R-value effective
Key efficiency factor
Effective R-value rates the heat loss resistance of non-attic ceiling assemblies.
Ceilings with higher R-value are more energy efficient… more
Effective R-value rates the heat loss resistance of non-attic ceiling assemblies.
Ceilings with higher R-value are more energy efficient.

Ceiling assemblies typically include structural, insulation and sheathing components. less
Typical range of NEW insulated non-attic ceiling assemblies:
R30 effective
Ceilings no attic
R35 effective
Ceilings no attic
R45 effective
Ceilings no attic
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