All About Cement Rendering And Plastering Process

By Author: Jim Lee
Total Articles: 332
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There is two fold advantage to the process of rendering. One is basically weather proofing of a building and their walls and the second is to provide an appeasing appearance to different textures. The process is known as plastering, and is one of the skilled trades that need the hands of the professional plasterer. Their expertise grows with experience, and they are well aware of the nuances and elementary principles of the entire process. However, if skilled professionals are not available, the hired experts should know the elements, the principles involved in the process. They should also know how to prepare the surface and all other details in the procedure like choosing the particular mix and the proportions of the materials used as a plaster.
The ratio of lime, cement and sand depends on the purpose of the plaster that is to be used. The second factor that determines the ratio is the nature of the building surface on which it will be applied. The pure lime variety of the mixture is very soft, weak and slow setting in nature. The mixture is further gauged with cement to further increase the strength and hardness. ...
... Adding the last material also shortens the time for the hardening process. The increase of strength and decrease of time depends on the amount cement mixed to the lime mixture. However, adding the previous component makes it less pliable and more difficult to apply. The sand added does not exceed more than three times the entire mixture. Since this becomes a fairly strong amalgamation, it is advisable not to be applied in porous backgrounds or on an weak first coat.


For the plastering on the external walls of a building, or on dense materials like concrete, concrete blocks, the best ratio that can be used is one part of cement, six parts of sand by volume, and one part of hydrated lime. If the building walls are more exposed to rain and other rough weather, the amount of cement is to be increased to make the mixture more workable in nature. When doing this job, that is cement rendering, it is important to be aware of the nuances of the proportion so that the mixture is more pliable and useful.


If the external walls of the building are weaker and have increased porosity with less breezy concrete blocks, the pasting mixture should be the same as the above mixture. It is important to remember that the mix should have very little of no lime at all.


In the case of internal walls, the suitable ration to be used is one cement, one lime and six amount of sand. The sand can be increased to nine, or the lime mix be changed into one is to three. It is important to remember the nature of cement. It only increases the hardness but decreases the time of hardening. In the case of binding the fish ponds, only the cement variety mix should be used and sprayed with the help of mortar sprayers.


The outside weather greatly influences finished product. When pasting on the external walls, it is important that it be started on the shady areas before. No kind of rendering should be carried in frosty weather. It is also important to remember that in cold weather plaster hardens very slowly, and therefore the time between each coat be increased.