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Foam vs Fiberglass vs Cellulose: Which Insulation is Best for My Existing House?

You know your home is in need of insulation, but now comes the tough decision – do you use spray foam or injection foam, fiberglass, or cellulose?

So, why is insulation so important for your home? Home insulation is what keeps the air you're paying to heat and cool inside where you want it and Mother Nature outside. This also helps to keep your air conditioner and furnace from working overtime to keep up, as long as the insulation isn't allowing for air leaks and has been routinely maintained. Another thing you want your insulation to do is to seal your home's building envelope. The building envelope is what separates your living space from the great outdoors. Not all insulation material create the air seal needed to seal the building envelope, which just adds one more piece of research for you as you choose the right insulation for your home.

Choosing the right insulation can be a daunting task while you take into consideration the cost of the material, how effective an insulation material will it be, and will it end up saving you money in the long-run.

Let’s take a look at the best types of home insulation and what that looks like for each area of the house.


Best Insulation Material: Cellulose vs Fiberglass vs Foam Insulation House Insulation Comparison


The comfort of your home is an important factor when it comes to insulation. Looking at the chart you can see that spray foam has a higher rating, as it creates an air seal that isn't possible with fiberglass and cellulose. That air seal also lends itself to the energy savings you will see in your home, because your furnace and air conditioner won't have to work overtime to maintain a constant temperature.

In your insulation research I'm sure you've read a ton about R-Value, and now you're wondering which insulation offers the highest R-value. For the purpose of this chart the spray foam range is for both open and closed cell spray foam. It's also important to note that these values are per inch of each product.

So, does a higher insulation R-Value mean it's the best option for your home? No, because it boils down to the R-value versus creating an air seal. You might hit the R-Value you want, but if it doesn't create that air seal then you still have air movement which effects the comfort and energy efficiency of your home.

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