16 C.F.R. § 460.11 Rounding off R-values.
Title 16 - Commercial Practices
R-values shown in labels, fact sheets, ads, or other promotional materials must be rounded to the nearest tenth. However, R-values of 10 or more may be rounded to the nearest whole number.
Title 16: Commercial Practices
PART 460—LABELING AND ADVERTISING OF HOME INSULATION
§ 460.11 Rounding off R-values.
