Blown-in attic insulation is installed by professionals who are trained in the proper procedures for this installation. The insulation is made up of a two-chemical soup that instantly forms a material called urea-formaldehyde. The installation crew will start by removing the old insulation. They will then place a new vapor barrier in place. That done, the crew will seal the area and insert a dual-hose system involving a generator and a pump. This sprays the insulating material that expands to fill the existing space and then hardens instantly.
While you're up there, inspect for roof leaks and cut your expenses before you call.