Attic Insulation Squish Down

When you compress fiber glass batt insulation the r value per inch goes up but the overall r value goes down because you have less inches or thickness of insulation.

Attic insulation squish down. Before blowing in your insulation you ll need to create a barrier to keep the insulation from falling into areas where you don t want it like your walkway or down the attic hatch. The north american insulation manufacturers association naima has a little two page document about compressing fiberglass insulation pdf. When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. Place a 2 inch by 3 inch board directly on top of the joist nearest to the edge of the attic with its largest.

Walk to one end of the attic by carefully stepping only on the wooden ceiling joists. You can use a piece of rigid foam and attach it with cap nails. More insulation installation tricks and tips work from the perimeter of the attic toward the door or hatch so that you don t trample all over the insulation you just. Add the right kind of insulation.

But while many see the benefits of insulating our houses. 6 25 batt 5 5 cavity depth 0 75. Subtract the cavity depth from the thickness of the batt in inches. Let s look at an r 19 batt in a 2x6 cavity step 1.

Here s what they say. Fiberglass insulation a man made mineral fiber con structed from a variety of materials such as sand and recycled glass is the most popular form of insulation in the united states more than 90 percent of homes in america are lined with the pink stuff source. Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target r value and.