WEM Clay Fine-Finish Plaster
Technical Data
| Product name | Clay plastering mortar DIN 18947 – LPM 0/1 f – SII 1.8 |
|---|---|
| Scope of application | Single- or multi-layer indoor plaster suitable for plaster-throwing machines or manual application. Suitable as finish plaster on WEM Universal Plaster or any other surface appropriate for plastering and for plastering WEM Climate Elements and Clay Climate Panels. |
| Properties | Grain group/oversize grain: 0/1 mm; application thickness from 3 mm min. to 5 mm max.; bulk density class 1.8; drying shrinkage rate: 1.6 %; strength class: S II; compressive strength: 2.4 N/mm²; tensile bending strength: 0.8 N/mm2; adhesive strength: 0.27 N/mm²; thermal conductivity: 0.91 W/(mK); water vapour diffusion resistance: 5/10; material class B2*; abrasion: 0.7 g * Higher classification is subject to a verification of available fire protection certificates (Lehmbau Regeln DVL 2009, p. 97) |
| Composition | Ground construction clay; quartz sand: 0 to 0.5 mm; sisal fibres |
| Storage/ storage life | Unlimited storage life if stored in a dry environment. |
| Coverage | 25 kg of clay fine-finish plaster deliver 16.6 litres of rendering mortar. This quantity is sufficient for an area of approximately 5.5 m² with a layer thickness of 3 mm. |
| Processing | Add approx. 5.6 litres of water to 25 kg of plaster powder. The subgrade must be clean, free from dust and film-generating separating agents, and the surface has to be sufficiently coarse to allow the mechanical adhesion of the clay plaster. Treat surfaces that are not uniform, excessively smooth or critical with WEM primer prior to plastering. Previous moistening is not required. Either throw or trowel the rendering mortar onto the wall surface manually or use a plaster-throwing machine. The maximum plastering thickness is 5 mm per layer. Depending on the processing time, you can apply different textures to the surface. As a rule, the texture is finer, the later you score or treat the plaster surface with a sponge. A smooth surface is obtained by post treatment with a smoothing trowel. |
| Processing time/ drying | The mixed material remains workable for several days if it is covered properly. When reusing it, you might be required to add some more water. |
| Painting/other coating | Do not apply any paint or other coating before the mortar layers have dried thoroughly. We recommend using diffusible coating materials that support the favourable properties of the clay plaster. |
Apply finish coats in accordance with the clay building rules (Lehmbau-Regeln (3.9)) of the German Association for Building with Earth DVL (Dachverband Lehm e.V.)