Alabama Contractors License Practice Exam

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Study for the Alabama Contractors License Test. Prepare with quizzes featuring flashcards and multiple-choice questions, each supported by hints and explanations. Equip yourself for exam success!

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What is the minimum R-value insulation required for supply ducts in attics?

The correct answer is: 8

The minimum R-value insulation required for supply ducts in attics is determined by building codes and energy efficiency guidelines aimed at ensuring proper thermal performance and energy conservation. An R-value is a measure of insulation's ability to resist heat flow, with higher values indicating better insulating effectiveness. For supply ducts located in unconditioned spaces such as attics, an R-value of 8 is specified to limit heat loss or gain as air travels through the ducts. This requirement is part of energy efficiency standards that help maintain comfort within the living space and reduce energy costs. Adequate insulation in these areas is crucial, especially in climates with extreme temperatures, as it contributes significantly to the overall energy efficiency of the HVAC system. The other R-value options are less than what is necessary for effective insulation in attics, failing to meet the energy efficiency standards that aim to minimize energy waste.