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In most aspects of building, the key to quality is to do the basic things right. With insulation, this usually means installing that most basic of insulating materials, fiberglass batts, in a way that won't compromise their performance. Batts are carefully manufactured to have a specific insulating value, as indicated by the rated R-value. To keep its R-value, however, a batt must not be compressed or crushed during installation. Batts should completely fill the stud cavity, fitting snugly against every piece of framing, the sheathing, and the drywall. If they don't fill the space evenly, or if they get crushed, you lose R-value. For example, when a standard 61/4-inch-thick, R-19