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Spray foam insulation is recognized for its exceptionally high R-value, which indicates its effectiveness in resisting heat flow. R-value is a measure of thermal resistance; therefore, the higher the R-value, the better the insulating properties. Spray foam insulation can achieve R-values as high as 6 to 7 per inch, making it one of the most efficient insulation types available on the market.

The composition of spray foam, which is a combination of isocyanate and polyol resin that expands upon application, allows it to create an airtight seal. This property not only enhances its insulation capabilities but also reduces air leaks, resulting in improved energy efficiency for homes. Its ability to fill gaps and cracks contributes further to its overall effectiveness compared to other materials.

In contrast, while fiberglass insulation has a lower R-value per inch and performs well in various applications, it typically ranges around 2.9 to 4.3 per inch. Cellulose insulation is environmentally friendly and offers decent R-values but does not match the superior performance of spray foam in terms of sealing and thermal resistance. Mineral wool insulation does provide good fire resistance and soundproofing qualities, but its R-value is also lower than that of spray foam.

Spray foam insulation stands out in terms of