That means your attic is insulated to about R-49 ... and rafters in ceilings, floors, and walls. Insulation sold in barrel-like rolls must be unspooled and cut to fit using a utility knife.

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Without the right insulation R-values, hot and cold air alike can flow right through a home’s flooring, walls, ceilings, and attic. But what exactly is R-value, and what does it have to do with ...

The right insulation can ease your summer and winter energy bills while keeping your home more comfortableAdding insulation ...