Q: For pre-insulated Concrete Masonry systems, what is the difference between code based R-values & effective R-values?
-Misleading Effective R Values
A: Dear MERV, For concrete masonry, effective R-values typically mean that the R-value is adjusted to account for the thermal mass of a CMU wall system. It can also take into account other variables, such as thermal lag or annual averages. Code based R-values are calculated based on either test data or...Read More