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1309 Recommended Insulation Levels - Insulation Energy Efficiency - The Basics
 
1309 Recommended Insulation Levels - Insulation Energy Efficiency - The Basics -

Image Text: Northern North America > attic > R-25 to R-40 > walls > R-12 to R-20 > floors over unheated spaces > R-20 to R-30

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INSULATION

The Basics, Air/Vapor Barriers (Vapor Retarders), Venting Roofs, Venting Living Spaces, Attics, Flat and Cathedral Roofs, Walls Above Grade, Basements and Crawlspaces, Floors over Unheated Areas, Ventilation Systems

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