MEAN TEMP|R-VALUE (h-ft²-°F/BTU) | 3″ | 12-29 4″ | 18-62 5″ | 25-32 6″ | 31-85 | 2″ | 14-16 2.5″ | 19-38 2.75″ | 21-28 3″ | 23-58 4″ | 30-86 5″ | 37-88 6″ | 44-64 | 2″ | 14-16 2.5″ | 19-38 2.75″ | 21-28 3″ | 23-58 4″ | 30-86 | 2″ | 14-16 2.5″ | 19-38 2.75″ | 21-28 3″ | 23-58 4″ | 30-86 5″ | 37-88 6″ | 44-64 |