AZ ROC C-40 Insulation Practice Questions - Arizona ROC C-40 Insulation Examination Exam

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In conventional 2x4 wood stud wall framing spaced 16 inches on center, wood studs create a 'thermal bridge' across the insulation layer. Why does wood stud thermal bridging reduce overall assembly thermal performance?

Wood absorbs ambient moisture which destroys cavity insulation R-value. Wood studs reflect radiant heat back into the interior living space. Wood studs increase air infiltration rates through the wall cavity. Wood has higher thermal conductivity (lower R-value per inch) than cavity insulation, allowing faster heat flow through studs.

Correct Answer:

Wood has higher thermal conductivity (lower R-value per inch) than cavity insulation, allowing faster heat flow through studs.

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