Inorganic fibers will not absorb moisture. Inorganic fibers will not absorb moisture. Insulation is not effective when wet. Installed Stability Fine, dust-like fibers are highly subject to drifting. Light, fluffy fibers are highly subject to drifting.
Long fibers interlock when installed, giving good resistance to drifting.
During windy weather, the air movement in highly ventilated attics makes cellulose and fiberglass subject to drifting. Sound Reduction Good. Sound reduction is generally related to density. Higher density gives better sound reduction.