The Best Type of Spray Foam Guns for Your Projects

Did you know that research has found that using spray foam insulation helps to reduce energy usage by up to 70%?

Polyurethane foam gums are also commonly mentioned as spray foam guns. Whether you've been contracted to do a home renovation project or you're partaking in a DIY renovation, I'm just getting the best type of spray foam guns to use for your project is essential.

That's why today, we've created a complete guide to help you understand the different types of spray foam guns and which one will be the best for your unique project. Keep reading to learn more!

What Is Spray Foam?

Spray foam develops when there's a chemical reaction between polyol resin and isocyanate. By mixing these two chemicals together, able to expand up to 60 times its original size. Due to the expanding properties of spray foam, it's a great tool to use if you're interested in filling every nook and cranny in an area to prevent air loss when you're insulating a room.

You can choose between two different types of spray foam, which are referred to as closed-cell spray foam and open-cell spray foam. Open-cell spray foam is often used for absorbing sound, on top of its insulating properties. However, closed-cell spray foam work sufficiently at insulating a room to protect against heat loss due to its higher density.

What Are the Different Types of Spray Foam Guns?

There are three main types of spray foam guns that you can choose from on the market, which are mechanical purge guns, air purge guns, and solvent purge guns.

The mechanism that each of these guns uses is similar, which is keeping the foam chemicals separate from each other until you've activated the spring mechanism. As the two chemicals in spray foam mix, they create the insulation that'll keep your home warm. However, the difference between these three different types of spray foam guns is how the gun pushes the foam out. 

For a spray foam gun to be continually useful, it has to purge the system after it's finished spraying. Otherwise, any remaining materials inside of a spraying mechanism will harden and render the gun useless.

1) Mechanical Purge Spray Foam Guns

This type of spray foam gun uses a valving rod to prevent the two chemicals used for spray foam for mixing until you ready to spray. By pulling the trigger that's located on the back of the rod, you'll begin the process of mixing the chemicals together. After you release the trigger, the rod will return back to its original position, which will cause a flush of any remaining chemicals.


You may find a mechanical purge spray foam gun to be useful if you're somebody who needs a variety of different flow rates for several jobs across your project. However, the biggest downside to using a mechanical purge spray foam gun is that it requires more maintenance due to the several intricate moving parts that are required to operate a mechanical purge spray foam gun. 

To ensure that this type of spray foam gun is continually useful, you'll have to ensure that the valving rod stays clean. Mechanical spray foam guns are best selected by professionals who have experience working with spray foam guns.

2) Air Purge Spray Foam Gun

The air purge spray foam gun is the most straightforward spray foam gun on the market. By activating the trigger on the foam gun, you will cause movement in the chambers that are holding chemicals. By pressing the release for the trigger, you'll cause a short blast of air that'll push any chemicals that are remaining in the chamber out of the gun.


Due to their simplicity, air purge spray foam guns are very popular. Thanks to their unique design, air purge spray foam guns don't require high maintenance. Plus, they're easy to use and sheep to maintain and comparison to the other two types of spray foam gun designs.

If you're somebody who's working on a DIY home renovation project or you know you're going to need a spray foam gun that'll be able to cover large areas easily, and air purge spray foam gun may be the best option for you.

3) Solvent Purge Spray Foam Guns

Solvent purge spray foam guns are more superior than the air purge gun. However, with a more complex design, there are some drawbacks that may dissuade you from using this type of spray foam gun.


By using a chemical solvent to prevent the chemicals are mixing together, this type of spray foam gun depends on a chemical solvent to flush out any materials that are left in the gun chamber. This type of spray foam gun is commonly used for coating, rather than insulation.

These type of spray foam guns are commonly used by professionals that have to complete a coding job. They're also more expensive than the other two options, as you have to purchase a solvent in addition to the chemicals that are needed to create spray foam.

Plus, you have to ensure that the spray foam gun is diligently cleaned. Otherwise, you'll have to worry about irregular chemical mixing and inconsistent spraying.

Understanding the Best Spray Foam Gun for Your Needs

It can be overwhelming trying to decide the best spray foam gun for your unique project, especially with the many different types of spray foam guns on the market. We hope that this guide has helped you to understand better what spray foam gun would be the best option for your needs!

Are you looking around for the highest quality spray foam guns on the market? Check out our current inventory.

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