Lime plaster is a protective coating for buildings, especially old masonry ones. It absorbs moisture and allows for evaporation, preventing cracking and erosion. It can be purchased in different styles and colors and is easy to apply with proper surface preparation. It is recommended for weak, porous, and crumbling materials.
Lime plaster is a lime-based plaster that people can apply to the walls of a building to protect it from the weather. The process of applying this product is known as rendering. Old masonry buildings are a common target for rendering and can also be used with other types of building materials. In some regions, contractors familiar with the process can apply lime plaster for clients, and in others, people may need to do it themselves.
Once hardened, lime plaster imparts numerous advantages to the underlying structure. Lime absorbs water easily, and in the rain, it will be able to absorb moisture, keeping it away from the wall. Over time, the breathability of the upholstery allows water to evaporate so that it cannot penetrate the interior walls. It has room for expansion and contraction, preventing unsightly cracking and does not trap water within the walls because any liquid evaporates through the porous surface.
Cement-sand mixes also have a long history as coatings, but lime plaster, an even older product, is actually better in terms of the protection it offers. Concrete traps water and will begin to crack and chip in cold, wet weather, exposing the underlying stone to the forces of erosion. Lime plaster protects the underlying surface, especially if people clean walls regularly and reapply at the first signs that the plaster begins to sag. It also takes paint readily, allowing people to paint structures in any color they like.
This exterior building coating is available at hardware and home improvement stores in the form of a dry powder that must be mixed with water before application. Different styles are made and colored lime plaster can also be purchased, allowing people to skip the need to paint. It is important to clean the surface well before application and to wet it to increase adhesion. In some cases, builders may recommend treating the wall with an adhesion enhancer if the material is slippery and does not adhere well to the lime-based coating.
Regions with a history of masonry construction often have houses treated with lime plaster along with contractors familiar with the process. Those preparing for the restoration and maintenance of an older masonry structure can discuss whether they need lime plaster with a contractor. Buildings made of weak, porous and crumbling materials usually need a layer of protection to keep them in good condition.
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