Learn How to Flatten Warped Plywood | 9 Best ways

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Plywood is one of the most versatile, widely used construction materials in the world. When plywood is not stored correctly, it can become warped and fail to work for its intended purpose over time due to moisture and temperature changes. This article will discuss why plywood gets warped and how to flatten warped plywood again, so you don’t have to worry about those pesky bumps ruining your next project!

Why Does Plywood Warp?

piece of warped plywood

The most common reason for plywood to warp is due to moisture and temperature changes. The more layers of wood that are in the plywood, the more likely it is to warp–the glue’s ability to hold them together doesn’t have time or space between boards as much as a solid piece of wood does. This can be caused by installing too thickly (you may want less than half an inch) or not using enough adhesive, or both! You also might notice screws passing through from one side into the other making it difficult if you want your project flush with all four sides like a frame around a window.

Know More: How to Transport Plywood Properly | Tips and Tricks

Plywood usually has some sort of water-resistant sealant sprayed on before the top layer, so any moisture that gets in from the environment will be wicked away into the lower layers. All of this is to prevent moisture-related warping, but you can still get it if your plywood has warped before being sealed. It can also get warped when you don’t transport plywood properly. Now we will discuss about how to flatten warped plywood in easy way.

Know More: Learn How to Prevent Plywood From Warping | Tips and Tricks

How to Flatten Warped Plywood? Here is the 8 Best ways

You can not work with a warped plywood comfortably. You can’t even cut them in a perfect shape by using plywood cutting tools. That’s why it is important to make them flatten before using them. Choosing the best way for flattening a plywood can be hard. There are many ways of doing it and you must know what your end goal is before deciding which one will work best for you. The following eight methods cover every scenario imaginable, so no matter how complicated or simple your need may be, there’ll always an answer that suits your needs here at Woodworking Advisor!

Know More: 9 Best Tools For Cutting Plywood in 2022

Flattening Plywood by Using Heavyweight

flattening plywood with heavy weight

Place the plywood on a flat surface, for example, sheet or board flooring. Put weights evenly distributed across the panel so that it is weighted down. The weight should be heavy enough to keep some pressure applied against the edge without bending or damaging the edges of your plywood (dumbbells can also work). Let stand overnight and in the morning, you will see how warped wood becomes flattened!

Notice: For best results, we recommend using this method every day until desired warp has been removed completely.

Flattening Plywood with a Wet Cloth

flattening plywood wet cloth

I’m about to tell you how to flatten plywood with a wet cloth. First, place the wet cloth on top of your work surface and then lay down the board as flat as possible by pushing any bubbles out from underneath it. Next, grab one corner of the square piece and pull it up so that you can wrap some water-soaked material around it for better suction power while holding back onto another side like in an arm wrestle match or tug-o’-war game.

The best way I know how to do this is use these steps: first, take a wet rag [or clean dishcloth] and cover your working area before laying down anything; next, put something solid under what needs to be flattened (usually just boards) until they’re close enough to the surface to not move when you’re pushing down on them; next, take a corner and grab it with both hands so that one hand is pulling up while the other pushes downward. If done correctly, most people can get their boards fairly level after doing everything mentioned here.

Flattening Plywood is Easy with a Steam Iron

flatten plywood with iron

A standard home steam iron can be used to flatten wood and most other materials, including fabric. You will need two pieces of the flat board about the size of your side table or desk: one for pressing down on the material you want flattening and another for holding it in place while heating an area by covering it with the hot surface from below (this should not take more than 30 seconds).

Know More: 5 Best Iron for Edge Banding in 2022

Make sure the area under your workspace is clean and free from any clutter. Put down a few sheets of newspaper to protect furniture or carpeting in case you spill anything, like water, paint or ink. Next, put weights such as old books all around its perimeter before turning on your steamer at max capacity but leaving just enough space for the weight you’re using to balance in the middle of it. Then, place your flattened board over the top and cover that with a wet rag for extra humidity before carefully pressing down on either side until the material is flat.

Flattening Plywood with a Vacuum

layout some old towels or paper bags underneath where you intend on working and then place two pieces of scrap wood lengthwise under both ends as supports – this should help prevent any possible damage occurring from overhanging edges dragging along cement during transport. Slide your first piece onto these makeshift rails before flipping it upside down and placing the second piece on top.

-Bring your vacuum cleaner over and start vacuuming one side of the plywood. Do this for approximately two minutes before changing sides, repeating until you’ve done all four sides and then move to a different section – if it’s likely that your floor is uneven or there are any ridges in it, it is best to do the vacuuming in a different order every time.

Next up place your wood on top of some blocks or scrap pieces of plywood that are around six inches high and start at one edge, using any kind of sharp object (such as a table knife) to push down into the warped surface – be sure not to let this cut through all the way because you want an indentation but not something so deep that it will leave marks behind. Now flip over onto its other side before repeating these steps until both sides are flat enough for whatever project you’re working on.

Flattening Plywood with a Hair Straighter

Now, we will discuss how to flatten plywood using a hair straightener.  The following is an easy way for you to make your own flat surface on any type of material with the use of a beauty supply product that most people have in their home: A hairdryer or hair straighter.

The first thing you want to do is attach the hairdryer or straighter to a surface. You can use some type of clamp if it does not include this feature, but we recommend using one for your own safety and comfort. Next, set the temperature on high and turn on the product. Make sure you have an object being used for the process, such as a small piece of plywood or even some kind of cardboard.

Now that you have your product ready to use and all set up with a clamping system in place, what you want to do is get it close enough so the airflow will reach the front surface. Be careful not to overheat it because this can cause damage to the material. It may take a few tries before getting it right if your first time working with the heat on delicate materials like wood, but once you perfect how much distance between object and hair dryer/straightener (usually about 12 inches) then keep consistent by remembering these steps when flattening warped sheets again later on!

Flattening Plywood with Screws and Clamps

flattening plywood with clamps

This is a good option if you have no adhesives. You can use small wood screws to attach boards together with the plywood between them, then clamp across it as close to perpendicularly as possible. The whole thing will be heavy, so make sure that your surface is strong enough or else it might warp in the opposite direction of whichever way you’re trying to flatten!

Know More: What Size Screw for 3/4 Plywood and What Type of Screw do I Need?

Flattening Plywood with Pressure Cooker

If you have some form of adhesive like liquid nails, this can work well for continuing water out into the edges because they’ll expand quickly from heat while also being squeezed under pressure from all sides. It’s pretty intense but sometimes its worth it when time is short, and there are other options available such as just using a roller.

Flattening Plywood with a Roller

this might be the easiest and most cost-effective way to flatten plywood, but it may not work as well on any smaller pieces of wood. If you have an appropriately sized surface, then using a rolling pin or similar object can help push out water content inwards, which will allow for more even spreading and less warping areas overall. You’ll need enough time so that no one place is being hit too hard against the other at once because going back over things again just makes them worse!

Doing anything with glue or adhesive isn’t safe if there are children around who could spill something onto your project while it’s drying and create another layer of difficulty trying to get rid of how warped it becomes.

Flatten Plywood with an Orbital Sander

flattening plywood with sander

Flatten plywood with orbital sander? I bet you thought that was a crazy idea. It’s actually the best way to sand an uneven surface, and it doesn’t require any fancy equipment or years of experience in woodworking. If you’re interested in learning how to flatten plywood with an orbital sander, read on!

Find a flat surface you can use as your workbench. You could also put two sawhorses together and cover them in cardboard or carpet scraps, but that’s not ideal for woodworking projects because the height won’t be even. Make sure there are no nails sticking out of it; if there is, remove them so they don’t tear through your sandpaper. Clamp down whatever piece of plywood you’re working on top of this bench using C-clamps at each corner.

If it doesn’t fit perfectly underneath your sander, angle one end up by attaching a couple pieces of scrap wood under it (see Figure A). Turn on the sander and let the spinning disc touch the plywood. Move it in a small, circular pattern until all parts of your board are touching have touched both discs (see Figure B). To make sure you didn’t miss any spots, pick up the sander and slowly lift it off your workbench while watching for high or low spots to reveal themselves. Repeat steps three through five until there’s no longer a difference between where one disc ends and another begins. Your wood should now be perfectly smooth and flatten.


A straight plywood is easy to cut with a proper plywood cutting tool. You can cut plywood in a perfect shape and use them in your project. That’s why it is important to flatten them. hope this article was helpful to you.

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