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The Difference between Foam Spray Insulation and Fibreglass

Quality matters. The taste of the cake heavily relies on the grade of its ingredients. This assertion is also true with construction. It is wise to know the benefits and downside of the material before purchasing the said item. 

With that said, let us tackle one of the biggest concerns of new homeowners: Which is better, foam spray insulation or fibreglass insulation? 

You can make an informed decision if you have all the facts at your disposal. So, let’s get to it.


Fibreglass does the job of insulation, and its thermal and acoustic resistance is considered reliable in many insulation applications. It’s recommended for new construction and renovation projects, especially for those under a strict budget.

On the other hand, spray foam is a liquid chemical sprayed from a can. It provides an airtight and watertight seal on surfaces. Spray foam is also typically used in hard-to-reach areas and spaces with irregular surfaces.

The R-Values

The R-Value refers to how efficiently an insulator slows down heat transfer. The higher the R-Value, the more efficient it stops heat flow. 

Foam spray insulation has an R-value of 3.8-7 per inch. Meanwhile, fibreglass insulation has an R-value of only 2.2 to 3.8 per inch.

Although foam spray insulation has a higher R-Value compared to its fibreglass counterpart, thermal insulation of fibreglass-insulated surfaces can be improved using higher-quality and thicker blankets.


The higher R-Value comes with a price. Considering spray foam’s efficiency in keeping the warmth inside your home, it is understandable that it is more expensive than fibreglass. Most regular construction and renovation projects make use of fibreglass mainly due to its lower cost.


Spray foam installation is considered a long-term insulation solution. It can last as long as 50 years, or even longer. Fibreglass also provides long-term insulation under the right conditions. 


The question now is: can you install insulation yourself? Although it can be tricky, you can install either foam spray or fibreglass. However, your best bet is to let the professionals do it to avoid any inconvenience arising from incorrect installation.

The important thing is to get it installed by the right professionals. They have the right skills to finish the project on time and cost-effectively. You can go with the best foam spray insulation company in your area or with a contractor that has a reputation for providing excellent services.   


Foam spray insulation is considered the best insulation material today. It can help slow down the flow of heat and other gases inside a home, allowing you to have a comfortable and energy-efficient home. While it is a little pricier than fibreglass, think of it as an investment for your property. It can last as long as your home, and even longer!

Now that you know the benefits of foam spray insulation, you should immediately seek out PolarTech Spray Foam. We can efficiently install this material to ensure that you get the best out of foam spray insulation. So call us now for a quote!

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