Process mounting foam

Neither in the construction trade nor in the home improvement this product is indispensable today: mounting foam, also known as PU foam. Everything you need to know about processing mounting foam is summarized below.

Mounting foam and its numerous designations

Mounting foam is something of an all-rounder. The foam is used for a wide variety of work. Therefore, it is also available under many different names. Below is a small selection for the other terms for mounting foam, so you realize that it is ultimately always the same product, but may well be different:

  • building foam
  • PU foam or PUR foam
  • insulating foam
  • insulating foam
  • Fill Foam window foam or window mounting foam (also door or frame foam)
  • situ

Process 1K or 2K assembly foam

First, a distinction is made between 1-component mounting foam and 2-component mounting foam. 1K mounting foam requires water for setting and curing. Therefore, the area to be filled is sprayed in advance with water. Even after application, the PU foam is sprayed with water again. Unlike 2K foam, it takes a relatively long time to dry. In addition, this mounting foam should not be processed at very low temperatures from just before freezing.

Process mounting foam from the spray can or with foam gun

Another distinction in the processing of mounting foam there is the required tool or how the mounting foam was purchased. There are cartridges that are suitable for a foam gun. Most of the PU foam but used in spray cans. Both components are usually mixed in the can, which is why it can be processed within eight minutes. With the foam gun, the mixing takes place in the gun, which is why you can work in stages over a longer period of time.

Differences between mounting foams

Of course, there are still different differences in consistency. Conventional 2K mounting foam expands by at least 50 percent when sprayed. With 1K mounting foam, there are products that virtually do not foam or only very slightly.

These are then often mounting foams, which are offered as Zargenschaum. Because under no circumstances may the foam behind a door frame to expand too much. Overlapping foam is simply cut here as well as in all other applications.

On which fabrics you can process mounting foam

You can process mounting foam on many building materials. These include many mineral plasters, concrete, masonry, wood, metals and many plastics. On the other hand, good workmanship is not at all possible on glass, plaster, silicone, ceramics, PP and PE plastics.

The window installation with mounting foam

In the past, mounting foam was also used in window and door assembly. Today, however, the guidelines for window and door assembly according to RAL have changed. Although PU foam can still be used, but no longer from the inside to the outside of the soffit. Only inside on the outside to achieve a clean finish after the joint tape (Kompriband). So do not confuse both uses.

Tips & Tricks

Windows are no longer insulated with construction foam, because the PU foam has a basically good thermal insulation value, but is permeable to diffusion. As a result, the assembly foam can no longer be processed in today's airtight building envelope for energy-saving houses.

Product Image: Yunava1 / Shutterstock

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