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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About 30 people, mainly students, participated in a two-day workshop in February to improve the insulation of a lecture room on the third floor. The attic floor was lined with glass-wool ...

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