NIA Thermal Insulation Inspector Practice Questions - NIA Certified Thermal Insulation Inspector Exam

What is the primary purpose of a vapor retarder on insulation applied to a below-ambient (cold) pipe?

To increase the R-value of the insulation To prevent water vapor from migrating to the cold surface and condensing inside the insulation To provide fire resistance To make the insulation easier to clean

Correct Answer:

To prevent water vapor from migrating to the cold surface and condensing inside the insulation

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