The supplemental separates the province into two zones: Zone 1 for those areas with less than 5000 heating degree days, and Zone 2 for those areas with 5000 or more heating degree days.

Once you have the zone determined you need to determine the space heating equipment Annual Fuel Utilization Efficiency (AFUE). This will allow you to determine the table of required R-values that corresponds to the building you are insulating.