Evolution of thermal insulation
Blowing insulation materials
Typical blowing insulation materials

Blowing Injection Methods

When a blowing injection method is used, the insulation material is installed in the building element with an insulation blowing machine, hence the term "blowing insulation". The compressed material is then loosened by the machine and thus prepared for further processing. The conditioned insulation material is transported through a hose to the building element which needs to be insulated. In the building element, the insulation material spreads out space filling and is redensificated by pressure. At the end of this process, the thermal insulation is installed.

We differ the following methods:

  • Open/attic blowing
    • Without addition of moisture
    • With moisture addition
  • Dense blowing
    • Hose blowing
    • Insulating needle technique
  • Ventilated dense bowing
    • Blowing injection with ventilated rotary nozzle
    • Blowing injection with ventilated lance
  • Damp spraying/CSO
  • Cavity wall insulation
  • Element filling in off-site/prefab construction

Open/Attic Blowing


Open/attic blowing illustration

The insulation material is blown onto a top-opened face. The top-floor ceiling is often insulated this way.
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Dry Injection


Dry injection illustration

The insulation material is blown into a completely boarded element through an injection hole. This is mostly done using a hose or an insulating needle. The element is initially filled from bottom to the top with the loose material.
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Ventilated Dense Blowing


Illustration of ventilated dense blowing

The blowing insulation of walls and similar building elements can be done using ventilated rotary nozzles or ventilated injection lances. This method moves the air which transports, spreads and densifies the insulation material controlled out of the building element.
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Damp Spraying/Fire Protection

Illustration damp spraying/CSO

The damp spraying method works with water; the insulation material is dampened with water upon leaving the hose. The humidity causes a loosening of the Lignin in the insulation material and a conglutination of the material. The damp insulation material can now be permanently applied onto walls and roofs.
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Cavity Wall Insulation


Illustration cavity wall insulation

This method is used for cavity walls. The space between the brick walls is filled with mineral wool (glass wool/rock wool), loose bulk material like EPS granules or mineral granules.
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Element Filling Systems


Illustration of stationary filling systems

Element filling systems use different blowing injection methods and automated blowing insulation. There are different procedures for closed elements but open elements can also be filled with loose insulation material.
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