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BobVila.com > Channels > HVAC > All Tips > 2x4 R15 Factor
 2x4 R15 Factor
When insulating typical 2x4 wall construction an R factor of R11 or R13 is used. To comply with Energy Star requirements, use an R15. This is the highest r value you can have in a 2x4 wall. The higher rating is achieved by adding more fiberglass to the blanket, allowing it to trap more cold air.
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