Pre-Curing and Post-Curing are necessary for cement sand plaster. For underside of the RCC ceiling/ roof, thickness of plaster is generally 10 to 12 mm. Shrinkage crack free surfaces - smooth finish 3. The setting not only involves the physical changes but is also a physico-mechanical phenomenon. While in case of cement plaster, thickness of plaster varies between 12mm to 20mm. 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. Gypsum plaster requires no curing which saves up on all that water. Cement plaster can be used in exterior and interior surfaces. Gypsum plaster is more expensive than cement sand plaster but cost disadvantages should be weighed against the advantages and the fact that the labor cost is appreciably greater than that of materials in plastering. Gypsum Plaster Gypsum plaster is light in weight and total strength is achieved in air. United States Gypsum (USG) Company is the largest sup-plier to the ceramics industry. gypsum, lime, and portland cement. The Thickness of cement plaster may vary and it depends on the surfaces to be covered and its plumb and texture. Whereas is gypsum plaster is a green building product. Thickness of gypsum plaster vs cement plaster. Performance – Durability, light weight (Reduces dead load on structure) 5. Gypsum plaster has low thermal conductivity and good thermal properties and ensures energy and power saving. Gypsum plaster cannot be used for outside walls since they retain dampness. In the case of cement plaster pre-curing and post-curing is required. 1. Please, don’t forget to share it. Â. In the event of a fire, it acts as a barrier and will protect the blockwork, concrete and steel. sand cement plastering & POP punning. The key difference between gypsum and plaster of Paris is that the Gypsum contains calcium sulfate dihydrate whereas the plaster of Paris contains calcium sulfate hemihydrates. Cement plaster is not considered as save from fungus malts et cetera. Gypsum plaster is light in weight and total strength is achieved in air. DISCLAIMER: National Gypsum Company Guide Specifications have been written as an aid to the professionally qualified specifier and design professional. Minimum Twenty-four-hour interval between coats of interior Portland cement plaster. Skim coating is a name for a plastering technique. Rendering is used to coat exterior surfaces of buildings and contains a higher percentage of cement within its composition. It is ready to use and does not need sand. She can be reached on LinkedIn, Twitter. Gypsum is non-combustible and contains a high content of crystal water. Gypsum plaster can be applied on smooth as well as a rough surface. Gypsum plaster can prevent shrinkage because it has high tensile and flexural strength. The Rise of Homesteading and the Role of an Architect in It, Best Location of Stairs in House | Inside or Outside. Plastering is an ancient building technique to cover the exposed surface and give protective surface against penetration of rain water, other atmospheric agencies like vermin and improves the appearance of the structure and gives decorative effects. 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. In gypsum plaster, gypsum is used as a binding material instead of Portland cement. Setting time of gypsum plaster can be controlled. 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