How to Build Perfect Two-Piece Arch Trim (Step-by-Step) In this video, we walk through the process of building custom two-piece arch casing using pre-milled radius components. Instead of cutting each piece individually, we preassemble the flat stock and back band into one unit—saving time, improving accuracy, and making installation much easier. We start by gluing and fastening the oversized pieces together using construction adhesive and screws, creating a single, solid arch component. This method allows for cleaner cuts, better alignment, and a more efficient workflow compared to assembling everything piece by piece.

How to Build Perfect Two-Piece Arch Trim (Step-by-Step)

In this video, we walk through the process of building custom two-piece arch casing using pre-milled radius components. Instead of cutting each piece individually, we preassemble the flat stock and back band into one unit—saving time, improving accuracy, and making installation much easier.

We start by gluing and fastening the oversized pieces together using construction adhesive and screws, creating a single, solid arch component. This method allows for cleaner cuts, better alignment, and a more efficient workflow compared to assembling everything piece by piece.

Using a laser for layout, we dial in a consistent reveal and simplify marking by only referencing key points on each side—no need to mark the entire arch. From there, we cut and align the radius segments, joining them together with glue and pocket screws to create a clean, seamless arch.

We also cover:

• Why preassembling trim pieces leads to better results
• How to use lasers for precise layout and cuts
• Tips for joining segmented arches without complex clamping setups
• Adjusting for reveal and alignment during installation
• Real-world considerations like grain matching and job consistency

While some may prefer a single-piece arch for continuous grain, this segmented method matches the rest of the house and delivers a clean, professional look with far less complexity.

By the end, you’ll see how efficient this approach is—allowing you to move the entire arch as one piece, fine-tune your reveal, and install with confidence.

If you have your own tips, tricks, or questions, drop them in the comments below. See you in the next one.

We also cover: • Why preassembling trim pieces leads to better results • How to use lasers for precise layout and cuts • Tips for joining segmented arches without complex clamping setups • Adjusting for reveal and alignment during installation • Real-world considerations like grain matching and job consistency While some may prefer a single-piece arch for continuous grain, this segmented method matches the rest of the house and delivers a clean, professional look with far less complexity. By the end, you’ll see how efficient this approach is—allowing you to move the entire arch as one piece, fine-tune your reveal, and install with confidence. If you have your own tips, tricks, or questions, drop them in the comments below. See you in the next one.