If you are a builder that executes these details on every project, the cost impact is manageable. When you consider that houses are largely financed and also have operating costs that are dependent on energy efficiency, better built homes make sense on a cash flow basis.

However, the real estate industry does not properly value energy efficient projects, and most builders don't execute these details often, so they end up costing more than they should.

Another article from Fine Homebuilding goes over some of these issues: https://www.finehomebuilding.com/project-guides/insulation/d...