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Spray cellulose fills stud cavities completely, sealing off most air leaks and preventing convection within the wall. Cellulose insulation is made by a milling process that grinds together two raw materials: paper stock and chemicals. The chemicals are fire retardants, corrosion inhibitors, and, in the case of spray products, adhesives and wetting agents. There are two major types of cellulose: loose-fill and sprays. Loose-fill is blown into attics and existing closed walls. numbers. Its biggest market is in multifamily projects in urban areas. It can be loose-filled, or spray applied ...

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