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Table 1 Current insulation levels in existing single-family homes by census division [13] (batt insulation assumed for all).

From: The public health benefits of insulation retrofits in existing housing in the United States

  NE MA SA ESC WSC ENC WNC MTN PA
Ceiling R-30 R-30 R-11 R-11 R-11 R-19 R-19 R-19 R-1
Above-grade wall R-11 R-11 R-6 R-6 R-6 R-11 R-11 R-11 R-6
Floor R-13 R-13 R-3.4 R-3.4 R-3.4 R-11 R-11 R-11 R-5.5
  1. Definitions of census divisions: NE (Northeast): MA, ME, NH, VT, RI, CT; MA (Mid-Atlantic): NY, PA, NJ; SA (South-Atlantic): MD, VA, WV, DC, NC, SC, GA, FL; ESC (East-South-Central): AL, MS, KY, TN; WSC (West-South-Central): TX, OK, AR, LA; ENC (East-North-Central): MI, IL, OH, IN, WI; WNC (West-North-Central): MO, IA, MN, SD, ND, NE, KS; MTN (Mountain): ID, MT, NV, AZ, NM, UT, CO, WY; PA (Pacific): CA, OR, WA. Note: The R-value represents the resistance of the insulation to heat flow, with higher values indicating greater resistance. R-values are given in units of °F.ft2.h/BTU.