AL Insulation Practice Questions - Alabama Insulation Contractor Examination Exam

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Installing polyethylene vapor barriers on both the interior and exterior sides of a wall cavity is generally discouraged because:

It can trap moisture in the cavity with limited drying potential It always increases R-value beyond code maximums Polyethylene dissolves wood instantly It is required by every energy code

Correct Answer:

It can trap moisture in the cavity with limited drying potential

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