Loose fill, also known as “blown” or “blown-in,” is insulation applied by pneumatic equipment through a hose and into attics, walls and ceilings. Loose fill insulation is sold in bales that are fed into the machine, which uses air pressure to fluff clumps out of the insulation and blow it outward to form a blanket.
Loose fill insulation has a tendency to settle over time, which reduces effectiveness somewhat. Do-it-yourselfers can successfully add cellulose or fiber glass loose fill to improve attic insulation. Insulating closed walls, ceilings or cathedral ceilings, or the use of rock wool loose fill, is best left to professional installers properly trained in both safe installation practices and preventing insulation gaps.
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