Cellulose insulation, as discussed in Chap. 7, is produced from recovered wood pulp materials. These include used newsprint and boxes that have been shredded and pulverized into small fibrous particles. Wet-spray cellulose, sometimes called damp-spray cellulose or water-stabilized cellulose, uses the same base material as loose-fill insulation, except that it is applied using special applicators that mix the material with an adhesive, allowing it to adhere to the surface it is applied to (Fig. 9.1). The adhesive(s) may be added to the insulation at the time of manufacture and, if necessary, activated by the addition of water when installed, or the adhesive may be added to the insulation at the time of installation.3 Application of the insulation with the glue binder and liquid purportedly results in lower-density cellulose insulations that do not settle like dry-applied loose-fill cellulose insulations. This procedure requires trained or certified contractors for this specific
Figure 9.1 Applying wet-spray cellulose. (Greenstone)
installation. Wet-spray cellulose is excellent for sound control. It can be used in walls between rooms and other areas that require sound control. Many application systems are proprietary and are designed for use with specific products and equipment.