Internal Wetting System

iwsWhen spraying cellulose into an attic, a nuisance cloud builds up preventing clear visibility. To reduce this cloud, it is necessary to add a small amount of water to the material so that it weighs down the dust. The internal wetting system adds a small amount of moisture. After the cellulose has been sprayed, the top layer of cellulose creates a thin crust that stabilizes the material in the attic. This helps minimize the material from falling into the access hole opening.

When adding an internal wetting system, you will need to minimize the build up of damp fibers in the hose. We accomplish this in two ways:

  • You will need a double-blower machine. The extra air reduces progressive build-up of fiber and gives you an extended range with damp fibers. You should be able to get at least 80% production rate at 150 ft. of hose with this IWS system and double blower feature.
  • Another aspect of reducing the plugging in an internal wetting system (IWS), would be going from a 3″ hose up to a 4″ IWS tube and hose for several feet then reducing back down to 3″ for the remainder of your hose length.

Setup Option 1: Connecting to an on-site water source using a standard garden hose

  • A: Water supply from either a hose bib or water tank
  • B: Power supply: This plugs into the circuit panel on the machine labeled IWS. The power automatically turns on and off with the blower.
  • C: Double jet: Two jets introduce a mist of water to the cellulose in a cast aluminum coupler.
  • D: A section of 3” hose from the machine, increasing to a 4” hose, then back down to a 3” hose.


Setup Option 2: Carrying water in a storage tank in a truck

  • A: Internal Wetting System
  • B: Water Pump
  • C: 100 gallon Water tank
  • Inset: Double blower (identified by two blower controls), and specially wired outlet for the IWS which is synchronized with the blower to start and stop water spray