Minimum code wall insulation is R-13, and up to R-30 in colder climates. Even the best Zip-R isn't going to hit that on its own. And if you are building a ne

Minimum code wall insulation is R-13, and up to R-30 in colder climates. Even the best Zip-R isn't going to hit that on its own. And if you are building a new custom home, you'd be crazy not to surpass code for insulation, given the operational energy savings.