R-Value is a measure of insulation’s ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.Click to see full answer. Hereof, how thick does blown insulation need to be? Cellulose Blown in Attic Insulation R-Value Minimum Thickness Bags per 1000 Sq Ft R44 13.4” 66.2 R38 11.6” 55.5 R30 9.3” 42.7 R19 6” 24.8 Likewise, how thick is r48 insulation? Compare all Specifications Insulation Location Attic Insulation Location Ceiling Roll or Batt Batt Roll or Batt Batt Product Length (ft.) 4 ft Product Length (ft.) 4 ft Faced or Unfaced Faced Faced or Unfaced Faced Product Thickness (in.) 14 in Product Thickness (in.) 8.25 in Also to know is, how many inches of blown insulation is r60? In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. For loose-fill cellulose, this translates to a total depth ranging from 8 inches up to 16 inches.How much blown insulation do I need calculator?To determine how much cellulose insulation you need, take the square footage of the space and divide it by either the depth or the desired R-value. Fiberglass blow-in insulation is essentially made up of spun fibers from recycled molten glass.
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