lime plaster

What is lime plaster and how is lime processed

What is lime plaster

Lime plaster is always a mixture of quick lime, which is the binding agent, and suitable sand. The sands in the finished lime plasters are perfectly matched to the application and make it easier to work with the plaster.

Lime plaster is an ecologically and biologically recommendable building material, as it contributes to healthy living with its diffusion-open and mold-resistant properties. Coarse or even insulating base coats and fine, smooth finishing coats can be made from lime and proper sand, which are equally suitable for interior and exterior walls. You can buy lime plaster at Lehm-Laden from well-known manufacturers such as Otterbein and Hessler. The large selection of products is divided into different categories based on the areas of application. In addition to the high quality of all our products, we also ensure that you can see their composition. Of course, we therefore declare them as transparently as possible.

The additives that you might find in our plasters are celluloses or caseins. Cellulose in a ready-to-use mortar is building biologically justifiable. It holds back the water in the plaster during processing, as it must not dry out too quickly.

Cement is mixed in with many finished plasters. This changes the properties of the plaster significantly: A cement-based lime plaster is no longer so soft and flexible and its diffusibility is also reduced: it can no longer absorb and release as much moisture. Almost all lime plasters from Hessler and Otterbein that you can buy at Lehm-Laden are cement-free (and it is declared for the few products for plastering facades), so that the plasters are perfect for renovating old buildings and the framework.

Plaster with lime

When working with lime, the first thing to think about is safety: unlike clay, lime is alkaline and can irritate the skin and eyes. We hereby expressly recommend wearing protective goggles and gloves!

As with any plaster, a multi-layer structure is also useful for lime plaster. For coarse substrates and thick layers, a lime base plaster is used, which is also suitable for filling the cavities between the pipes of a wall heating system. Mesh layers can then be implemented with an alkali-resistant reinforcement fabric, for example a starched jute mesh or a so-called glass fiber mesh, and the base plaster.

Finally, a fine-finish lime plaster or fine lime colored plaster is usually applied. These finishing renders can be colored individually with quick-lime pigments (attention: precise documentation or a recipe is necessary to reproduce the exact shade!), or by adding pigments or effect surcharges they enable creative surface designs. Special substrates require special lime plasters. The lime insulation plaster is ideally suited as interior insulation, either as a full-surface insulating plaster or as a single-layer lime insulation plaster. An application thickness of only 3 cm causes a clear difference in surface temperature and room climate.Suitable substrates for a lime base plaster are bricks, masonry, concrete, plaster bases, load-bearing old plaster, mineral insulation boards and such boards made from renewable raw materials. Lime finishing plasters are also available "in very noble": With Tadelakt, Lime smooth or Marmorino you can create  very special surfaces, but these techniques require a lot of specialist knowledge, experience and craftsmanship.