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August 17, 2021
Eric Emin Wood

Best Spray Foam Guns for Insulation

Did you know that investing in the best spray foam insulation gun can provide your business with an easy-to-use and effective method for spraying foam for various roofing applications and other tasks? However, note that with different types of spray foam insulation guns varying in quality and features, choosing the best spray foam gun for your business can be tricky and difficult.

Choosing the most suitable spray foam insulation applicator gun for your construction or other projects may make all the difference between a job well done and an unhappy client. If you are looking for the best pro foam spray gun, we have you covered.

What is Spray Foam?

Spray foam is effective chemical-based insulation created by combining polyol resin and isocyanate into a foam. Note that spray foam is usually mixed on-site by insulation contractors and then applied with a spray foam insulation gun or sprayer.

It is worth noting that spray foam is available in either open cell or closed cell varieties. Also, polyurethane is the most commonly used material in spray foam. High-density spray foam is for exterior and roofing applications. On the other hand, low-density spray foam is best for unvented attic applications and interior wall cavity fill applications.

How Does Spray Foam Work?

Professionals spray foam out of a hose in order to cover the area that needs insulation. Note that the two chemicals mentioned above are carefully mixed in the spraying process. As you apply the spray foam, it will expand and harden into place, filling in even the smallest cracks, crevices, and gaps.

The spray foam hardens quickly and creates a strong air barrier. There is no doubt that one of the best things about spray foam products on the market (whether it is new construction, a retrofit, or a renovation) is their capacity to create a continuous barrier. It will cover everything and all types of even and uneven surfaces. Also, spray foam is a durable, lightweight, and versatile insulation solution.

Why Use Spray Foam Insulation?

If you compare spray foam insulation with many other kinds of insulation, you will realize that spray foam insulation does a much better job of minimizing air infiltration. Spray foam insulation also helps limit moisture from both entering and escaping a home, in turn reducing the load on cooling and heating systems.

One of the most notable benefits of spray foam insulation is that it provides excellent thermal performance as well as the highest R-value per inch for more potential energy savings.

Because of the increasing cost of energy and more focus on environmental and health issues, builders and architects are now recommending insulation materials that can add notable performance value to various types of construction and remodelling projects. Spray foam is certainly at the top of the recommended product list.

Advantages of Spray Foam in Construction Projects

Did you know that general contractors, builders, insulators, and other professionals in the construction industry recognize the effectiveness and efficiency of spray foam insulation? Keep in mind that spray foam works as the right application for many reasons.

An excellent benefit of spray foam insulation is its flexibility to install it almost anywhere. This is why it has become the go-to product for basements, attics, and exterior walls.

Also, spray foam application is a reliable and cost-effective means of getting your construction job done right the very first time. It also helps contractors and builders meet or even exceed state and local code regulations. 

Keep in mind that spray foam is composed of an inert polymer that does not provide a source of food for mould and bacteria. This is why homes insulated with spray foam are much better protected against mildew and mould.

Open Cell and Closed Cell Spray Foam Insulation

Did you know that there are two main types of spray foam that professionals use in home building and construction projects? These are called open cell and closed cell spray foam insulation.

You can use each for various projects and purposes, such as foam roofing material and creating unique decorative interior moulding that’s either painted or stained for an elegant and timeless simulated wood effect. However, note that usually, the most common use is to insulate walls.

Closed Cell Spray Foam Insulation

You should know that closed cell spray foam is also known as medium density foam or “2.0 lb.” foam? Note that the tiny foam cells are closed and strongly packed together in closed cell spray foam. They are also filled with gas to help the foam rise and easily expand.

This is why it becomes an excellent insulator. It’s much denser compared to open cell spray foam and stops moisture and air completely.

You will be glad to know that closed cell foam insulation is now among the most efficient and effective insulating materials available commercially? It has aged R-Values above 6 per inch.

Closed cell spray foam is popular in various applications, such as attics and knee walls, exterior walls, crawlspaces, ceilings, and roofs.

Open Cell Spray Foam Insulation

On the other hand, open cell spray foam has a lower density. It is made with polyurethane. Did you know that open cell spray foam may also contain some raw materials, such as soybean oil?

As open cell spray foam is low-density foam, if you cut one piece of this foam into one cubic foot, this piece of foam would usually weigh about half of one pound.

Open cell foam has a lower R-value compared to closed cell spray foam, used to measure the amount of heat resistance. This simply means that open cell spray foam is usually more vulnerable to insulation failure if temperatures fluctuate. You can apply it to walls, roofs, and ceilings.

Best Low Maintenance Spray Foam Insulation Gun

The Fusion ProConnect Gun without Mix Chamber 25P591 features a convenient and all-in-one cartridge head. This head replaces several individual parts in the fluid section with just a single component. The gun has a weight of 2.95 lbs, and its width is 3.3 inches, height is 8.1 inches, and length is 8 inches. You can use this budget spray gun for various applications, such as wall and roof insulation and roof coating.


  • Features integrated check valves for better cross-over containment
  • 13 parts replace a single ProConnect cartridge
  • You don’t have to buy fluid section o-rings

Best Mechanical Purge Spray Foam Gun

As the name suggests, a mechanical purge spray foam gun, such as Standard Round Spray Fusion Mechanical-Purge Spray Gun 247211, uses a mechanism that prevents chemical mixing until you are ready. You can spray open cell or closed cell spray foam insulation or polyurea coatings with the Fusion MP Gun as it can handle everything. It is a manual gun with a flat spray pattern.

The spray gun's width is 15 inches, height is 6 inches, and depth is 17 inches. You can use this gun for various applications, such as roof coatings, wall and roof insulation, and pipe and tank coating. When you pull the trigger, the rod will move, allowing all the chemicals to mix and be extracted. Its rugged and sturdy design provides an amazing mix and material properties. This gives you great results at your job site.

A Fusion MP Gun is useful if you require several different flow rates across various jobs. It provides you with the best mixing as well as final material across all spray guns. The results are reliable and professional.


  • Handles everything from the low output and thin mil applications to large and high flow output applications
  • Simple mechanical cleaning
  • Better atomization and smoother finish
  • PolyCarballoy mix modules effectively for proven long life

Best Air-Purge Gun

The mechanism of the Flat Spray Fusion Air-Purge Spray Gun is simple. When you press the trigger, it moves the chemical chambers, leading to foam production. And when you release its trigger, the spray gun will produce a short air blast. The blast pushes out all remaining chemicals from the gun chamber.

The gun has a fluid orifice size of 0.038, and its weight is 2.5 lb.The spray gun's width is 3.3 inches, height is 8.1 inches, and length is 7.5 inches. You can use this gun for various applications, such as roof coatings and wall insulation.


  • The design and long-lasting seals lower the need for regular maintenance
  • It provides a great chemical mix
  • The mixing chamber of the gun has a long life
  • Ergonomic handle

Best Liquid-Purge Gun

With its amazing and revolutionary technology, the Fusion CS RD0202 can help eliminate the drilling of the mix chamber. This is great as it increases your spraying uptime while reducing considerable downtime spent on repair and maintenance.

Your polyurea, as well as spray foam jobs, will not be the same as soon as you deploy the Fusion CS 02RD liquid purge gun. It is a manual gun with a round spray pattern.

You can use it in various applications. Some are bridge protective coating, air sealing attics, and roof and wall insulation. The gun weighs 2.6 lb, and its width is 3.3 inches, height is 8.1 inches, and length of 7.5 inches.


  • Gain more flexibility and maneuverability so you can spray in small, cramped, and tight areas
  • Multiple settings
  • Features a non-stick polymer cover to keep the gun head neat and clean
  • Reduces foam blowback

Best Roofing Application Gun

The Gusmer GX-7A Spray Gun - 1/90 295542 plural component gun is recommended for spraying foam. It is a mechanically self-cleaning and reliable spray gun and eliminates costly solvent flushing. The GX-7 spray gun is also the industry's preferred roofing spray application gun for applying two-component foam systems.

In addition to roofing applications, it is also used in tank and pipe coatings foam insulation. The gun has a weight of 4.1 lbs with a width of 4.5 inches, 9.5-inches height, and a length of 9 inches.


  • Easy to operate and lightweight
  • Designed to handle the most challenging and toughest job-site conditions
  • Pattern control knob is great as it allows for fine-tune adjustments

Best Pro Spray Foam Insulation Gun

Probler P2 simplifies and improves your efforts when it comes to foam insulation. Probler P2 Elite Gun Assembly with 03 Mix Chamber Kit GCP3R3 has a double piston design that provides you with over 300 pounds of triggering force. The pro spray foam gun has a weight of 3.9 lbs. Its width is 6.875 inches, height is 4.75 inches, and length is 3.125 inches. You can use this budget spray gun for various applications, such as wall and roof insulation and roof coating.


  • Easy to maintain
  • Simple-to-replace mix chamber insert
  • Balanced design and ergonomic handle
  • Responsive and reliable trigger action

FAQ Section

Is Spray Foam Insulation Safe and Eco-Friendly?

You will be pleased to know that there are many safe and eco-friendly spray foam products on the market. These eco-friendly and safe spray foam products don’t contain any toxic chemicals, formaldehyde chemicals, or harmful gases.

Will Spray Foam Insulation Save Costs?

On application, spray foam expands in order to insulate and fill cracks, crevices, and gaps, providing a consistent and lasting air seal. The US Department of Energy revealed that by using spray foam for minimizing air leaks in roofs and walls, a regular homeowner might save up to 15% on cooling and heating costs. Did you know that if all the 113 million single-family homes in the US used spray foam for insulation, American homeowners could save as much as $33 billion per year in energy costs?

How Long Does it Last?

As it is made from an inert polymer, note that spray foam insulation can last a very long time, such as 70 to 80 years. Did you know that even roofing applications tend to last at least 30 years, with adequate long-term maintenance?

Which Spray Foam Gun Is the Best for Roofing Coating?

You may know that roofing applications usually demand a reliable set of spray foam guns. Note that depending on the specific materials you need as well as the nature of your project, you might also need airless sprayers to apply an elastomeric or acrylic coating. One of the best guns for roof coating is Graco GX-7, as it is adept at handling both spray foam and polyurea applications./catalogue/spray-foam/spray-foam-insulation-equipment/

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