What is the recommended continuous air barrier performance for energy-efficient construction in Florida's climate zone?
Correct Answer
A) 0.40 cfm/sq ft at 75 Pascals
The Florida Energy Code requires continuous air barriers to have a maximum air leakage rate of 0.40 cfm per square foot at 75 Pascals pressure differential for energy-efficient construction.
Why This Is the Correct Answer
Option A (0.40 cfm/sq ft at 75 Pascals) is the correct air barrier performance requirement specified in the Florida Energy Code for energy-efficient construction. This standard ensures adequate building envelope tightness while accounting for Florida's hot, humid climate conditions. The 75 Pascal pressure differential is the standard testing pressure used to measure air leakage rates in continuous air barrier systems, and 0.40 cfm/sq ft represents the maximum allowable leakage rate for compliance with energy efficiency requirements.
Why the Other Options Are Wrong
Option B: 1.5 cfm/sq ft at 50 Pascals
Option B uses 50 Pascals instead of the required 75 Pascals testing pressure, and the 1.5 cfm/sq ft rate is too high, allowing excessive air leakage that would compromise energy efficiency. This rate would not meet Florida's stringent air barrier requirements for energy-efficient construction.
Option C: 2.0 cfm/sq ft at 50 Pascals
Option C also incorrectly uses 50 Pascals testing pressure rather than 75 Pascals, and the 2.0 cfm/sq ft leakage rate is significantly higher than allowed. This excessive air leakage would result in poor energy performance and increased cooling costs in Florida's climate.
Option D: 0.30 cfm/sq ft at 75 Pascals
While option D uses the correct 75 Pascal testing pressure, the 0.30 cfm/sq ft rate is lower than the actual requirement. Though this would provide better performance, it's not the specified standard in the Florida Energy Code for air barrier systems.
Memory Technique
Remember '75-40' for Florida air barriers: 75 Pascals testing pressure and 0.40 cfm/sq ft maximum leakage rate. Think 'Florida Forty at Seventy-Five' to keep the numbers straight.
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