The argument goes like this. You need a certain depth of insulation to achieve your R value by code. They visually inspect and determine that you are not at the required depth. That makes sense so far.
Then they recommend that you reinforce your existing insulation
A. Don’t base your purchasing decisions on what Industry is saying you consume. This may have been the way 5 years ago but now you have the technology to make accurate decisions. Had I followed the industry estimates I might have mistakenly purchased a new refrigerator.
B. Let the data drive your purchasing decisions. Following the data allowed me to save an estimated $700/ year even though I recently made a purchase.
This is a great article in response to a homeowner frustrated with a specific room in his house. This problem can happen in any climate or geography. However, the author’s answer is both right and wrong.