Fiberglass
* Approved R-factor per inch thickness
* Effectiveness dependent on correct installation
* Uses entrapped air as barrier to heat transfer
* Least cost and return on investment
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Cellulose
* Higher R-factor per inch thickness than fiberglass
* Blocks air infiltration
* Best sound proofing
* Medium up-front investment yields energy savings return
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Polyurethane
Foam
* Highest R-factor per inch thickness (double fiberglass)
* Resists moisture and insects
* Seals cracks and adds structural integrity
* Largest up-front investment yields largest near and long-term
energy savings return
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