Under Michigan's Energy Code, what is the minimum R-value requirement for wall insulation in Climate Zone 6?
Correct Answer
D) R-20
Michigan's Energy Code requires R-20 wall insulation in Climate Zone 6, which covers most of Michigan's lower peninsula.
Why This Is the Correct Answer
Michigan's Energy Code requires a minimum R-20 wall insulation value for Climate Zone 6, which encompasses most of Michigan's lower peninsula. This reflects the cold climate demands of the region, where higher insulation values are essential to meet energy efficiency standards.
Why the Other Options Are Wrong
Option A: R-19
R-19 is commonly used in many jurisdictions but does not meet Michigan's Climate Zone 6 minimum requirement of R-20. While R-19 is a standard insulation value, the Michigan code specifically requires R-20.
Option B: R-13
R-13 is far below the Climate Zone 6 requirement. R-13 is typically associated with warmer climate zones (Climate Zones 1-3), not Michigan's cold climate.
Option C: R-15
R-15 is also insufficient for Climate Zone 6 in Michigan. This value may apply in moderate climates but does not satisfy Michigan's more stringent energy code requirements.
Memory Technique
Zone 6 = R-20 in Michigan. Think '6 + 14 = 20' or simply remember 'cold state, higher R.' Michigan winters demand R-20 in the walls.
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