When one comes across the R 13 + 7.5 ci wall insulation requirement in the International Energy Conservation Code (IECC) commercial provisions, it can be tempting to just add the two R-values and install R-20.5 rated insulation in the cavity with the assumption being that the same performance can be achieved with fewer steps.
When the National Football League (NFL) announced its 52nd championship game would take place in Minneapolis, Minnesota, professionals in hospitality, commercial real estate, and construction industries in the Twin Cities scrambled to capitalize on the future economic infusion from the big game, slated for February 4.
Many conflate R-value with good thermal performance or insulating value. The belief is the higher the R-value, the better the thermal performance. However, as a blanket statement, this could not be any further from the truth.