No other insulation takes less energy to produce, uses more recycled content, or is less toxic to humans than cellulose. It has respectable R-values, resists air movement, absorbs sound, and is highly resistant to fire, pests, and moisture. No insulation is perfect for every situation, but my first choice whenever it will do the job is cellulose. A lot of older attics feature a thin layer of flaky, dusty cellulose, blown in sometime between the 1950s and 1970s, but cellulose didn’t really take off until the 1990s, when high-powered blowers, insulation netting, borate treatment, and fiberizing combined to create an insulation product that was cost-effective and versatile with three common methods of installation: loose-fill, dense-pack, and damp-spray.
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