A homeowner purchases insulation for her attic rated at R-15.She wants the attic insulated to R-30.If the insulation she purchased is 10 cm thick, what thickness does she need to use?

Question

Quizplus · Accepted Answer

The R-value of insulation is directly proportional to its thickness. To double the R-value from R-15 to R-30, the thickness also needs to be doubled. Therefore, if the 10 cm thickness provides R-15, then 20 cm will be needed to achieve R-30.

A Homeowner Purchases Insulation for Her Attic Rated at R-15