In this article we are going to cover what is plastering? Types of plastering and Gypsum vs Cement plaster What is Plastering? Plastering is a construction technique used to create a smooth, even, and durable finish on walls, ceilings, and other surfaces. It involves the application of a thin layer of plaster material onto a substrate, typically made of masonry, concrete, or wood. Plastering serves several purposes, including: Surface Preparation: Before plastering, the substrate is prepared by ensuring it is clean, free of dust, and properly primed. Any cracks or imperfections may be repaired or filled to create a smooth base for the plaster. Application of Plaster: Plaster is mixed with water to form a workable paste, which is then applied to the prepared surface using various techniques such as troweling, spraying, or throwing. The plaster is spread evenly and smoothed out to achieve the desired finish. Creating a Smooth Finish: The plaster is worked and smoothed to eliminate any bumps, ridges, or imperfections. Depending on the desired result, multiple layers of plaster may be applied and smoothed out to achieve a flawless surface. Decoration: Plastering can also involve decorative elements such as ornamental moldings, textures, or patterns. These decorative features can enhance the aesthetic appeal of the surface and add architectural interest to a space. Protection and Durability: Plastering provides a protective coating that helps to shield the underlying structure from moisture, weathering, and wear and tear. It adds strength and durability to walls and ceilings, prolonging their lifespan. Insulation and Soundproofing: Some types of plaster contain insulating materials or additives that improve thermal and sound insulation properties, enhancing the comfort and acoustics of a building. Types of Plastering In Construction Cement Plastering: Cement plastering involves the application of a mixture of cement, sand, and water to the surfaces of walls or ceilings. It provides a durable and strong finish, suitable for both interior and exterior surfaces. Cement plastering is commonly used in construction for its versatility and resistance to weathering. Gypsum Plastering: Gypsum plastering, also known as plaster of Paris (POP), involves the application of gypsum-based plaster to surfaces. It provides a smooth and fine finish, making it ideal for interior walls and decorative purposes. Gypsum plastering offers excellent fire resistance and is easy to work with due to its fast setting time. Lime Plastering: Lime plastering utilizes lime as the primary binding material mixed with sand and water. It provides a breathable finish suitable for historic or heritage buildings, allowing moisture to escape from the walls. Lime plastering offers flexibility and can be used on various substrates, including masonry, cob, and timber. Clay Plastering: Clay plastering involves the application of clay-based plaster on walls or ceilings. It provides a natural and breathable finish, suitable for eco-friendly and sustainable construction. Clay plastering regulates indoor humidity, absorbs odors, and offers thermal insulation properties. Exterior Plastering: Exterior plastering, also known as rendering, involves applying a protective layer of plaster on the exterior surfaces of buildings. It helps to waterproof and weatherproof the structure while enhancing its appearance. Exterior plastering can be done using cement-based, lime-based, or acrylic-based materials, depending on the requirements and climate conditions. Roughcast Plastering: Roughcast plastering is a textured finish applied to exterior walls to provide a rustic appearance. It involves throwing or spraying a mixture of cement, sand, and small stones onto the surface, followed by a trowel finish. Roughcast plastering offers good durability and weather resistance, making it suitable for traditional and contemporary architectural styles. Gypsum vs Cement plaster Parameter Gypsum Plaster Cement Plaster Water Curing No need to have curing for gypsum Must for 4 days Setting Time 4 hours 36 hours Ready for Primer 72 hours 360 hours Surface Finish Putty Finish Rough Finish Compressive Load Strength 98,400 N 72,400 N Density 1,333 kg/cu.m 2,222 kg/cu.m Fire Heat Sound Insulation Yes No Raw Material Gypsum powder commonly with hardeners Cement + sand (Site mixed) · Cement + sand (Packaged) Additional Materials Alkali sulfate, alum, borax N/A Color Pure white Grey Factory-made gypsum plaster is factory made No Curing Air curing for 24 hours and ready to paint after 72 hours Wet curing for 7 days and drying plaster for at least 3 days Application Areas Internal Internal and External Minimum Thickness 6 mm 10 mm Final Finish Smooth Rough Ease of Use Very easy Not so easy Per Square Feet Cost High Low Recyclable Yes No Thermal Conductivity Low High Fire Resistance High Low Rust Inhibitor Yes No Sustainability Yes No Environmental Impact Low High Installation Time Short Long Standard Packaging Size 25 kg 40 kg Compressive Strength 3.5 to 7.5 MPa (depending on ratio) 5 – 7 MPa Cost Per 100 Sq ft Rs. 2,300/- Rs. 2000 to 2600/- Additional Punning for Smooth Surface Rs. 2,300 May require POP Punning (6-8 mm) on it Finish Smooth finish and Ready to receive paint Depend on quality of sand Cost of Gypsum Plaster and Cement plaster Per sq ft Cost of Gypsum plastering in India is ₹23 per sq ft Square Footage Gypsum Plaster Cost (Rs.) Cement Plaster Cost Range (Rs.) 100 Sq ft Rs. 2,300/- Rs. 2000 to 2600/- 200 Sq ft Rs. 4,600/- Rs. 4000 to 5200/- 300 Sq ft Rs. 6,900/- Rs. 6000 to 7800/- 400 Sq ft Rs. 9,200/- Rs. 8000 to 10400/- 500 Sq ft Rs. 11,500/- Rs. 10000 to 13000/- 1000 Sq ft Rs. 23,000/- Rs. 20000 to 26000/- Wall Plaster labor Cost with material cost Description Rate Per sq.ft 1000 sq.ft 2000 sq.ft 3000 sq.ft 4000 sq.ft 5000 sq.ft Wall Plaster Labor cost Rs.23-25/- Rs.25,000 Rs.50,000 Rs.75,000 Rs.1,00,000 Rs.1,25,000 plastering Material Cost (M-Sand, Cement) Rs.30-35/- Rs.35,000 Rs.70,000 Rs.1,05,000 Rs.1,40,000 Rs.1,75,000 Total Cost of Wall Plaster with material Rs.55-60/- Rs.60,000* Rs.1,20,000* Rs.1,80,000* Rs.2,40,000* Rs.3,00,000* Plastering Surfaces and walls: Brick or Block Walls with Rough and Solid Surfaces: These surfaces provide mechanical adhesion for the plaster. Mechanical keys are formed when wet undercoat plaster dries, creating a bond between the plaster and the surface. Plaster keys help limit
