A contractor is installing insulation in a cathedral ceiling. According to Michigan Energy Code, what is the minimum R-value required for this application in Climate Zone 6?
Correct Answer
B) R-49
Michigan Energy Code requires R-49 insulation for cathedral ceilings in Climate Zone 6 to meet energy efficiency standards.
Why This Is the Correct Answer
Michigan is in IECC Climate Zone 6 (cold climate). The Michigan Energy Code adopts IECC requirements, which mandate R-49 for cathedral ceilings (unvented or vented roof assemblies with continuous insulation or full-cavity fill) in Climate Zone 6. Cathedral ceilings are more thermally demanding than flat attic assemblies because they lack the large air buffer of a traditional attic, making high R-values critical for energy performance.
Why the Other Options Are Wrong
Option A: R-60
R-60 is the requirement for standard attic assemblies (blown-in insulation with large attic space) in Climate Zone 7, not for cathedral ceilings in Zone 6. This is a common mix-up between attic and cathedral ceiling requirements or between climate zones.
Option C: R-30
R-30 is insufficient for Climate Zone 6 and corresponds to wall assemblies or climate zones with more moderate winters (Zone 3-4). Using R-30 in a Michigan cathedral ceiling would fail energy code inspection.
Option D: R-38
R-38 applies to ceiling assemblies in Climate Zone 5 or to certain wall assemblies. It is below the required R-49 for cathedral ceilings in Michigan's Climate Zone 6 and would not meet code.
Memory Technique
Michigan Zone 6, Cathedral = R-49. Think '49ers' for the cathedral ceiling in cold Michigan. Attic is R-60 (more room for insulation); cathedral is R-49 (limited by rafter depth).
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A contractor discovers that the electrical service entrance was installed without proper permits during a residential renovation. According to Michigan law, what is the most appropriate course of action?
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