Choose scratch plaster or disc plaster inside and outside

The question of whether a scratch plaster or disc plaster is to be applied is primarily an optical consideration. A slice plaster is like the scratch plaster a rough plaster, whose surface is less strongly structured. The irregular and roughened surface brings physical advantages with which the durability is affected.

Criteria for decision-making

Before plastering, the question often arises whether a smooth or rough plaster should be chosen. A scratch plaster is widely used as external plaster on the facade. In the interior, there is also a practical consideration in addition to the optical criteria. Coarse scratch plaster "scratches " and can cause abrasions on the skin when it is passed through people.

  • Also read - Can be used with scratch plaster outside without any problems?
  • Also read - Processing and designing scratch plaster
  • Also read - touch up scratch plaster with plaster of the same type

A scratch plaster scratches more than a window plaster. When designing the structured surface, the plastered glass develops a lower risk of mining. This argument can play a major role, especially in heavily frequented rooms such as staircases and with children as members of the household. For these reasons, a smooth lime plaster or clay plaster is preferred on interior walls thanks to felting.

Building physical advantages of a roughened surface structure

Mineral plasters develop a so-called sintered layer on the surface as they dry out and set. This creates a surface tension that can create cracks in the interior and even more so in the exterior plaster. In visual terms, this is comparable to the surface tension of water.

With scratch plaster, this sintered layer is "dissolved " and thus the susceptibility to cracks is significantly reduced. The window plaster also has this property to a lesser extent. If interior plaster is to be smoothed, it is advisable to always "leave a slightly rough structure ". The following questions will help you make the best decision:

  • Is the plaster outside of the contact zones by people (outside)?
  • Do you have children in the household who can injure themselves on interior walls??
  • The aesthetic sense tends to have smoother or rougher surfaces?
  • Should the exterior plaster be colored or painted?
  • If a more even structure (scratch plaster) or an alternating look (window plaster) is desired?
Tips & Tricks A scratch plaster often appears visually calmer than a glass plaster because of its evenness. If you apply scratch plaster, you can use this property as a basis for processing if there are no other decision criteria.