A Back Cut is Commonly Used When Installing Trim
By Mark J. Donovan
||Question: Mark, In your video on “How to Cope Inside Corners with a Coping Saw” you mention a term I am not familiar with, “back cutting”. Can you please clarify what back cutting accomplishes?
Answer: E.M., when installing any type of trim molding, such as baseboard trim or crown molding, back cutting is a commonly used method for ensuring perfectly tight joints along the front edges of the seams. The process of back cutting can be done using a coping saw or miter saw, depending upon the type of cut you are making, e.g. a coped cut or a mitered cut.
The process of back cutting simply involves cutting a little more off the back side of the cut so that there is less material towards the rear edge of the trim piece.
By removing slightly more material from the back side of the trim piece when making the cut you ensure that the front side extends out such that only the front edges of the two adjoining pieces of trim actually touch. This enables a tightly joined seam.
Yes, there will be a slight gap towards the back, however you can minimize the gap by limiting the back cut to just under 46 degrees. Also, caulk or wood filler will hide any slight gap towards the back of the cut.
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Additional Finish Carpentry Resources from Amazon.com
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