Attic Insulation

There are many different ways to treat an attic properly. This all depends on the homeowner's concerns and what style of home they have. We at S & E Insulation truly believe in the benefits of cellulose insulation. Cellulose insulation provides a much higher R-Value per inch over fiberglass as well as combating thermal transmission much better.


Here in Wisconsin, in attics, it is recommended by the Department of Energy to have an R49/50 or greater. See map below:

Attic Insulation Chart - United States

How to Insulate an Attic:

Attic Insulation Instructional Chart


The image below shows the same R13 fiberglass next to R13 cellulose. As you can see in the photo, they have a temperature probe in the middle of each area with an incandescent light in the middle.

Base line without anything turned on the fiberglass is 66.2 °F inside the fiberglass
and the cellulose is 66.7°F inside the cellulose

Temperature around the exterior is Fiberglass - 65.8°F and Cellulose - 65.6°F

After 10 minutes with the light on and simulating the hot attic temperatures in the summer, you can see that the fiberglass is now 84.0 °F and the cellulose is 66.3 °F.

Temperature around the exterior is Fiberglass - 67.6°F and Cellulose - 66.3°F

This means that the cellulose does not allow the heat transmission as fiberglass does, thus leaving you home to stay much cooler.

Now we turn the light off to mimic winter conditions and how fast the heat will leave the area. As you can see, after 10 minutes of the light being off, the fiberglass is now 70.5 °F and the cellulose is 69.9 °F.

Temperature around the exterior is Fiberglass - 68.5°F and Cellulose - 66.5°F

The cellulose actually went up in temperature. What does this mean? Cellulose being a much denser product will hold temperature longer then fiberglass. This allows your home to stay warmer longer in the wintertime before the HVAC system will kick in.