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Foam insulation is the best by far. And as you can guess its the most expensive. It does have the best R value per inch and offers the great moisture resistance as well.
Fiberglass blown in is also a good product for the DIY person. its easy to install, but you
Cellulose is also a good insulating product. Its heavier then fiberglass but installs the same way. Two people to use the equipment to install. It also must be fairly thick to achieve R values but less is needed then fiberglass to get the same values.
Dens-pack Cellulose is not a DIY install but it offers the best on retrofits and doing walls and enclosed ceilings. Dens-Packing installs three pounds per square foot of the insulation in the cavities of the home. This flattens out any old insulation and can provide good R values and offers good air sealing properties. The equipment needed to install this is different then the stuff you would rent at a rental center. While the insulation remains the same, the insulation pump can push the insulation into the cavities at a much greater pressure then the one you rent.
Regardless of what you use, you must remember that you need to be careful not to cover over open electrical boxes, ceiling lights and come into direct contact with any chimney or flue pipe when installing it. It is suggested in the attic area that air sealing be performed prior to blowing it in so that wind washing does not occur which lowers the insulation quality to prevent heat loss.