Spray Foam Insulation Vs Fiberglass – Which Is Really Best?

Spray Foam Insulation vs Fiberglass

Spray foam or fiberglass: which is most likely to keep your home warm during the winter months?

Decades ago, fiberglass insulation was by far the most popular option for homeowners to use. However, in recent times, spray foam insulation has been rising in popularity. People often have strong opinions of one over the other. But which is really the best option for your home? There are several factors to consider beyond simply cost. Let’s break down how each option stands up and which one truly shows itself as the winner.


In terms of upfront cost, fiberglass insulation takes the lead. This is perhaps the main factor that still makes fiberglass insulation a viable option to many homeowners. It’s considerably cheaper than spray foam insulation, often less than half the cost. However, it’s worth noting that fiberglass insulation may cost homeowners more once it’s installed, whereas spray foam insulation is more likely to save homeowners money. This comes down to…

Energy Efficiency

Here, spray foam insulation is the clear winner. Fiberglass insulation is installed in sheets within the wall, but on average about 30% of indoor air escapes through the fiberglass insulation, making your home drafty and uncomfortable. It can also cause your heating bill to shoot up as your HVAC system has to work twice as hard to keep your home warm. Spray foam insulation fills to fit the space it’s meant to insulate securely, and closed cell spray foam especially works to seal your home and prevent heat loss on the coldest days. This lowers your energy bills as well, saving you money.


Fiberglass insulation is not built to last. It may serve your home for 10 years or even 20, but eventually, you will have to have it replaced. It’s also highly flammable due to the batting, which could even put your house at risk. Spray foam insulation can last for upwards of 80 years, and though it’s not impervious to fire, it often comes with a fire retardant to protect your home. Thus although you may be investing more money upfront, you’re sure to make up that cost by not having to replace your insulation in years to come.


Again, the fact is that fiberglass insulation allows for too much heat loss and air leakage to make your home very comfortable. Spray foam insulation, custom fitted to your walls and the space it’s meant to insulate, is the best option for keeping that to a minimum. It also does a far superior job to fiberglass insulation of adding a sound barrier, so you’re not kept up by the sounds of whatever might be going on outside.

With all the factors considered, spray foam insulation is a no-brainer. Need spray foam insulation for your home? Contact Jancewicz & Son today for more information or a free estimate.

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