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  • Comes compacted in bags and is poured or blown into walls and between joists of the attic floor.
  • Good for retrofitting insulation into previously uninsulated homes.
  • Each bag is labeled according to federal specifications for both mineral wool and cellulose. Left column lists the R-value, second column tells how many bags are needed to cover 1,000 square feet of attic floor area, the third column gives the minimum thickness after completing the job.
  • Some manufacturers have two columns on thickness for loose-fill and cellulose insulation. The second of these is labeled “settled density”. This is important since cellulose settles quickly.
  • Types include fiberglass rock wool and cellulose. Cellulose is made from waste paper that has been treated to be fire retardant. It is also less likely to cause skin irritation.

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