so you can multiply the R-value by the thickness of the insulation to get the total R-value of the layer. Fiberglass insulation is made of fine glass fibers that trap air and slow down heat transfer.

Doing so will reduce the thickness of the material underneath and thereby lower its R-value. There is one exception to this general rule: When attic temperatures drop below 0°F, some low-density, ...

Inspect and measure the thickness of any insulation you find there. It will most likely be a fiberglass batt, so multiply the thickness in inches by 3.2 to find out the R-value (or the R-value might ...

Insulating your attic walls is one of the best ways to get your home optimal energy efficiency. The amount of insulation ...

Insulation types with higher R-values offer better performance. For attic walls, the recommended R-value varies based on climate zones. Each type has pros and cons. For example, fiberglass ...

Carefully roll or lift fiberglass batt insulation ... Department of Energy’s guidelines for recommended insulation levels (measured in R-value) based on your climate zone.