Polyurethane Foam Guns: A Buyer’s Guide

The investment in a polyurethane foam gun, also known as a spray foam gun, can provide businesses with an effective, easy-to-use method for spraying foam for roofing applications, insulation, and other tasks. Polyurethane foam insulation provides insulating benefits to property by creating a superior air barrier. Yet, applying this material takes the right equipment.

The investment in polyurethane foam guns is effective in various situations. Polyurethane foam guns are easy to control. They have a lower learning curve for employees. And, they can be easy to maintain, depending on the model selected.

How the Polyurethane Foam Gun Works

Several applications are available. However, the spray foam gun’s job is to dispense the spray foam insulation and easily across the surface. To do this, it extracts or pulls material from the proportioning machine. The materials mix within the spray foam gun right before the application process. With the pull of a trigger, the contractor easily applies the material in a sweeping motion to the surface.

The Application of Spray Foam Insulation Offers Simple, but Effective Protection

Spray foam insulation is a highly desirable product. Available as open-cell and closed-cell, these products apply a high-density spray insulation without the complications of traditional materials. Designed for application in areas like attics and basement walls, open-cell spray foam insulation is a common product for interior use. Closed-cell foam offers a higher R-value per inch but is more rigid in its application.

With both open-cell and closed-cell spray foam options available for residential and commercial projects, contractors will need to use the proper gun for the task at hand. The spray foam insulation itself comes in large drums. It includes a resin and an Iso. The two liquid-based materials remain isolated until the spray gun trigger is pulled. This is necessary.

When the trigger of the polyurethane foam gun is pulled, the two liquid materials travel through the heated hose towards the nozzle. They combine within the gun and, with the trigger placed, the foam shoots out of the spray foam gun onto the surface. The material rapidly fills the cavity present, and within minutes fills the space.

Selecting the Appropriate Polyurethane Foam Gun

As a component to your spray foam machine or rig, the polyurethane foam gun you select plays a role in how effective the material is dispersed as well as how easy the task is for the worker. Spray foam guns are a key component of the job any professional performs.

A key consideration in purchasing polyurethane foam guns is to invest in easy maintenance. If any of the material is left behind within the interior of the gun, it will harden quickly. This creates a very difficult-to-remove substance within the gun. This is a common cause of repairs or replacement. Some manufacturers, such as GRACO, offer a gun designed to cleanse the interior quickly and efficiently.

The Type of Spray Foam Guns Available

Polyurethane foam guns are available in several designs. Each one operates slightly differently but provides the same basic application process.

  • Mechanical Purge Guns: This is perhaps the simplest of the options, but a common one. In this design, a valving rod sits within the mixing chamber. When the user pulls or pushes the trigger, the rod moves, allowing the chemicals to mix and then be extracted. The rod moves back into place when the trigger is released.
  • Air Purge Guns: This style works using high pressured air. When the user presses the trigger, the mixing chamber moves and allows the materials to mix. Once the user releases the trigger, a force of air occurs. This allows the materials within the chamber to be forced out, minimizing the risk of build up within the device.
  • Solvent Purge Guns: In this case, the contractor uses a solvent to prevent the chemical reaction from occurring. The solvent works to remove any material within the spray foam gun. This specific type is best for two-part urethane coating and polyurea coatings.

Key Features to Look for in a Polyurethane Foam Gun

Aside from the design of the polyurethane foam guns and the type of spray foam insulation applied, there are a few other key considerations when selecting these guns.

  • Accurate application. Some products, such as the GRACO Fusion line of spray foam guns, work well to create an accurate spray application. This creates less downtime and minimizes the need for repairs.
  • Cleaning methods matter. As noted, a reliable cleaning method is essential. Those spray foam guns using air blast technology tend to be the easiest to maintain long-term because the gun ensures all material is extracted when the trigger releases.
  • Simplistic mixing. Some of the spray guns have a fluid housing quick release design to them. This is ideal as it ensures the material can mix easily without any additional tools required. It helps automate this process.

With numerous makes and brands available, finding the right polyurethane foam gun can take some comparison shopping. For those who require assistance, allow our team at Intech to provide you with guidance.