If you have been looking for building signs, you have probably seen the term “FCO” on quotes or architectural diagrams. In the sign industry, we use acronyms constantly, but for a business owner, it can be confusing.

Here is the simple breakdown: FCO stands for Flat Cut Out.

It refers to individual letters or logos that are cut from a flat sheet of material (like metal or acrylic) and mounted to a wall. Unlike “Channel Letters,” which are hollow cans that light up from the inside, FCO letters are solid, flat, and rely on external lighting or their own dimensional depth to stand out.

Because these letters are cut from flat sheets using our CNC routers or lasers, we can fabricate them from almost anything. Here are the top 3 materials we use at Innovative Sign Systems:

1. Acrylic: The most versatile option. It comes in many standard colors, or we can paint it to match your exact brand colors. It has a glossy, glass-like edge that looks very high-end.
2. Aluminum: The most durable option. Perfect for outdoor signs in San Diego because it won’t rust. We can brush the metal for a silver finish or paint it.
3. PVC / Foam: The budget-friendly option. These are lightweight and great for interior lobby signs, but we generally don’t recommend them for long-term outdoor use in harsh sun.

The “magic” of FCO letters is often in how we install them. We usually use a method called “Stud Mounting.”

• Flush Mount: We apply adhesive and studs (pins) to the back of the letter and push it tight against the wall. This looks clean and traditional.
• Standoff (Spacer) Mount: We slide spacers over the studs so the letters “float” off the wall by 1/2 inch or more. This creates a natural shadow behind the letters, giving your sign more depth and readability—especially when the sun hits it.

FCO Letter Weight, Size & Mounting Guide

The table below is a general reference for how material and letter size affect weight and the recommended mounting approach. Actual specs vary by fabricator and letter design—always confirm engineering with your sign contractor before installation, especially for elevated or heavy installations.

Material	Letter Height	Approx. Weight	Recommended Mounting
Acrylic	Under 12"	Light	Flush mount, adhesive + pins
Acrylic	12–24"	Light–Moderate	Flush mount, adhesive + pins; standoffs optional
Aluminum	Under 12"	Light–Moderate	Flush mount or standoffs
Aluminum	12–24"	Moderate	Standoffs with structural backing recommended
Bronze	Under 12"	Moderate–Heavy	Standoffs with mechanical anchoring
Bronze	12–24"	Heavy	Standoffs with structural backing, mechanical anchoring required

Bronze and larger aluminum letters weigh significantly more than acrylic and should never rely on adhesive alone—mechanical anchoring into structural backing is required. Improperly mounted heavy letters create a real safety and liability risk if they detach.

• Classy Aesthetic: They look architectural and permanent.
• Cost-Effective: Because they don’t require internal LED wiring like channel letters, they are often more affordable.
• Versatility: We can cut letters as small as 2 inches or as tall as 4 feet.

Whether you need a sleek acrylic lobby sign in Carlsbad or durable aluminum letters for a warehouse in Escondido, FCO letters are a fantastic choice.