Spray Foam vs. Rockwool Insulation: Thermal Performance & Cost Comparison

Mar 3, 2025

Is spray foam insulation better? Or is rockwool insulation better? The answer depends on your insulation requirements. Check out USA Spray Me’s guide to see which material fits your needs more!

You may have been putting off upgrading your insulation because the number of options out there is downright dizzying. However, in your search for the right material, you may have noticed spray foam and rockwool standing out as popular choices. But which one should you go for? USA Spray Me answers your questions in their comparison guide.

Continue reading or visit https://usasprayme.com/blog/spray-foam-insulation-vs-rockwool-cost-rvalues-compared.html to learn more!

R-Value

First, let’s take a look at one of the most important factors of insulation: the R-value. The efficiency of any insulation is measured by its R-value, which is the material’s ability to resist heat flow. According to USA Spray Me’s guide, a higher R-value indicates more thermal resistance, meaning better insulating performance overall, which in turn leads to lower energy consumption.

Spray Foam

With an R-value of 6 to 7 per inch, spray foam insulation is among the highest-performing insulating materials, making it the recommended option for property owners who want to prioritize energy efficiency. 

The material is composed of a liquid chemical mixture that expands to fill gaps, creating a continuous barrier that reduces air leakage and protects the interior of the home from moisture; this also means it can be easily installed in hard-to-reach areas and will conform to the surrounding architectural features. 

Spray foam is available in both open-cell and closed-cell types, which are suitable for different insulation needs. It’s pretty much the all-star of insulation materials.

Rockwool

Rockwool is another popular insulation material that sports a dense structure that is conducive to reducing heat transfer and regulating indoor temperatures. Because of its more modest R-value of 3 to 4 per inch, it is most effective in moderate climates with less extreme temperature fluctuations. 

Additionally, rockwool is made from volcanic rock and steel slag, offering natural fire resistance and noise reduction for buildings; this composition also improves the material’s durability, and it will maintain its shape and density without settling over time. 

Cost Comparisons

While spray foam is generally the more effective insulating material, USA Spray Me’s guide says that it has higher upfront costs, which are further compounded by the need for professional installation services. Spray foam is pretty tricky to work with and may not cure evenly if it’s not applied properly, so it’s better to just leave it to the experts from the get-go. 

That said, you can always see it as a long-term investment. That’s because spray foam will give you higher energy savings over time, and its lower maintenance requirements will also help a lot with costs. 

So, are you interested in upgrading your insulation? You can contact USA Spray Me for a free building inspection and a quote. Once they figure out what the best option is, they’ll tell you exactly what needs to be done. You can trust the work of the experts who have been at it for over 10 years!

Visit https://usasprayme.com/ to get started!

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