Note: Each zone on the map represents an area that experiences a similar number of degree-days. Degree-days are a measure of heating demand based on the difference between the average daily outdoor temperature and 18°C (65°F). Cumulative totals for the month or heating season are used to estimate heating energy needs.

The following table is a good guideline to follow to determine insulation levels for different areas of a house.

You may wish to compare your plans with the Model National Energy Code for Houses for your province or territory. The thermal resistance values listed in the code are more accurate than the ones listed in the table above because they take into account the type of framing and heat loss through the framing materials.