Marking and Cutting Radius Trim

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Marking and cutting radius trim can be tricky, and mistakes can be costly. This expert has a super simple method.

How to mark and cut radius trim

I’ve never been good at math so when it is time to install eyebrow/radius casing trim, instead of reaching for a calculator, I just make a full- scale layout table. Drawing on a piece of MDF works best for me. Here is how I do it:

Step One: Draw parallel lines

First, I draw a set of parallel lines representing the inside and outside edges of the side casing trim. I space them the same width of my jamb opening plus 1/ account for the two 1/4-in. reveals.

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