Insulation Type R-value per Inch of Thickness
Fiberglass blanket or batt 3.2
High performance fiberglasss batt 3.8
Loose-fill fiberglass 2.5
Loose-fill rock wool 2.8
Loose-fill cellulose 3.5
Dense-pack cellulose 4.0*
Expanded polystyrene board 3.8
Extruded polystyrene board 4.8
Polyisocyanurate board, unfaced 5.8
Polyisocyanurate board, foil-faced 7.0
Spray polyurethane foam 5.9
* Dense-pack cellulose R-value provided by
US Housing and Urban Development (HUD) ToolBase Services
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