R-Values of Common Types of Insulation

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 Type  R/Inch
Blown Pink or Yellow Fiberglass
2.2
Blown White Fiberglass 
(certainteed Insulsafe)
2.8
Blown Rockwool
2.8
Blown Cellulose
3.7
Batt Fiberglass
3.1
Batt Rockwool
3.2
Polystyrene (extruded)
5.0
Polystyrene (molded)
4.0
Polyurethane (unfaced)
6.0
Polyisocyanurate (unfaced)
6.0
Polyurethane (skin faced)
7.1
Polyisocyanurate (skin faced)
7.1
Loose Fill Vermiculite
2.4
Loose Fill Perlite
2.8

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