Summer sun and winter cold move every sign panel. The right material moves without warping, cracking or pulling loose.
The best outdoor sign materials for New Jersey and New York City are the ones that cope with a wide yearly temperature swing. A sign that sits in freezing wind in January faces strong summer sun in July, and a dark sign face in direct sun runs far hotter than the air around it. Every material expands and contracts with that heat, and the difference between a sign that lasts and one that warps is how much it moves and whether it was mounted to allow for it.
This guide compares the common outdoor sign materials, explains where each one works, and ends with a short way to choose. For how long finished signs typically last, see our guide on how long commercial signs last.
Outdoor Sign Materials at a Glance
| Material | Best outdoor use | Main weakness |
|---|---|---|
| Aluminum composite (Dibond) | Permanent wall signs, tenant panels, large flat signs | Flat panels only, and cut edges need finishing |
| Solid aluminum | Parking, property, directional and reflective signs | Gets heavy in large sizes |
| Acrylic | Dimensional letters, lit faces, standoff panels | Moves more than metal and can crack on impact |
| Polycarbonate | Light box faces within reach of the street | Costs more and scratches more easily |
| Expanded PVC (Sintra) | Small, light colored or shaded signs | Softens and warps in strong heat |
| Coroplast | Yard, job site and event signs | Short life, flexes in wind |
| Carved HDU or wood | Carved and dimensional signs | Depends on a good paint system |
Aluminum Composite (Dibond)
Aluminum composite is two thin aluminum skins bonded to a plastic core. It stays flat, resists corrosion and is light for its size, which is why it is the first panel we reach for when a business needs a flat outdoor sign that will stay up for years. 3A Composites, the maker of DIBOND, rates it for both deep winter cold and high summer heat and reports very long outdoor service lives. That durability matters for outdoor signs on the Jersey Shore, where salt air is hard on lesser materials.
Because it moves much like solid aluminum, a large panel only needs standard fasteners and a modest expansion gap. See our Dibond Signs page for printed and routed panel options.
Solid Aluminum
Solid aluminum sheet does not rust, takes paint and reflective film well, and survives a car door or a snow shovel better than any plastic. That is why it is the standard for parking, regulatory and directional metal signs on lots and properties.
Thicker sheet is stiffer but heavier, so it suits small and mid sized signs. For a large wall panel, aluminum composite gives a similar metal face for much less weight. See our aluminum signs page for gauge options.
Acrylic and Polycarbonate
Acrylic is the better looking material, with clean polished edges and excellent light transmission, which suits dimensional letters, standoff signs and lit faces mounted out of reach. Polycarbonate is far tougher against impact, so it is the safer face for light boxes near the sidewalk or anywhere a thrown object is a real risk.
Plastics move several times more than metal with temperature, and ACRYLITE advises allowing extra room for dark colored sheet. Screwed tight through round holes, an acrylic panel will bow in summer or crack around the fasteners in winter, so it needs oversized holes, standoffs or a channel frame. See our Acrylic Signs page for mounting options.
Expanded PVC (Sintra)
Expanded PVC is light, easy to cut and prints well, which makes it popular for small exterior signs. Its weakness is heat. PVC has a low service temperature, and a dark PVC sign on a sunny south or west wall can pass it on a summer afternoon and start to warp.
It works outside when the sign is light colored, modest in size, and shaded or facing north, mounted through slotted holes so it can slide as it expands. If any of those conditions fails, aluminum composite is the safer choice. See our Sintra Signs page for sizes and finishes.
Coroplast
Corrugated plastic is the right call when a sign only needs to last a season or so, for real estate, events and job site signs. It costs little, shrugs off rain and is light enough to stake into a lawn, but it flexes in strong wind and its print fades faster than on metal. See our Yard Signs page for stake and size options.
Carved HDU and Wood
High density urethane gives the look of carved wood without rot or insects, and it holds fine detail when routed or hand carved. Exterior grade wood gives real grain in exchange for more upkeep. Both depend on a proper primer and paint system for sun protection, and wood needs sealed edges and periodic repainting. See our Carved Signs page for finishes.
Boards That Do Not Belong Outdoors
Foamboard, Ultraboard, standard Gator Foam, styrene and MDF are interior display materials. They swell, delaminate or warp when they meet rain and sun. If a quote for a permanent outdoor sign lists one of them, ask why, because it will usually be replaced within a year.
Weight Matters in New York City
In New York City, a sign’s size and weight decide who may hang it. The Department of Buildings requires a licensed sign hanger for signs above a modest size or weight, so on a borderline sign a lighter panel such as aluminum composite can simplify the installation. In New Jersey, size and lighting limits come from each town’s ordinance, covered in our guide to understanding local sign regulations.
How to Choose the Right Material
- How long must it last? Under a year, Coroplast is usually enough. For several years or more, choose aluminum composite, aluminum, or properly mounted acrylic or polycarbonate.
- What color, and which wall? Dark colors on sunny walls rule out PVC and need extra expansion room for acrylic.
- How big is it? Large flat signs favor aluminum composite over solid aluminum because of weight.
- Is it lit, and can people reach it? Lit faces within reach of the street favor polycarbonate.
Common Questions About Outdoor Sign Materials
What is the most durable outdoor sign material?
For flat signs, aluminum composite and solid aluminum. Both resist corrosion and temperature swings, and the print or paint on them usually wears before the panel does.
Can PVC signs be used outside in New Jersey?
Yes, within limits. Light colored, smaller or shaded PVC signs mounted with room to move hold up well, but dark PVC on a sunny wall often warps in summer.
Is acrylic or polycarbonate better for a light box?
It depends on reach. Acrylic looks cleaner and suits faces mounted high, while polycarbonate resists impact far better for faces near the sidewalk.
How long does a Coroplast sign last outdoors?
Usually a season or two. Sun, wind and how it is mounted make the biggest difference, so it suits temporary signs rather than permanent ones.
Why did my outdoor sign warp?
Most often because the material could not take the surface heat or was screwed down too tightly to expand. Dark colors on sunny walls make both problems worse.
Does the material affect the permit?
Sometimes. Towns regulate size, placement and lighting rather than material, but in New York City a heavier sign can change who is allowed to install it.
Outdoor Signs Built for This Climate
Gogi Signs chooses and fabricates outdoor sign materials in our Linden shop for businesses across New Jersey and New York City, matching each panel to the wall, the sun and the local rules after a site survey.
See our Sign Fabrication page for how we build, then request a free quote with a photo of the wall.
