[danans]

Zip system sheathing, while great, is not enough. You still need either cavity wall insulation or exterior insulation or both.

For cavity wall insulation, dense packed cellulose is a carbon negative option currently widely available.

[theluketaylor]

Zip-R sheathing is exterior insulation, from R-3 up to R-12

https://www.huberwood.com/zip-system/insulated-r-sheathing

[danans]

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.

[bradknowles]

If you want to build to PassivHaus standards, you're going to need a lot more than that.

Matt Risinger has some nice videos on examples of doing that on his "Build Show" channel on YouTube.

[zionic]

Zip + metal stud + rockwool and you’re g2g

[bradknowles]

You're going to need thicker stud walls and/or more exterior insulation than that, if you want to meet PaasivHaus standards.