We're building a "carriage" home in a new development. It's basically a twin home with a full basement; we have another home adjoining ours.
We have an "energy efficient upgrade" option that we're trying to decide.
It would upgrade the R-13 insulation to R-15 at the side walls and the R-30 to R-38 at flat ceiling areas. It is a $1800 option, we live in NJ, and our house will be heated with gas.
I looked at some charts regarding insulation on the internet & any other insight/opinion would be appreciated. Also, would the upgraded insulation add any value toward a better sound barrier for our adjoining neighbor? Thanks!
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