Insulation efficiency is rated through giving it an R value. The R value represents the insulation’s abillity to resist heat flow. The higher the R value is, the better the insulation resists heat flow aka the more efficient it is. The R values can sometimes be misleading because the ratings tests are done at conditions 70 degrees Fahrenheit and no air movement – usually when insulation is needed most, conditions are not so mild. The average recommended rating for US homes is R-12.
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