There are many similarities between the two, so this subject can be quite confusing. So, in this article, the team at Zaks Render will help you understand the differences between cement render and plaster. This is the key difference. Interiors are usually finished using plaster, while exteriors use cement render. While the basic composition of both render and plaster are fairly similar — a combination of water, sand and cement — sometimes, the actual products are quite dissimilar.
Finer sand is used to achieve smooth surfaces in internal plastering, and usually less sand is used overall. Cement rendering involves a much higher proportion of sand for additional strength. The cement plaster consists of one part of cement to four parts of clean, coarse, and angular river sand by volume the materials are thoroughly mixed in a dry condition before water is added to them. The mixing of materials is done, or a watertight platform and plaster of one cement bag only are prepared at a time, and this quantity of plaster is consumed within 30 minutes after adding water.
Gypsum plaster , white cementing material made by partial or complete dehydration of the mineral gypsum , commonly with special retarders or hardeners added. Applied in a plastic state with water , it sets and hardens by chemical recombination of the gypsum with water. It is widely used as a fertilized, in mould, in sculptures, and as plaster material.
Gypsum composed of crystallized calcium sulfate CaSO4 is added to Portland cement to regulate the extreme setting reaction which occurs in the presence of water. The gypsum content of cement is expressed in terms of its sulphate SO3 content. Cement plaster can be used on exterior and interior surfaces.
Whereas gypsum plaster can only be used on the ceiling and interior walls it cannot be used in wet areas like toilet bath kitchen wash area balconies etc. Whereas gypsum plaster gives a very smooth finish which makes it compatible with paints. The application of gypsum plaster is a time-saving process thus decreases the project cost.
Nowadays river sand availability is a major problem and rivers and has become costly hence cement plaster is costlier than gypsum plaster. Gypsum plaster is cheaper as compared to cement plaster. In gypsum plaster , readymade POP powder is mixed with water and applied directly to the wall. Gypsum Plaster can be applied directly on any brick, solid or hollow blocks, AAC blocks and plaster boards.
Gypsum plaster has good insulation properties, fire-resistant and impact resistant. Like this post? Share it with your friends! Hey, I am Krunal Rajput. The Man Behind CivilJungle. I started this site to spread knowledge about Civil Engineering.
I am a Degree Holder in Civil Engineering. Your email address will not be published. Gypsum Plaster Cement Plaster 1 Whereas gypsum plaster can only be used on interior rooms it cannot be used in wet areas like toilet bath kitchen wash area balconies etc.
Cement plaster can be used for plastering both the external walls and the internal walls and ceilings of the building. So there are fewer Shrinkage cracks in gypsum plaster as compared to traditional cement plaster. Cement plaster is made up of sand Portland cement and water.
Gypsum is a lightweight material which is formed as a result of evaporating seawater in Massive prehistoric basins. Difference between cement plaster and gypsum plaster is as follows:. Rate Analysis For Gypsum Plaster. Difference Between Plastering And Pointing. Calculation of Material Required For Brickwork. Save my name, email, and website in this browser for the next time I comment.
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