Under Tennessee building codes, what is the minimum required R-value for ceiling insulation in climate zone 4?
Correct Answer
B) R-49
Tennessee building codes require minimum R-49 ceiling insulation in climate zone 4, which covers most of Tennessee.
Why This Is the Correct Answer
Tennessee building codes (aligned with the IECC) require a minimum ceiling insulation R-value of R-49 in climate zone 4, which encompasses most of Tennessee. This high R-value reflects the state's energy efficiency goals and the zone's heating and cooling demands.
Why the Other Options Are Wrong
Option A: R-30
R-30 is the minimum for older code cycles or less demanding climate zones. Zone 4 requirements have been raised substantially in recent IECC editions, making R-30 well below the current minimum.
Option C: R-38
R-38 was the minimum in earlier code editions for climate zone 4, but current Tennessee codes have increased this to R-49. Selecting R-38 reflects outdated code knowledge.
Option D: R-60
R-60 exceeds the minimum requirement. While some builders install R-60 for energy performance beyond code, the minimum is R-49. There is no code mandate for R-60 in zone 4.
Memory Technique
Think 'R-49 for zone 4 in Tennessee.' The number 49 is close to 50 — nearly the maximum you would ever see for a ceiling minimum. Tennessee wants near-maximum ceiling insulation in zone 4 for energy efficiency.
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