Plastering a stone wall made of natural rock

A stone wall made of natural rock can in some cases be upgraded and modified in a functional and visual way by plastering. Unlike the plastering of concrete or bricks, the specific characteristics of the particular rock are decisive here. Many plasters need to develop adhesive properties.

Stone-Dependent Cleaning Technique

The plastering of a stone wall can cover unsightly surfaces or form a smooth course of walls from the uneven wall surface. Most stone walls have joints that can be filled to a certain extent during plastering. The choice of Putzart and technology depends heavily on the rock.

Soft natural stones such as limestone and sandstone have a similar absorbency and adhesion as concrete. Hard rocks like basalt and granite have very small pores and a relatively smooth surface. For plastering, it is necessary to use low-viscosity types of plaster and aggregates which have a high binding and adhesive power.

Adhesive surfaces and plaster

The decisive feature of a plaster is that it will last. Several factors influence the adhesion behavior:

  • Composition of the plaster
  • Adhesive effect
  • Diffusion behavior
  • Number of plaster layers
  • External influences such as weather or humidity

The construction of the stone wall as a drywall or mortared wall additionally influences the plastering. Generally, joints are the "weak spots" when plastering and should be neutralized as much as possible. Ideally, the open or mortar filled joints are blinded. The plaster either the "bleeding" in cavities or contact with the mortar is impossible. As a result, the plastering can be adjusted exclusively to the properties of the surfaces of the stone wall.

Priming of a cement slurry

When plastering a wall, a primer must be applied in all cases and for each type of stone. In most cases, a so-called cement slurry is used. It settles on the spin on and in the pores of the stone wall. Two to four additional layers of plaster are applied to this primer bonding layer. Opfer Aid plastering aid

Dryness of the stone wall is an important prerequisite. If efflorescence or other signs of moisture are detectable, repair with a sacrificial plaster is necessary. This strongly absorbent plaster is applied temporarily and "pulls" the moisture out of the rock.

Tips & TricksFor veneering and closing open or mortared joints, you can use slate tiles that harmonize with all natural rocks.

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