Plaster polystyrene panels outside and inside

Styrofoam sheets can be plastered well outside and inside. In order for the plaster not to break up and tear with its polystyrene properties, it must be decoupled. Armierungsnetze and grids take over this function. Especially outdoors, attention should be paid to permeable plasters to prevent mold.

Reinforcement protects against breaks and cracks

Foamed polystyrene insulation panels behave differently from a plaster that covers them when exposed to heat. This circumstance is crucial for the durability and integrity of the plaster layer on polystyrene. An elastic intercepting and leveling layer is provided by a latticed fabric that decouples both materials.

To ensure the effect, not only the smooth and large plaster surfaces must be reinforced. Both when plastering outside and inside. Corners, window frames and frames must be properly "connected" especially when the exterior plaster. If the reinforcement ends without connection to the plaster edges, the plaster can break from the sides and tear. Outward-facing corners should be reinforced with right-angled edge profiles, which are also connected to the reinforcement.

System components and use

Most plaster manufacturers offer system solutions. The plasters used should preferably belong to one system or at least the same manufacturer. The typical system components consist of:

  • flush
  • Armierungsmörtel
  • Reinforcing mesh (latticed plastic mats)
  • Putzgrund
  • Covering or finishing plaster
  • Accessories such as plaster molding and fabric corner

Depending on the system and manufacturer, a flush is applied as the base coat. After roughening and drying, a reinforcing mortar is applied and the reinforcing fabric is pressed in. The fabric must overlap ten centimeters in all directions and / or be attached to accessories. In other systems, the concealed plaster also acts as a mortar and saves a separate operation. After drying, plaster base is applied, which forms the adhesion layer for the topcoat or topcoat.

Suitable cleaning methods

Suitable types of plaster are diffusing types such as acrylic plaster, mineral plasters and silicate plasters. In most cases thin plasters are the ideal choice, which lead to installation heights between eight and ten millimeters. Thick plaster can have a positive effect on the indoor climate, especially indoors.

Tips & Tricks

Think about the weight gain of your insulation layer when applying plaster. Plan the attachment of the polystyrene panels accordingly strong and take into account the manufacturer's instructions for cleaning weight.

Artikelbild: Radovan1 / Shutterstock

Video Board: Smart Technologies Latest Building Insulation - Fastest Modern Construction Built Wall Insulation