Dust from cellulose insulation can irritate the eyes, skin, and respiratory system. Potential Symptoms Irritation of eyes, skin, mucous membranes; blocked nose, dry nose, sneezing; hoarseness, cough and phlegm; exercise-induced dyspnea Safety and health checklist If there is existing insulation that is deteriorated, wet or moldy, it should be removed. If there is already blown-in insulation in place, cellulose can be blown over the top. In attics with fiberglass batts, the batts should either be removed, or the cellulose blown under the batts to make contact with the ceiling below. For best performance, the cellulose should cover any existing insulation and framing. Wear a dust mask and goggles.
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