Splicing Into Existing Trim

By Robert Robillard on How To

 Splicing Into Existing TrimSplicing Baseboard Trim – A Carpenter’s Tip

I love rules of thumb and quick tips!   Here’s a quick tip that can be used when remodeling and you need to cut in a miter or splice along a length of existing trim board.

Why would you need to use this, well here’s a few examples:

  1. Cutting out rot and installing a new piece of exterior trim board, window casing or water table trim.
  2. Cutting into baseboard trim when closing off an opening or adding a wall
  3. Rounding a new corner and cutting existing base trim for a new miter joint [see photos]
  4. Installing a scarf joint in anything existing

When installing moldings—particularly baseboard, shoe, crown, and chair rail—it’s always better to use a single length to span the room, but that is not always the case. There have been many cases where existing trim is custom,  antique, or to involved to simple rip it out and install a full length.

Splicing Into Existing TrimScarf Joints

When you do have to splice together molding pieces, we like to use a scarf joint. A scarf joints hides better when panted and leaves a less conspicuous gap when wood shrinks.   To make a scarf joint, we bevel-cut the molding ends to 30 degrees, apply glue, then secure the joint with finish nails.

Scarf Joints and Miter Jig

When cutting trim in place we use a jig with the bevel desired on it.  We cut the bevel for this jig on a miter saw and then use it as a cutting guide with our multi-tool.

In the photos depicted we had cut an opening in a wall and decided the save the trim.  In order to install a mitered look we used our jig to cut a 45-46 degree bevel.  Works like a charm!



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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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