How To Get R21 In 2X4 Wall. Your original piece is probably actually 15″, and if you cut it in half lengthwise you get 7 1/2″. 'how long will it take me to get to work' calculator.
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If you've never run or seen cables run before, you could get an electrician, alarm installer or other installer to do a few runs for you while you learn about how they do. Fiberglass insulation batt helps maintain temps and control noise. My builder is planning to use 2x4 exterior wall studs with open cell spray foam insulation. With textbook solutions you get more than just answers.