Marking and Cutting Radius Trim
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 1/2-in.to account for the two 1/4-in. reveals.
Step Two: Make a pair of marks
Next, I make a pair of marks from the top edge of the MDF on the inside casing trim guide lines. Depending on the opening width anything from 6 to 12 inches will work.
Step Four: Draw a line with a straightedge
After moving the radius trim out of the way, I use a straight edge to draw a line through the intersecting points, and that becomes the cut line.
Step Five: Transfer the cut line to the radius trim
From there I put the trim back on my layout table and transfer the cut line to the radius trim.
Step Seven: Check the miters
I always check the miters by laying the pieces back on the layout table. I run the side casing long until I’ve fine-tuned the miters and then cut the bottom ends to achieve the final length.
Watch the video below to see Gary explain this entire process.
Craftsman Builders Inc. is a custom home building company based out of Springdale. It is owned by Gary Striegler with over 40 years in the home building industry. Gary is a second generation home builder specializing in custom interior trim. His goal is to provide a complete custom home that meets and exceeds his clients’ vision
Gary began working with his father as a trim carpenter in 1972 at the age of 14. As the president of Craftsman Builders, Gary is still a hands-on builder. About half of his time is still spent on the job site creating the high end interiors that have become his trademark.
He is a frequent contributor to Fine Home Building Magazine and The Journal of Light Construction. Gary also enjoys teaching on subjects relating to home building. He has made presentations for The Woodworking Show, JLC Live Shows, Woodmaster Tools, Kreg Tools, DEWALT Tools, Grex Tools, and White River. Gary also teaches classes at the Marc Adams School of Woodworking.