How to cast a plaster on the wall?

Posted by basshopper on March 3rd, 2019

The plaster is the top covering layer covering the walls. The plaster creates a smooth surface and covers the unevenness of the masonry. Depending on the use, we distinguish indoor plaster in the interior of buildings or outdoor.

Before you begin to plaster the masonry, you need to provide a quality base that must meet certain parameters:

* equal
* solid and bearable
* absorbingly cohesive
* technologically dried
* must not be frozen

Surface penetration coatings or cement sprays are used to ensure good surface finish. In regions where other elements with other physical properties are embedded, a reinforcement network for core plasters needs to be inserted. The network will ensure that no dilation cracks occur. It should be placed in the upper layer of plasters.

Mixing plaster

Pre-prepared plaster mixes are available at every corner. You can prepare it at home. Raw material ratio for lime stucco that is ideal for brick walls: bottom core - 1 cubic cubic sand, 0.31 cubic lime slurry and 290 liters of water. Topcoat - 0.75m cubic fine sand, 0.34m cubic lime slurry and 250 liters of water.

If plaster is applied to a base containing old plaster, it is necessary to scrape off the paint, moisten the cleaned surface and roughen the masonry hammer. You can recognize the correct consistency of the plaster by not walling.

Internal plasters

Inner plasters are a multilayer system. Direct cement spraying is applied directly to the masonry. It is intentionally applied unevenly and its purpose is to roughen the surface. Apply a layer of core plaster to this surface. Thickness can be several centimeters and serves primarily to smooth the surface. The top layer of internal plasters is a stucco that serves as a base for painting or wallpaper.

Damaged edges of plasters

Correction of render edges requires precise work. Every inaccuracy is known. Damage the damaged area to a healthy plaster. Moisten the surface so that it does not damage the surrounding plaster. Small plaster damage is enough to make plaster with sand. Mix the appropriate amount of gypsum well, and apply the trowel as quickly as possible to damage. Then flatten the surface, wipe off the surplus with a smooth bar to make the plaster level with the other wall.

Clay plasters

These are mostly internal plasters, which consist of a mixture of clay, sand, organic matter and water. Binding of clay flakes is on a physical basis, and it is important to push the layers harder and allow them to dry sufficiently.

Exterior plaster

It must withstand changes in temperature and weather conditions. Reinforcing masonry is not recommended, which is damp, as there will be large volumetric changes in the construction of the plaster. Excessive dampening of masonry occurs, for example, during torrential rains. It is also unsuitable to plaster too hot masonry during the summer months. The masonry must then be moistened before plastering.

Cement rendered homes

For outdoor two-layer plasters that are subject to weather conditions, it is recommended to apply plaster systems. The starch layer contains a high proportion of cement and a coarse grain of used sand compared to interior use.