What Is The Highest R Value?
What Is The Highest R Value? Our proprietary USA Premium Foam Insulation has a superior R-Value of 5.1 per inch, which is 35% higher than any retrofit stud wall application. In fact, it’s the highest on the market. What is a good R-value? Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38