Styrofoam with plaster or a cladding disguise

When using Styrofoam as insulation material, a disguise is commonly common. In other forms of use, a coating with plaster or an attached panel from another material may be useful. It should be noted that the expansion properties decoupled and the airtightness is observed.

Decouple indispensable

Naked styrene surfaces are not very handsome. There is also a damage and deformation risk when sticking open styrofoam on walls. The disguise in the area of insulation is usually realized by plastering. Also possible are shuttlings for example from façade plates.

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When styrene plates are plastered, the plaster order must be decoupled by a reinforcing layer. Without this intermediate layer, the difference in temperature fluctuations between styrofoam and plaster effects directly on the panel and the plaster tears. Decoupling is also required when plastering inside.

Note building physics

Inorganic materials such as plasterboard and hardboard can be attached over a layer of styrofoam. Organic materials such as wood must be decoupled by spacing and ventilation. When covering styrofoam with plaster of paris, as is the case with sculptures and reliefs, a "breathing opening" is recommended.

The following effects and properties must be considered and taken into account in terms of building physics before each cladding of Styrofoam:

  • Non-breathable plastic layer leads to sweating under the cladding
  • Styrofoam expands differently than other building materials when it is hot or cold
  • Soft and elastic properties must be diverted from outside when exposed to loads
  • A cladding that is glued over the entire surface can hardly be disposed of afterwards

Diffusion behavior problem

To smooth and harden the surface, light mortar (€ 7.79 at Amazon *) and types of plaster can be used. The resulting increase in weight is absorbed by plate anchors. Mechanical spacers can provide ventilation between the styrofoam and the cladding.

If lines and pipes are clad with styrofoam, air outlet openings must be integrated. In the event of temperature differences, you avoid the almost inevitable formation of condensation and condensation water. Inspection access is recommended for all clad styrofoam constructions in order to be able to discover and remedy any moisture that may arise later.

Tips & Tricks If you build cladding with rear ventilation, pay attention to the fire protection regulations. Incorrectly placed air ducts act like a chimney in the event of a fire and lead into an inferno.