Why specify NRG Block (the world's best block)? Because NRG Block has proven effective R-values of R-50 plus in climate zones 5 and 6. (see below for case studies)
Architects and engineers, you know the value of truly continuous insulation. Please educate the owner as necessary. Owners lose, and the environment loses, when inferior products are substituted "as equals".
Protect the NRG spec with the words "continuously insulated concrete block with zero thermal bridges". Thank you!