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What Diamond Plate Thickness Should I Use For Trailer Flooring?

When building out your trailer, it’s very important to know the right thickness for safety. Flooring for trailers should be anti-slip reliable, and durable. With aluminum diamond plates, they offer the perfect balance of durability and aesthetics.

Plus, there are many benefits to using aluminum diamond plates for trailer flooring:

  • Corrosion-resistant
  • Anti-slip
  • Weather-proof
  • Easy to clean
  • Simple and quick install
  • Adds a sleek, modern look to your trailer
  • Great for indoors and outdoors
  • Has all kinds of applications from decorative to functional

What thickness should I use for flooring?

Well, it depends. We always recommend putting plywood down first. The popular thickness would be 3/4″ of some kind of wood. If you do have that, then we recommend going with 0.045″ or 0.063″ (1/16″). The more structure and support you have on the bottom, the thinner you can go. 0.045″ would be the thinnest we recommend.

If you don’t have a strong support on the bottom or you have beams, then you should go thicker. The most popular thicknesses would be 0.188″ (3/16″) or 0.125″ (1/8″), and even 0.25 (1/4″).

So it all depends on the flooring you put down before. Always take that into consideration when determining the thickness you need. The thicker the support, the thinner you can go.

For example, the picture above had metal frame, so you could go thinner or thicker. But it also depends on what you’re lugging. In this case, this customer lugs around quads and machinery, so he needed 0.125″.

The example below shows one of our customers that bought 0.063″ because he already laid plywood down and the aluminum diamond plate also fits on top of the the metal frame.


How do I install it?

Depending on the thickness of diamond plate and support under it, that will determine how long your fasteners will be.

Tools Needed:

  • Self-tapping tin screws
  • Impact Drill

Screw along the edge of the sheets. You can also screw down the middle of the sheets to prevent rattling and for more security. If you have two sheets that meet, don’t forget to screw the edges of both sheets.

Where Do I Buy Aluminum Diamond Plate?

If you’re looking to buy some aluminum diamond plates, click here. We are located in Southern California, but we ship nationwide for a flat rate of $195 up to 50 sheets. Our aluminum diamond plates are hot-rolled, making them perfect for fabrication. We offer them in full sheets and custom sizes for all parts of a trailer. From stone guards and flooring, to wall wainscoting.

If you have any questions or trouble deciding what thickness of aluminum diamond plate you need for your trailer, give us a call at (800) 935-1973 or email us at [email protected]. We are here to help! We ship flat rate nationwide!

SizeMetal is a leading distributor of sliced metal sheets. We offer aluminum diamond plates, aluminum sheets, stainless steel sheets, and accessories.


1900 Proforma Ave, Unite G-2, Ontario, CA 91761

(800) 935-1973

[email protected]

11 thoughts on “What Diamond Plate Thickness Should I Use For Trailer Flooring?

  1. Aluminium Fabrication Auckland says:

    Choosing the right diamond plate thickness for trailer flooring is crucial for safety and durability. I couldn’t agree more with the recommendation of using 0.045″ or 0.063″ thickness, especially when supported by a sturdy plywood base. The versatility of aluminum diamond plates, offering corrosion resistance, anti-slip properties, and a sleek aesthetic, makes them an excellent choice for both indoor and outdoor applications. It’s fascinating how the thickness depends on the support structure; the more robust the foundation, the thinner you can go. Also, considering the load you’ll be carrying is essential. And let’s not forget the artistry of aluminum fabrication, transforming this material into functional and appealing structures with precision and skill!

  2. Jeff Myers says:

    Hi. I’m rehabbing my flat bed trailer. It’s 6’ x 12’ C channel frame with 1/4 angle steel beams 24” on center. It’s alway had a plywood floor but I’m tired of replacing it due to rot. Would 1/4” aluminum diamond plate by itself be enough? Would I need to put angled steel along the frame around the perimeter or would the beams be enough to span the edges? I use it to haul stuff to the dump and construction materials. Thank you.

    • admin says:

      Hi Jeff! Thank you for reaching out. Yes, 1/4″ aluminum diamond plate would work perfectly for you. As long as there are beams to support the material you should be more than fine. Of course, having angled steel along the frame would be extra reinforcement and offer peace-of-mind.

  3. Richard Bell says:

    We have a business that installs all types of options for cargo trailers.
    Everything from flooring to pet vacuums . We customize cargo trailers. I would like to get all the pertinent literature and pricing for the materials your company offers.

  4. Sue says:

    I would like to know if 4’x8’ 1/4 diamond plate sheets can be bought and how much it would be, the cheapest pattern if there’s a difference and how much a 4x 8 foot 1/4 sheet weighs. Thank you trailer flooring

  5. Stuart says:

    I’m just wondering what is the best thickness to have for my trailer floor, I carry large logs in it, however the original wood floor has become rotten through water damage. SO really, I just want the floor to be metal, ( ie checker plate or diamond plate), this is so there is no problem in the future with water damage.
    The size of the floor is 4ft x 6ft 5. I have been recommended that 3mm may be thick enough. What do you think. Thank you for your help.

    • admin says:

      Hi Stuart, thank you for getting in touch with us! We would recommend the thinnest be 3/16″ or 1/4″. Your best bet would be the 1/4″.

  6. Harper Campbell says:

    It’s interesting to know that when it comes to using diamond plate for flooring in a trailer, that there are ways to determine what the thickness needs to be. I like how you pointed out that if there isn’t a strong support on the bottom that thicker is probably the best choice for that situation. This is something that I am going to let my husband know when he gets to that point in rebuilding our bike trailer.

    • admin says:

      Hi Harper,

      Thanks so much for commenting! Let us know how we can help with your future project! We are always here for your aluminum diamond plate and stainless steel needs!

      Have a great day!

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