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Plastering is done on the walls to remove surface imperfections, maintain line level and alignment. In addition to that it also acts as a protective surface for external walls. Cement plaster is applied to both interior and exterior walls to give them a smooth surface.
What are the two requirements for good plastering?
Requirements In the hardened state, plaster must be: strong enough to hold paint and withstand local impact and abrasion; free of unsightly cracking; well bonded to the substrate; have an acceptable surface texture; and have acceptable surface accuracy (with reference to a plane or curved surface).
What is the quantity of plastering required?
The overall thickness of plastering should be minimum 20mm including two coats. The Volume of each cement bag = 50Kgs/1440 = 0.0348 m3.Different ratios of Cement mortar used for plastering are tabulated below: Mix Ratio Areas of usage 1:4 Used for Ceiling and external walls.
How do I calculate how much plastering I need?
Calculation of quantity of material for 12 mm thick plaster of ratio 1: 6 (1 Cement:6 Sand) in the wall for 100 Sqm Quantity of Cement = 2/(1+6) × 1 (1 Ratio of cement) In Kg = 0.30 × 1440 (Density of cement = 1440 kg/m3) Quantity of Sand = 2/(1+6) × 6 (6 Ratio of sand) In Cubic Feet = 63.558 cft (1 Cum = 35.31 cft).
What is difference between plastering and pointing?
Instead of plastering the entire surface of the masonry, special mortar finishing work is done to the exposed joints. This is called pointing. It consists of raking the joints to a depth of 10 mm to 20 mm and filling it with richer mortar mixes.
What is the mix ratio for plastering?
Plaster Mix Ratio Mix cement and sand in the ratio of 1:6 (1 cement:6 sand) for inner plastering of bricks. And for outer plastering mix it in the ratio of 1:4. On a brick wall never do plastering of thickness more than 12 or 15mm.
How much is plastering per square meter?
Approximately £40 – £60 per M2 (including labour and materials). The cost will vary depending on the type of base coat needed.
What are the requirements for plastering?
21.1 REQUIREMENTS OF GOOD PLASTER It should adhere to the background and should remain adhered during all climatic changes. It should be cheap and economical. It should be hard and durable. It should be possible to apply it during all weather conditions.
What are the three coats of plastering?
In the 3- coat plaster, the first coat is known as rendering coat second coat known as floating coat and the third coat is known as setting coat or finishing coat. The first coat is known as rendering coat. The Second coat is known as floating coat. The third coat is known as setting coat or finishing coat.
How do you make plaster stronger?
Step 1: Prepare the Work Area. Cover you work area with a layer of newsprint to prevent the plaster from sticking to important surfaces. Step 2: Mix Water and Glue. Place 1 1/4-cup water in a plastic mixing bowl. Step 3: Add the Plaster. Slowly pour 2 cups of plaster of Paris into the water. Step 4: Rest and Mix.
What is the difference between rendering and plastering?
The basic difference between plastering and rendering is; plastering is carried out on interior surfaces while rendering is undertaken on exterior surfaces. More specifically, the difference between plastering and rendering concerns the combination and type of materials used.
What are the two objective of plastering?
Plastering conceals defective workmen ship and covers up unsound and cheap quality material. Plastering on external walls is done with the object of improving the resistance of the surface to rain water penetration and other atmospheric influences. Plastering protects surfaces against vermin.
How do you fix bad plastering?
Repairing holes and crumbled plaster requires removing the damage and patching empty spaces. Scrape or brush off loose plaster to reveal the lath underneath. Drywall makes a suitable patch for the resulting bare spot, and drywall screws fasten it to the lath. Masking the repair is the same as with a drywall repair.
What is the process of plastering?
Preparation of Surface for Plastering Keep all the mortar joints of wall rough, so as to give a good bonding to hold plaster. Roughen the entire wall to be plastered. Clean all the joints and surfaces of the wall with a wire brush, there should be no oil or grease etc. left on wall surface.
Why is plaster used for walls?
Plaster is a building material used for coating, protecting and decorating internal walls and ceilings. It can also be used to create architectural mouldings such as ceiling roses, cornices, corbels, and so on. The most common types of plaster are a composition of gypsum, lime or cement with water and sand.
What is plaster thickness?
The recommended thickness of cement plastering is given below. Recommended thickness of plastering for brick walls is 12 MM, 15 MM or 20 MM. 12 MM thick cement plaster is done where the plain surface of brick masonry is plastered. 15 MM cement plaster is required on the rough side of 9” and 4.5” wall.
What are the types of plastering?
5 Main Types of Plaster for Walls | Buildings Type # 1. Special Plasters: Type # 2. Stucco Plaster: Type # 3. Waterproof Plaster: Type # 4. Lime Plaster: Type # 5. Composite Plaster:.
What are the methods of plastering?
Methods Of Plastering Application of rendering coat. Application of floating coat. Application of finishing.
What are the three main plaster defects?
Today we will walk you through several common plaster defects and their primary causes & prevention. Blistering of Plastered Surface. Plaster De-bonding. Cracks on Plastered Surface. Efflorescence on Plastered Surface. Falling Out of Plaster. Popping of Plaster. Loose Plaster.
Why is plastering needed?
However, as a surface material for interior walls and ceilings and to a lesser degree for exterior walls, plaster remains in common use. It facilitates cleanliness and sanitation in building and is a retardant to the spread of fire.
Which is best cement for plastering?
Best cement for plastering:- Best cement for plastering used in construction is OPC- 43 (Ordinary Portland cement grade 53) and PSC (Portland slag cement) brand of UltraTech Cement, ACC gold water shield, ACC Suraksha power, Ambuja Cement, Sagar cement, Dalmia Cement, Shri cement, Birla cement, etc.
What are the defects in plastering?
9 Types of Defects Observed in Plastering Blistering of Plastered Surface. Cracks in Plastering. Efflorescence on Plastered Surface. Flaking. Peeling. Popping. Uneven Plaster Surface. Softness of the Plaster.
