Insulation – Cellulose

Insulating your home is one of the best ways to make it more comfortable and save money on your utility bills. Having sufficient insulation in your attic is like having a good hat on your head in the winter time, only for your house. Depending on the application of the insulation, we like cellulose for several reasons:

  1. Cellulose is a very green product made up of 85% recycled newspaper and does a great job of insulating;
  2. It is a better insulator than fiberglass batts (typically the pink insulation that is rolled out into an attic) because, unlike the batts, cellulose is a loose insulation that can get into all the nooks and crannies;
  3. Finally, it doesn’t leave weak points in between the floor joists like fiberglass bats.

Furthermore, when we blow the cellulose in an attic, it goes several inches above the floor joist creating the effect of a monolithic blanket. An ideal R-value is R-50 to R-60.

Before we add any cellulose to your attic, we first perform air sealing. Air sealing is a critical component in stopping the air from escaping out of your home. See the air sealing page for more details.

Cellulose can be applied by blowing loose fill into an open space like an attic, or by dense packing it into closed spaces like a decked attic or exterior walls. The way we dense pack an exterior wall is by removing a piece of siding and drilling a 3-inch hole into the sheathing every 16 inches in between each stud bay. Then the hose fills up the cavity at 3.5 lbs/cubic foot. We seal the hole and slide the siding back over it resulting in a minimally invasive process.

One concern people have is that with cellulose being recycled newspaper, is it flammable? Borate is one of the ingredients in cellulose insulation that acts as a fire retardant. Check out the following video and watch the demonstration as the man puts a flame torch to the cellulose in his hand.