June 17, 2024

Fixing Warped Plywood: Everything You Need to Know

5 min read
Learn how to fix warped plywood with our comprehensive guide.
A person fixing a warped piece of plywood using tools

A person fixing a warped piece of plywood using tools

Plywood is a versatile building material with a wide range of applications, from flooring and wall cladding to cabinetry and furniture-making. However, one of the most common issues with this material is warping. When plywood warps, it can throw off the measurements of your project and make it difficult to work with. In this article, we’ll explore the causes of plywood warping and provide you with eight effective ways to fix it.

Understanding Plywood Warping and How to Fix It

Before we dive into the solutions, it’s important to understand why plywood warps in the first place. Plywood is made up of layers of wood veneer glued together with the grain running in opposite directions. This cross-grain construction gives plywood its durability and stability. However, changes in temperature and humidity can cause the layers of plywood to expand and contract, leading to warping.

The Science Behind Plywood Warping

When plywood absorbs moisture, the layers of veneer will expand, causing the board to curve along its length. When the moisture content in the board returns to its original level, the board may not return to its original shape. This can cause the board to remain curved or warped.

Another factor that can contribute to plywood warping is improper storage. If plywood is stored in an area with high humidity or exposed to moisture, it can absorb the moisture and warp. It’s important to store plywood in a dry, well-ventilated area to prevent warping.

There are several ways to fix warped plywood, depending on the severity of the warp. One method is to apply moisture to the concave side of the board and place it in a flat position with weights on top to hold it down. This can help the board regain its original shape. Another method is to cut the board into smaller pieces and use them for smaller projects where the warp won’t be as noticeable.

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8 Effective Ways to Flatten Warped Plywood

Now that we understand the science behind plywood warping, let’s explore eight effective ways to fix it.

Using Heavyweights to Flatten Plywood

One of the easiest and most straightforward methods for flattening plywood is to use heavyweights. Place the warped plywood between two flat surfaces and add weights or heavy objects on top. Make sure to distribute the weights evenly. This will apply pressure to the board and help it to straighten out over time.

The Wet Cloth Method for Flattening Plywood

Another easy and inexpensive method for flattening plywood is the wet cloth method. Start by soaking a cloth in water and then wringing out the excess moisture. Place the damp cloth on the concave side of the warped plywood and let it sit for several hours. The moisture from the cloth will penetrate the board and help it to straighten out.

Steam Ironing: A Quick Fix for Warped Plywood

If you need to flatten a small piece of plywood quickly, steam ironing can be a great solution. Start by heating up an iron and dampening a cloth. Place the cloth over the warped area of the plywood and apply the hot iron to the cloth. The steam from the iron will penetrate the board and help it to straighten out. Be sure to keep the iron moving to avoid scorching the wood.

Vacuuming Plywood: A Simple Solution for Warping

Another straightforward method for flattening plywood is to use a vacuum cleaner. Place the warped plywood on a flat surface and apply the suction end of the vacuum cleaner to the concave side of the board. This will create a vacuum that will pull the board flat. This method works best for small to medium-sized boards.

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Straightening Plywood with a Hair Straightener

If you don’t have an iron, a hair straightener can be a great tool for flattening small pieces of plywood. Heat up the straightener and apply it to the concave side of the warped board. Move the straightener back and forth over the board until it begins to straighten out.

Clamping and Screwing: A DIY Approach to Flattening Plywood

If you have some basic DIY skills, clamping and screwing can be an effective method for fixing warped plywood. Start by placing the warped board on a flat surface and screwing it down at the corners. Then, use clamps or heavyweights to apply pressure to the board and hold it in place until it straightens out.

Pressure Cooking Plywood: An Unconventional Method for Flattening

For those who are up for an unconventional method, pressure cooking plywood can be an effective solution for flattening warped boards. Place the warped board in a pressure cooker with a small amount of water and cook it under pressure for several hours. This will cause the moisture inside the board to expand, helping to straighten it out.

Smoothing Out Warped Plywood with an Orbital Sander

If you’re still left with some small bends or warps in your plywood, an orbital sander can help smooth things out. Start by sanding the concave side of the board, taking care to remove only enough material to make it flat. Then, sand the convex side of the board until it’s smooth and even.

Using Heat to Flatten Plywood

Heat can also be used to flatten plywood. Start by placing the warped plywood in a hot, dry area, such as a sunny spot outdoors or near a heater indoors. The heat will cause the moisture in the board to evaporate, which can help it to straighten out. Be sure to monitor the board closely to avoid overheating or scorching the wood.

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Using Moisture to Flatten Plywood

Moisture can also be used to flatten plywood. Start by placing the warped plywood in a damp area, such as a humid bathroom or near a humidifier. The moisture in the air will penetrate the board and help it to straighten out. Be sure to monitor the board closely to avoid over-saturating the wood, which can cause it to warp even more.


While warped plywood can be frustrating, it’s a common issue that can be easily fixed with a little know-how and the right tools. Whether you use heavyweights, the wet cloth method, an iron, a vacuum cleaner, a hair straightener, clamps and screws, pressure cooking, or an orbital sander, you can straighten out your warped plywood and get back to your project with confidence.

It’s important to note that prevention is key when it comes to warped plywood. Storing your plywood flat and in a dry environment can help prevent warping from occurring in the first place. Additionally, using high-quality plywood and avoiding exposing it to extreme temperatures can also help prevent warping. By taking these preventative measures, you can save yourself the hassle of having to fix warped plywood in the future.

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