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As compared to other economical insulation options, cellulose provides good thermal performance with an R-value of 3.8 per inch. Cellulose insulation has received the highest fire safety rating (class 1), and can easily fit around items in your walls like pipes and wiring. Cellulose insulation is most often used in the cavities of walls and roofs to insulate, reduce noise, draught proof, and even provide added control against mold.
Insulating HVAC Ductwork. When insulating HVAC ductwork, use a foil faced fiberglass insulation with an R-6 or higher R-value. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Make sure the foil surface of the insulation is free of dust before applying the tape. Peel the paper backing off the tape as you apply it to prevent the tape from sticking to itself.