WEM Universal Clay Plaster

Technical Data

Product name	Universal dry clay plaster, DIN 18947 – LPM 0/2 f – SII -1.8
Scope of application	Single- or multi-layer indoor plaster suitable for plaster-throwing machines or manual application on all sub bases appropriate for rendering. Due to its composition, the plaster is a perfect heating plaster for radiant wall heating systems. It embeds the pipe and conducts the heat from the heating pipe to the wall surface.
Properties	Composition: Milled construction loam, quartz sand, natural fibres Coating thickness: 5 to 23 mm Grain group/grain oversize: 0/2 mm Bulk density class: 1.8 Drying shrinkage: < 2.5 % Strength class: S II Compressive resistance: 2.2 N/mm² Flexural strength: > 0,7 N/mm² Adhesive strength: ≥ 0.1 N/mm² Thermal conductivity: 0.91 W/(mK) Vapour diffusion resistance class: WS III Material class: B2 Abrasion: 0.1 g
Storage/ storage life	In a dry storage place, the shelf life of the plaster is unlimited.
Coverage	25 kg Clay Universal Plaster gives 16.6 litres of rendering mortar. This quantity is sufficient for a surface of approx. 1.66 m2 with a coat thickness of 10 mm or for a surface of 0.72 m2 with a coat thickness of 23 mm (approx. 1.506 kg/m2 per mm application thickness).
Processing	Add 5.4 litres of water to 25 kg of plaster. The sub base must be clean, free from film-forming separating agents and sufficiently rough because the clay plaster adheres mechanically. Pre-wetting is not necessary. Apply the plaster either manually with a trowel or with a plastering machine. If a single coat is applied, it may have a thickness between 5 and 23 mm. You can apply multiple coats, however.
Workability and drying	The ready-mixed material remains workable for several days if stored in a closed recipient. You may have to add some more water before reuse. Operate the wall heating at a supply temperature of 30 to 45 °C immediately after the application of the clay plaster to accelerate the drying process. Remove moisture through cross ventilation or with a dehumidifyer. If you cannot operate the heating you must use appropriate machinery for drying. Consider the drying report of the German Association for the Promotion of Clay Building Materials (DVL). (www.wall-heating.com/tp).
Finishing	Apply subsequent paint or plaster finishes only after all plaster layers have dried completely.

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.)