4mm vs 6mm Corrugated Plastic Signs: When Extra Thickness Matters
When choosing custom yard signs, deciding between 4mm and 6mm corrugated plastic is a simple but important step. The thickness affects how sturdy, professional, and long-lasting your yard sign will be. If you want the best value for everyday use, 4mm is often enough. For tough outdoor jobs, big signs, and windier locations, 6mm thickness can make a real difference.
Understanding Corrugated Plastic Sign Thicknesses
Corrugated plastic (also called Coroplast) is the go-to material for outdoor custom yard signs. It is weatherproof, lightweight, and easy to print in full color. The most common thicknesses are 4mm and 6mm. Here is how they compare:
- 4mm thickness: Standard choice, cost-effective, easy to carry and install, works well for most yard signs up to around 18x24 inches.
- 6mm thickness: Offers extra rigidity, feels more substantial, resists bending in the wind, and is preferred for larger or premium signs.
When to Use 4mm Corrugated Plastic Signs
4mm thick signs are the industry standard for most custom yard signage. They are practical for many uses:
- Political campaign yard signs
- School event signs
- Yard sale and garage sale signs
- Business promotions
- Directional signs for events or parking
- Temporary announcements
We recommend 4mm for regular neighborhood and sidewalk signs, as they are easy to use with standard H-stakes. Legit Fast Printing offers high-quality 4mm corrugated plastic yard signs for almost any application, keeping costs low without sacrificing durability. Many small businesses, real estate agents, and organizations find 4mm more than enough for most campaigns and events.
When 6mm Corrugated Plastic is the Better Option
6mm signs are preferred when you need added strength and stiffness. This matters most when:
- The sign is larger than 18x24 inches or covers a fence or wall
- It will face strong wind, highway exposure, or need to be up for several weeks or months
- You want an extra-rigid, professional look—such as for a real estate listing or premium business sign
- Mounting the sign to a frame or stand, where bowing is a risk
For example, something like a 24x36 promotional sign or a hard-to-miss roadside display will look straighter and last longer in 6mm thickness. We see many customers choosing the thicker option for repeat uses or locations exposed to more weather.
Quick Comparison Table: 4mm vs 6mm Corrugated Plastic Signs
| Feature | 4mm | 6mm |
|---|---|---|
| Best for | Everyday yard signs, real estate, events | Large signs, windy areas, high-end appearance |
| Weight | Very light | Heavier but still manageable |
| Cost | Budget-friendly | Higher |
| Installation | H-stakes or frames | Heavier-duty stakes or rigid mounting |
| Longevity | Great for short- or medium-term use | Better for multi-season/long-term use |
Scenarios for 4mm and 6mm Yard Signs
4mm: Most Common Uses
- Standard 18x24 open house signs in a quiet neighborhood
- School fundraiser or event signs on lawns or entryways
- Directional and informational signage across a festival route
- Temporary business promos or special sales in front of shops
6mm: When to Upgrade
- Big 24x36 contractor or store signs along busy roads
- Permanent or recurring signage for sports fields and public spaces
- Events or campaigns where signs get moved and stored for reuse
- Outdoor banners mounted between posts or buildings needing flatness
Product Example: Custom Printed Plastic Rider Signs
Our custom 18x6 rider signs use 4mm premium coroplast for strong but lightweight performance. These are best for real estate, event add-ons, and short-term promotions.
Sign Sizes and Quantity Recommendations
- Small yard signs (12x9 or 18x12): 4mm is recommended; order 6–12 for coverage at street corners and entryways.
- Standard yard signs (18x24): 4mm fits most use cases; order 10–25 for neighborhood campaigns or events.
- Large signs (24x36 or bigger): 6mm prevents bending and gives a premium look; order 1–5 for key locations or business frontage.
- Directional or parking signs: 4mm is fine unless signs are exposed to heavy wind or handling.
If you are unsure which thickness to choose, feel free to contact the Legit Fast Printing team. We help you select the most practical size and quantity for choosing the right yard sign every time.
Placement Best Practices for Maximum Impact
- Install yard signs so the main message faces incoming traffic or your target audience.
- Place in clear sight, away from trees and tall grasses that can block the view.
- Avoid tight wind tunnels or corners exposed to constant gusts, especially with lighter 4mm signs.
- For larger signs with 6mm material, use stronger supports such as fence posts or backboards for stability.
- Keep signs low enough to avoid being bent by strong wind, but high enough to be seen over parked cars and landscaping.
- For multi-location campaigns, spread signs at key intervals to ensure broad coverage rather than clustering them.
For specific use cases such as real estate or directional event signage, we offer more placement tips in our guide: Real Estate Sign Riders Explained.
Design Considerations for Legible and Effective Signs
- Keep your message short; 5–7 words work best.
- Use bold, simple fonts for easy visibility.
- Choose contrasting colors for background and text.
- Prioritize key contact or call-to-action information.
- Leave enough blank space around text and graphics.
- For large signs, bigger text and fewer elements usually increase readability.
If you have questions about artwork or want help with your layout, upload your own design or get free design assistance from our team at Legit Fast Printing for a polished, professional result.
How Long Do 4mm and 6mm Yard Signs Last?
Both thicknesses are designed to be weather-resistant and suitable for short or long-term outdoor use. 4mm signs will last many weeks to months for typical events or business promotion. 6mm signs are sturdier and can remain in place season after season, especially if properly installed. Actual life depends on weather, placement, and whether they are reused for multiple events.
Step-By-Step: Ordering the Right Corrugated Plastic Yard Signs
- Decide on your main goal: is it a short-term event, a recurring campaign, or a permanent message?
- Determine the sign size. Standard sizes are 18x24 for yard signs and 24x36 or above for bigger roadside signs.
- Choose 4mm for everyday use and 6mm for bigger, longer-term, or wind-exposed spots.
- Calculate quantity based on locations needed—remember, one sign per street corner or event entrance usually handles visibility.
- Prepare your artwork or request free help from us. Upload ready designs or let the Legit Fast Printing team assist you.
- Check available stake or mounting options for your sign type and placement.
- Order and review the final proof before your signs go to print.
Following these steps helps ensure your signs stay readable, last longer, and give you the best return on your signage investment.
Frequently Asked Questions (FAQ)
Is 6mm corrugated plastic always better?
Not always. Use 6mm for large, windy, or premium displays. For most everyday yard signs, 4mm gets the job done at a better price point.
Will my 4mm yard sign work for real estate listings?
Yes, 4mm is the industry standard for real estate and campaign signs because it is light, affordable, and easy to install.
How do I choose between 4mm and 6mm if I want to reuse my signs?
If you plan to use the same signs for several months or move them between locations, 6mm is a safer choice for its extra durability.
Do I need a special stake or frame for 6mm signs?
Most standard stakes work, but for larger or heavier 6mm signs, consider reinforced stakes, frames, or attaching to posts, especially for 24x36 and up.
What is the most common mistake with yard sign orders?
Ordering too few signs or choosing a sign that is too small for the viewing distance. Make sure your message is readable at a glance, and consider your traffic pattern before ordering.
How many signs should I order for a typical yard campaign or event?
For an event or small promotion, 6–12 signs usually covers key entry and exit points. For a neighborhood or school campaign, 10 to 25 ensures good awareness. For big marketing pushes or elections, 25+ signs are common for wider coverage.
Where can I get help with my yard sign design or order?
Our team at Legit Fast Printing provides advice, design guidance, and fast turnaround for any yard sign project. Visit our design help page for more.
Summary and Takeaway
Choosing between 4mm and 6mm corrugated plastic is about balancing cost, durability, and the needs of your custom yard signs. 4mm is the tried-and-true answer for daily use, but 6mm offers peace of mind when conditions or presentation matter. Focus on picking the right size, planning placements, and ordering enough signs for your goals. If you need a hand selecting the right options or want to start a new project, Legit Fast Printing is here to help.
Ready for yard signs that make your message stand out? Order custom yard signs online with Legit Fast Printing for expert support, clear communication, and fast delivery tailored to your needs.