Sadly code minimums for newer builds haven’t really changed drastically in decades. It’s all just 2x6 with batt and poly, fundamentals the same as it has been since the 1970s. My 2019 build just had the shower lines freeze because they’re against an exterior wall (-30 cold snap, but still).
You’re probably right though that a heat pump is a better investment. Redoing the entire building envelope is a big ask if it’s not deteriorating and needing work anyway.
Sadly code minimums for newer builds haven’t really changed drastically in decades. It’s all just 2x6 with batt and poly, fundamentals the same as it has been since the 1970s. My 2019 build just had the shower lines freeze because they’re against an exterior wall (-30 cold snap, but still).
You’re probably right though that a heat pump is a better investment. Redoing the entire building envelope is a big ask if it’s not deteriorating and needing work anyway.