The Best Spray Foam Insulation Kits: 2021 Buyers Guide

| Last Updated: July 28, 2021

Are your heating bills through the roof? Are you struggling to keep your house cool in the summer? This might be due to insufficient insulation.

When we don’t insulate our homes properly, we find that drafts can get into the house in the winter, and air-conditioned air escapes in the summer. To prevent this, using spray foam around the home will create a more energy efficient haven. This will cut down your energy bills while putting you one step closer to being an eco-warrior!

If you’re wondering what kind of spray foam insulation you need or how to choose between the available products, check out our guide below.

Comparison of the Best Spray Foam Insulation Kits

IMAGEPRODUCT
  • Spray foam sealant kit that fills cracks, cavities, and expansion joints
  • High-quality product for air sealing and insulating
  • Comes with an INSTA-FLO Gun Dispenser and a 30 foot hose
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  • Effectively fills expansion joints, cracks, and cavities for air sealing and insulation
  • Suitable for insulating stud wall cavities that are almost two inches think
  • Contains energy loss by providing insulation level of R-6.5
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What is Spray Foam?

Made from the chemical components ‘isocyanate’ and ‘polyol resin’, spray foam occurs when these two things react together. It causes the chemicals to mix together and expand by up to 60 times its original size.

Because this foam increases into such a large size very quickly, it is the ideal insulator as it can be sprayed into nooks and crannies, filling them to prevent air loss. This is why spray foam is used as an insulation device.

Man applying spray foam (Source)

There are two main forms of spray foam: open-cell and closed-cell. The first option is very good at absorbing sound and is often used in soundproofing. The second version has a much higher density, which makes it great for insulating against heat loss.

This product has actually been used on military aircraft since its invention in the 1940s. However, it wasn’t utilized as an insulating agent for heat retention until the 1970s. Since then, it has become a very popular choice for people trying to seal up their homes for more efficient heating.

Uses of Spray Foam Insulation Kits

A very versatile insulator, spray foam has a whole host of applications within the home. Firstly, people use spray foam in the attic or loft as heat rises. The rising heat is often lost through the roofs of our houses, or through our chimney stacks. By spraying foam into the cracks and around the edges of the attic, we find that the heat is kept in more securely. This can reduce heat loss between 30 and 50% in the home.

Spray foam is widely used inside walls to help keep them insulated. By spraying foam into the walls of a home, this can insulate up to 300 times as more than a wall on its own. The spray foam widens significantly to fill the gap. Either open or closed cell spray foam can be employed in this case.

Contractor performing spray foam insulation (Source)

The ceilings of garages are very rarely insulated. As garages are rather drafty, we end up losing a lot of heat through the garage. This heat rises in the garage, usually escaping through the garage ceiling. Employing spray foam up in the upper recesses of the garage ceiling and in any associated crawl spaces will help to insulate the room and in turn, the house.

When we use open-cell spray foam in our walls, attic, or in the ceiling, we also add soundproofing. For people in duplexes or adjoined housing, this can work very effectively to keep out the sounds of noisy neighbors while also keeping the house nice and warm.

Why Using Spray Foam Insulation Kits is Important

Spray foam is an excellent insulator that brings many benefits when employed in the home.

  1. Saves energy – By insulating the walls and ceilings, spray foam means less heat loss. This keeps our houses warm and negates the need for such high and frequent heating, saving both energy and money. In fact, foam insulation can cut back energy loss by 30-50%.

  2. Helps with allergies – As the foam helps to seal up cracks, it stops pollen and dust entering your home. This helps to reduce asthma attacks and other allergies.

  3. Less mold – As the air is less damp, this means the chances of mold entering the home are lower. By sealing up any gaps, spores can’t enter the home, and damp, cold air can’t settle.

  4. It is durable – Spray foam doesn’t sag or settle, so will retain its insulation over the years. In comparison to window film that often falls off, this type of insulation has a long lifespan.

  5. Prevents freeze damage – External walls freezing can cause issues to pipes inside them. Insulation of this kind helps to stop the temperature from dropping too low, helping to prevent burst pipes.

  6. It can soundproof the room -Some spray foams can work to block out sound, as well as keep in heat. This keeps your neighbors from disturbing your peace.

Reviews of the Best Spray Foam Insulation Kits

Whether you are looking to improve the heat efficiency of your home or trap cool air in the summer, insulation is the best way to go. Have a look at these spray foam insulation products to see what you might be looking for and find one that suits you.

Dow Froth Pak  620 Spray Foam Sealant Insulation Kit

FROTH-PAK 620 Sealant - 2 Component Foam Insulation Kit - A Tank, B Tank, 15' Hose - Closed Cell, Quick Cure, Polyurethane, Expanding Spray Foam

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Review

This two-part kit comes with a tank for each chemical. It has a 30-foot hose, gun dispenser, and 12 nozzles, both coned and fanned. There is a lubricating jelly packet and a wrench included with this kit.

Bottom Line

While unfortunately, the tanks are not recyclable, this insulation covers a large area and works well. Designed for easy application, this model includes technology to stop nozzles from becoming blocked while in use.

Pros

Lubricating Jelly Prevents Clogging

Very Long Hose for Diverse Application and Easy Portability

Easy to follow Instructions and Good Quality Tools are Included

Nozzles are Anti-Crossover to Stop Blockages as the Chemicals Mix

Cons

Quite expensive

Tanks are Not Recyclable

Dow Froth Pak 650 Spray Foam Insulation Kit Title

Dow Froth Pak 650, Spray Foam Insulation Kit, Class A fire rated 650 sq ft

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Review

Another two-part kit, this foam insulation can be used to fill cavities as well as seal to prevent air loss. It has a great energy efficiency rating and can yield up to 650 board feet with a 1.75-inch foam density. It comes with hose, gun, and nozzles.

Bottom Line

This model is effective at sealing cracks and retaining heat, but can be a little temperamental in regards to even delivery of each chemical. This kit covers a large area and is easy to apply.

Pros

Covers a Large Area

Very Energy Efficient

Can be Used as a Sealant as well as an Insulation Product

Cons

Must Watch Nozzle Carefully to Ensure Even Amounts of Chemicals

Some Customers Complain that Chemicals Vary in Proportion, Leaving Leftovers in One Tank

Foam It Green 602 Closed Cell Spray Foam Insulation Kit

Foam It Green 602 Closed Cell Spray Foam Insulation Kit

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Review

Designed for first-time users, this product is fire retardant and seals out air while insulating. It is mold and pest resistant and comes with 17 accessories including gloves, nozzles, and goggles.

Bottom Line

Designed for first time users, this is easy to apply if you follow the directions for an easier application. It is a little drippy but comes with gloves and goggles to protect your skin and eyes.

Pros

Pest and Mold Resistant

Very Easy Application Even for First-Time Users

This Spray Foam has been Proven to Work in 50,000 Homes

Foam Comes with Varying Sized Nozzles for Easier Application.

Comes with Goggles and Gloves to Protect You from the Chemical

Cons

Difficult to Spray Evenly

Spraying too Much May Cause it to Drip

Conclusion

Insulating your home is extremely important if you want to save costs on high energy bills during the colder months. Not only does the spray foam help to keep heat in, but it also saves on air conditioning bills as cold air is retained throughout the house.

Remember to choose wisely between closed and open-cell spray foam, especially if you have soundproofing needs. Either way, adding spray foam can help to cut heat loss by half in your home. Saving considerable money on bills means more money in your pocket. 

People Also Ask

Spray foam insulation kits can be a great method to keep your indoors warm and cozy while ensuring that the bills do not hit the roof, and costs don’t break the bank. They are also energy-efficient. Some things you must know about spray foam insulation system if you are considering to purchase a kit:

What is the R Value of Spray Foam?

The R value is basically a measure of thermal resistance, and the higher it is, the better insulation it provides to your home. Spray foam insulation are of two kinds: Open and closed-cell. The R-value for an open-cell spray foam ranges from R-3.5 to R-3.6 per inch, while the R-value for a closed-cell spray foam ranges from R-6.5 to R-7 per inch. 

What is the Difference Between Open Cell and Closed Cell Spray Foam?

The space between the bubbles or cells that make up the foam determines the difference between open and closed-cell spray foam. In closed-cell spray foam, the cells are mushed together to become airtight, which makes it firmer than open-cell spray foam. 

What Type of Spray Foam Insulation Should I Use?

If you want higher insulation in your home and more warmth, you should go for spray foams that have a higher R-value than others. A closed-cell spray foam insulation kit will provide you with more warmth than open-cell spray foam.

Do You Need a Vapor Barrier With Open Cell Foam Insulation?

Yes, you will need a vapor barrier with open-cell foam insulation, depending on your location of where you reside. These vapor barriers are placed on the warmer side of the wall in order to eradicate moisture-related issues in your home. 

Do You Need to Cover Spray Foam Insulation?

Spray foam insulation should be covered with drywall inside the home for safety purposes so that in case of a fire, the covering can protect the foam insulation from catching on fire. 

How Thick Spray Foam Insulation Do I Need?

The thickness of spray foam usually depends on the area that it is being applied on. However, a ball-park figure of thickness for an open-cell spray foam should be about 6-inches on your roof deck and 3-inches on the walls. Closed-cell foam sprays should be sprayed about 2-3 inches thick on the walls. 



My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.