Achieving R60 in attic roof deck with 2×4 studs?

I live in Zone 4A (Home was built in 2005) and I’m in the planning stages of converting my vented attic to conditioned/air sealed. Cost is going to be a… I live in Zone 4A (Home was built in 2005) and I’m in the planning stages of converting my vented attic to conditioned/air sealed. Cost is going to be a…Read MoreGreenBuildingAdvisor