I realize all municipalities are different but- anyone run into code issues on insulation on reno work? Being told by 1 of 3 vendors pricing the job that if a building is taken down to the studs, the insulation needs to be brought up to code on the entire structure. Not unreasonable however the only way to get old 2x4 exterior stud walls up to R21 it would require closed cell application in them. I checked chapter 26 in 2015 IBC and didnt see where this was ref'd so could be a local thing (update NY). Anyone run into this before? I will likely need to follow up with the code office.