Popsicle Sticks

Not all popsicle sticks are equal

If you have been given a project of building a popsicle stick bridge, there is something you should know. Probably one half of the popsicle sticks that come from Wal-Mart or other store are bent, twisted, or otherwise deformed. And obviously deformed popsicle sticks won’t be as strong as straight ones. If you don’t pay attention to what popsicle sticks you are putting on your bridge, you could end up with a weak bridge.

Examine the popsicle sticks

Simply looking at the popsicle sticks will give you a good idea on which ones are good and bad. I normally start sorting the popsicle sticks into two piles. All the popsicle sticks I definitely will not use go into one pile, and the better ones into another pile.

You want to eliminate popsicle sticks that are bent, twisted, or have knots. Twisted popsicle sticks are a big problem because they don’t glue flat to each other. This creates a much weaker joint. Some popsicle sticks are shaped in a “U” down their entire length. It could be said these popsicle sticks are shaped like a trough. These are almost as bad as twisted popsicle sticks for the same reason.

Bad Characteristics:

  • Knots
  • Twisted
  • Bent
  • Bad grain structure

Sorting the popsicle sticks

I mentioned above that I make two piles of popsicle sticks: a “bad” pile and a “good” pile. And if I want the bridge to be extremely strong, I split the “good” pile into two new piles. In this second round of sorting, I will examine the grain structure of each popsicle stick, and make sure that each one is perfectly straight. The extra time taken ensures I will have the best of the best popsicle sticks.

Grain Structure

The grain structure on popsicle sticks can be hard to see. But if you really want the absolute best sticks, you need to consider the grain. You want the grain to be parallel to the stick, and not on a diagonal. This is especially important for popsicle sticks that will be in tension.

How much does a popsicle stick weigh?

I found the average weight of a popsicle stick to be 1.49 grams. To find this average, I weighed 71 popsicle sticks picked randomly from my box of 1000 and weighed them with my gram scale.

25 thoughts on “Popsicle Sticks”

  1. Garrett,
    I am a teacher in a rural school district in WI and one of the classes I teach is called ¨Cardinal Innovation¨, essentially a Makerspace. We were starting a class challenge the week before schools were closed, due to Covid 19, and the class challenge was a bridge building contest. Bridges had to be able to span a 15 inch opening between tables, width was up to one popsicle stick length, and height was no more than 12 inches tall. Now, I will be sending the materials home to each student in my two classes for them to complete as an individual project (we were originally doing in teams). My question for you is which size of popsicle stick do you prefer or suggest to use? The narrow 4 3/8¨ x 3/8¨ stick or the wider 6¨x 3/4¨ stick. I have enough of each size to send home either size to each student. I could send one section the longer wider sticks and the other class the narrow shorter sticks and then do a comparison between the classes. Thoughts?
    Thanks
    Pete Lowery
    MS Math & Cardinal Innovation
    Necedah, WI

    Reply
    • Hi Pete,

      I’ve actually only used the more narrow sticks when building model bridges. I think this is mainly because I like how they look compared to the jumbo sized ones.

      I’m not sure if you are eventually planning to test the strength of their bridges, but if so the larger sticks will have a distinct advantage because they have more surface area for the glued joints.

      But other than that, I think either option would be just fine. I actually like your idea to send different sizes to each class in order to compare.

      Best of luck, and thank you for your investment into the students!

      Reply
  2. How much is the width of the popsicle stick? Well, if you dont know the answer, could you tell me how much popsicle sticks that I need if I am going to glue on a 30×30 cm cardboard?

    Reply
  3. Please Help Me, its Urgent!!!
    I am building a popsicle stick bridge for a science fair. Requirements: The bridge must be 90 cm long, 7-9 cm wide, and no taller than 15 cm. It also needs to be less than 200 grams. What design would you recommend for this bridge? I’ve tried some but they don’t seem to be strong enough to hold 100 lbs or more. I would really appreciate your help, thanks.

    Reply
    • That’s a hard design. Here is a bridge I built using only 40 popsicle sticks. But it was only 13 inches long, and held 90 pounds over a span of 12 inches. You could use a similar design but make it slightly longer.

      Reply
  4. i need blueprints that i can print out or something cause i have a school project and it has to be 14 inches and can suport up to 110 pounds help please

    Reply
  5. As a parent whose kid doesn’t remember or take notes on “the” project your website was a life saver!!! The classroom instructions had the basics but I needed much more information
    I find out today how well our bridge went.
    Thank you for putting the information on the internet.

    Jane

    Reply

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