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R-values

Which of the following types of insulation has the highest R-value?
1. 2" thickness extruded expanded polystyrene (XEPS) board
2. 3" thickness of loose-fill fiberglass
3. 4" thickness mineral wool batts

AnswerFrom highest to lowest: 3. mineral wool batts = 14, 1. XEPS = 10, 2. loose-fill fiberglass = 6.6-8.1
ARE 4.0 exam prep: BDCS

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