2 Layers of Insulation

Old 02-26-02, 09:47 AM
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Question 2 Layers of Insulation

I am insulating an attic that has never been insulated. I want to use fiberglass insulation rather than blown insulation.

1. After researching websites and friends, it was suggested that R-38 or higher type insulation is recommended for the upper midwest. Is this correct?

2. The beams in the attic are 2x6's and I need about 640 sq ft. I was wondering would it make sense to use 2 layers of R-19 insulation rather than R-38/R-49 insulation--the first layer with a vapor barrier and the second layer without?

Thanks and much help appreciated,
Old 02-26-02, 08:05 PM
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Yes, if you're going to put down that much insulation, it's better to install two layers. The first layer should have the vapor barrier and should fill the floor cavity. The second layer should be laid perpendicular or across the first layer and should not have a vapor barrier.

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