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A higher Rvalue means that the insulation will do a better job of holding in conditioned air, whether that's heat in the winter or cool air in the summer It's not about how much heat the insulation retains, but how slowly it allows heat to move through it The slower, the betterTypical recommendations for exterior walls are R13 to R23, while R30, R38 and R49 are common for ceilings and attic spaces See the Department of Energy's (DOE) ranges for recommended levels of insulation belowFor example, insulation that is compressed will not provide its full rated Rvalue The overall Rvalue of a wall or ceiling will be somewhat different from the Rvalue of the insulation itself because heat flows more readily through studs, joists, and other building materials, in a phenomenon known as thermal bridging Underfloor Insulation What Is R Value How Does It Work R insulation rating definition