Foam vs. Fiberglass

There are pros and cons to both fiberglass and spray foam insulation - discover them here.

At Lucas Insulation, we’re proud to offer the highest-quality insulation for your home, as well as the proper techniques that maximize their effectiveness and the knowledge to help you pick the right product to meet your insulation needs. For non-insulation experts, however, the differences between fiberglass and spray foam can be hard to parse out.

That’s why we’ve assembled this chart, to show you the various pros and cons of each type of insulation we offer:


Spray Foam

Made up of billions of tiny glass fibers

Made up of a polymer (like polyurethane) and a foaming agent

Uses air bubbles to slow the transfer of heat

Acts as a barrier to stop airflow

Air leakage common (which can account for as much as 40% of AC costs)

No air leakage (when installed properly by experts)

Lower R-factor, so you need much thicker insulation

Higher R-factor, so less insulation required

Has the potential for mold growth and pest infestation

Kills mold and prevents future growth

Can sag and settle over time, requiring multiple installations

Will not sag or settle

Easy to update, re-install, or replace

Much more difficult to update, re-install, or replace

Less energy efficient

More energy efficient


Cheaper per square foot

2-3x more expensive per square foot

Higher utility costs long term

Bigger savings on heating and cooling costs

While this chart is a good start to determining which insulation type would be best for you, there’s no right answer when it comes to insulation. The best option for insulating your home depends on so many factors – the layout of the house, its sealing, your budget – that there can be no one-size-fits all solution.

That’s why we recommend that you take advantage of our free in-home analysis, so you can find out what kind of insulation would work best for your home. Call or contact us today to speak with one of our insulation experts and schedule your free analysis at 803-951-2378.

I did indeed hire Mr. Lucas. I have 5 attic spaces in my house, I asked him to do just one, about 650 square feet. The dramatic difference in temperature in that room and the cooling efficiency below that room was really incredible. I have kept daily temperatures on all the rooms and the difference is remarkable. He is going to do the rest of my house, around another 4,000 square feet in about 10 days. The savings in energy and the comfort level far outweigh the costs. The insulation is not cheap but, it's much better than paying high energy bills. I am referring him to my family and he will help insulate some of our properties.

Jimmy W., Columbia, SC