In the U.S., R-Value is used to describe insulation and it simply means the measurement of thermal resistance.
Thermal resistance is a measurement of temperature difference by which a material, in this case, spray foam insulation resists heat flow.
Insulation with a higher R-Value provides a more effective barrier to heat loss. Insulation with a higher R-Value leads to greater energy efficiency and cost savings, as long as the insulation is properly installed.
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