The application of cement plaster is time-consuming process hence increases the project cost.Percentage of wastage is higher during application.After a 48-hours period finished coat plaster may be applied to interior cement base coats. of interval between coats of interior Portland cement plaster. Cement plaster is comparative gives a rough finish.Density of cement plaster is higher than gypsum plaster hence the load on the building is increased as compared to gypsum plaster and needs water to attain strength.Development of shrinkage cracks is quite frequent in cement plaster.The space looks smaller and unattractive as it is dark grey in color.After sand cement plaster, POP punning is required for the better and leveled surface finish.The mixture of the sand and cement is to be done on site in different ratios.Cement plaster is not a rust inhibitor.It cannot be applied on the smooth surface.It has more or less same acoustics properties.
Cement plaster up to 200 to 300 C acts as refractory material and resists fire but later it becomes brittle and cracks and falls and loses bond with wall.The site becomes dirty due to it and also needs more time for works. Cement plaster needs an enormous amount of water during its curing period.Pre-Curing and Post-Curing are necessary for cement sand plaster.In the bathroom or in the kitchen it will lead to the formation of condensation on the walls and as consequences mould, fungi will develop and also floor will become slippery due to moisture. Cement plaster is not 100 % permeable to water vapor.Most of cracking happens due to shrinkage, which is quite common. Cement plaster is basically weak in tension and flexural strength and hence prone to cracking.It has more or less same thermal conductivity as gypsum.The Thickness of cement plaster may vary and it depends on the surfaces to be covered and its plumb and texture. The thickness of cement plaster should not be less than 10 mm.It is used on both internal as well as external surfaces.The sand and cement are mixed at the site in different ratios. Cement plaster is a homogeneous mixture of Portland cement and sand with water.Plastering is associate ancient building technique to cover the exposed surface and provides protecting surface against penetration of rain, alternative atmospheric agencies like vermin and improves the looks of the structure and provides decorative effects.
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