JetSpray™ Six-Step Installation Process

It’s easy to install JetSpray Thermal Insulation. Just follow this step-by-step guide.

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Sweep the area, net any unbacked walls, and mask HVAC and electrical boxes.

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  • Remove or properly secure any nails or staples that will impede or damage the scrubber.
  • Air seal any gaps, joints and/or penetrations in the wall cavities; chink or backfill any large gaps or cracks prior to air sealing.
  • Knauf recommends using EcoSeal Plus™ as a high-performance air sealing system.



Set up your blowing wool machine, water pump, and attach hoses.

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  • Attach spray nozzle to fiber feed line and water supply line.
    • In cold weather, protect liquid supply lines from freezing.
  • Plug scrubber into power source.
  • Attach vacuum suction attachment (VSA) to vacuum line.
  • Conduct Flow and Feed Rate checks.



Stand 36″-40″ from the wall holding the nozzle at a 10° downward angle. Move side-to-side, upward. Within 10″ from the top of cavity, step closer, 18″–24″, and fill top of cavity.

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  • Engage fiber flow and then start the water supply once fiber is flowing.
  • From bottom of cavity, move side-to-side in an upward direction.
  • Within 10″ from the top of cavity, step closer, 18″–24″, and fill top of cavity.
  • In a downward motion, fill in any voids or gaps in the cavity just filled and move to next cavity and repeat.



Scrub the walls of excess. Then vacuum excess material, and refeed into the hopper.

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  • Make sure to repair any voids or gaps created during scrubbing.
  • Vacuum excess material regularly into the collector box at the blowing machine.
  • Introduce refeed into the hopper while maintaining an adequate supply of virgin material in the hopper.



Randomly conduct density and moisture checks to ensure proper coverage.

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  • Follow instructions that came with the Densi-Checker.™
  • Make adjustments accordingly.
  • Conduct three to four moisture checks (beginning, middle and end) with the moisture meter to ensure you are installing between 18–22%.
  • It is recommended that a moisture check be made prior to drywall or vapor retarder installation, ensuring a moisture reading <15%.



Remove any excess material from the site, and remove window, HVAC and electrical box coverings.