In the sign industry, dimensional letters are individual letters, numbers, or logo shapes manufactured with physical depth that stand off or project outward from a wall or sign face. Also known as raised or 3D letters, they are unilluminated units distinct from flat vinyl graphics or internally lit channel letters.
Types of Dimensional Letters
Fabrication methods determine how the depth of the letter is achieved based on the material used.
- Flat-cut: Cut from flat sheet stock like acrylic, aluminum, or PVC using a CNC router or laser. Flat-cut depth is limited by available sheet thicknesses.
- Fabricated: Hollow metal letters built with face shapes welded or soldered to bent metal sides (called returns) to create depth without the heavy weight of solid plate.
- Cast or formed: Made from molten cast metal like aluminum or bronze, or thermoformed plastics.
- Laminates: Thin metal or acrylic faces bonded to lightweight foam or PVC cores.
Installation and Mounting
Dimensional letters are attached to walls or backer panels using various methods. Installers often use threaded studs drilled into the wall, which can be flush or spaced out with standoffs. Adhesives and pad mounts are also common. Installation requires a full-size drill pattern to ensure exact spacing and alignment.
Cost Drivers and Specifications
Several variables dictate the final specifications of a dimensional letter project. Cost drivers include the material substrate, the letter stroke thickness and depth, and overall sign dimensions. Custom finishing options, such as painted custom colors, brushed metal, or anodizing, also affect the scope. External factors like installation height and the wall surface material impact mounting requirements. Sign permits and regulations regarding maximum projection from building facades vary by municipal sign code, though electrical permits are generally exempt unless external dedicated illumination is added.
Sign codes change and vary by zoning district and overlay. Confirm with the authority having jurisdiction before submitting a permit.
Frequently Asked Questions
What is the difference between dimensional letters and channel letters?
In professional sign manufacturing, dimensional letters are strictly unilluminated units. If they are engineered with internal LED illumination, they are classified as channel letters. You can review the differences in this guide on channel letters vs dimensional letters.
Can dimensional letters be seen or lit at night?
Because dimensional letters lack internal lighting components, they require external light sources to be visible at night. Installers often use external gooseneck lighting or ground-based spotlights to illuminate the sign face and cast shadows.
How do you mount dimensional letters to uneven surfaces like brick or stone?
For uneven surfaces, installers typically use threaded studs. These metal rods attach to the back of the letter and slide into holes drilled directly into the mortar or stone. Spacers can slide over the studs to keep the letters sitting perfectly plumb.
How can a sign company quickly show clients what dimensional letters will look like on a building?
Vuely is AI sales software for sign companies. A rep visits a customer's site, captures a survey with photos and measurements, and Vuely generates a photo-accurate mockup of the sign on the customer's actual building, checks the design against the local city sign code, estimates price, and collects a signature before the rep leaves.
Vuely is AI sales software for sign companies: site surveys, mockups on the customer's own building, and sign code checks before the quote goes out.