed 36,315 times.
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Co-authors: 14
Updated: March 22, 2023
Views: 36,315
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