If you are looking strictly at economics, then blown attic insulation is the very best alternative you have. Another positive aspect of this type is that it is fairly simple to set up. There are typically two kinds of product made use of for this type. They are fiberglass and cellulose. Fiberglass is currently a more popular choice. The replacement generally takes about one to 2 hours.
The normal install of blown attic insulation begins with an installer beginning in the far corner of your attic with a hose from a blowing elliptical trainer. This machine is typically mounted on a truck. The installer will cover your attic with a full uniform layer of insulation.
If you choose to install batt insulation over blown attic insulation, keep in mind that it will cost more. It does have its benefits as well. The most popular type of batt insulation is fiberglass. A less well-known type is cotton fiber. Obviously, the cotton type is a healthier alternative than fiberglass.
The R-factor of batt is a little better than blown attic insulation. The blown in thickness will cause variations in the R-factor for this type of insulation.
One of the best advantages of blown attic insulation over batt is that the blown style covers everything; while there can be open locations in the batt type.