Roxul ComfortBoard IS - Manual (Page 21)

INSULATING SHEATHING FOR RESIDENTIAL CONSTRUCTION APPLICATION GUIDE 19
Recommendations for thermal control by climate zone
Figure 9: North American Climate Zone Map
(based on ASHRAE Standard 90.1-2007)
Zone 1 1A - Very Hot-Humid with 5000 < CDD10ºC (9000 < CDD50ºF)
1B - Dry with 5000 < CDD10ºC (9000 < CDD50ºF)
Zone 2
2A - Hot-Humid with 3500 < CDD10ºC ≤ 5000 (6300 < CDD50ºF ≤ 9000)
2B - Dry with 3500 < CDD10ºC ≤ 5000 (6300 < CDD50ºF ≤ 9000)
Zone 3
3A - Warm-Humid with 2500 < CDD10ºC < 3500 (4500 < CDD50ºF ≤ 6300)
3B - Dry with 2500 < CDD10ºC < 3500 (4500 < CDD50ºF ≤ 6300)
3C - Warm-Marine with CDD10ºC ≤ 2500 AND HDD18ºC ≤ 2000 (CDD50ºF ≤ 4500 AND HDD65ºF ≤ 3600)
Zone 4
4A - Mixed-Humid with CDD10ºC ≤ 2500 AND HDD18ºC ≤ 3000 (CDD50ºF ≤ 4500 AND 3600 < HDD65ºF ≤ 5400)
4B - Dry with CDD10ºC ≤ 2500 AND HDD18ºC ≤ 3000 (CDD50ºF ≤ 4500 AND 3600 < HDD65ºF ≤ 5400)
4C - Mixed-Marine with 2000 < HDD18ºC ≤ 3000 (3600 < HDD65ºF ≤ 5400)
Zone 5
5A - Cool-Humid with 3000 < HDD18ºC ≤ 4000 (5400 < HDD65ºF ≤ 7200)
5B - Dry with 3000 < HDD18ºC ≤ 4000 (5400 < HDD65ºF ≤ 7200)
5C - Marine with 3000 < HDD18ºC ≤ 4000 (5400 < HDD65ºF ≤ 7200)
Zone 6
6A - Cold-Humid with 4000 < HDD18ºC ≤ 5000 (7200 < HDD65ºF ≤ 9000)
6B - Dry with 4000 < HDD18ºC ≤ 5000 (7200 < HDD65ºF ≤ 9000)
Zone 7 Very Cold with 5000 < HDD18ºC ≤ 7000 (9000 < HDD65ºF ≤ 12600)
Zone 8 Subarctic with 7000 < HDD18ºC (12600 < HDD65ºF)
HDD = Heating Degree Days
CDD = Cooling Degree days
Starting with the climate zone in which the project is located (Figure 9 above); use Table 2 below to find
the recommended total R-value of the wall assembly. Recommendations for other enclosure elements
are also provided.