Definition Related for Plastering Work
As below definition related for plastering work.
• Plaster Background
• Plaster Blistering
• Cracking in Plaster
• Crazing in Plaster
• Dado in Plaster
• Dubbing coat in Plaster
• Dost in Plaster
• Finishing Coat Plaster
• Flaking Plater
• Gauging in Plaster
• Grinning in Plaster
• Grounds in Plaster
• Hacking for Plaster
• Keys in Plaster
• Laitenance Plaster
• Peeling in Plater
• Under coat Plaster
It is the surface of masonry or any other surface to which we apply first coat plaster.
Due to availability id unslaked line nodules, in plaster surface, swelling develops on the surface of plaster. It is called as blistering.
Cracking in Plaster
These are cracks developed on the plastered surface due to the movement of background or structure surrounding it.
Crazing in Plaster
Hair cracks develop on the finished surface in an irregular pattern called crazing.
Dado in Plaster
Dado is a special treatment given to the lower part of wall so that the wall can with-stand erosive forces.
Dubbing coat in Plaster
Before applying plaster, the hollow spaces in solid background are filled. This process is called the dubbing coat process.
Dots in Plaster
Small projection laid on background for fixing screeds etc. are called dots. It is size may be 150 mm x 150 mm
Finishing Coat Plaster
It is the final coat of plaster. Such a coat is known as setting a coat or skimming coat.
Due to lack of adhesion with under cot. The process of scaling away patches of plaster of pervious coat takes place. It is called flaking.
Gauging in Plaster
The process of mixing various constituents of plaster is called gauging
Grinning in Plaster
It is the reflection or appearance on the surface of plaster of the pattern of joints of similar patterns in the background.
Grounds in Plaster
These are wooden strips. These strips are fixed to the background in which the primary finishing coat may be secured.
Hacking for Plaster
The process in which the surface of the background is roughened to provide a suitable key for plastering is called hacking.
Keys in Plaster
The opening or indentations or corrugation on the background or surface of under coat to from mechanical bound with plaster is called a key.
A screen consisting of particles thin layer of fine cement particles is formed due to excessive trowelling or freshly laid concrete. It is called laitance.
Peeling in Plater
This is the process of is dislodgement of plaster from the background.
Under coat Plaster
All the coats of plaster applied under the finishing coat are called under coat.
Tools For Plastering
Following tools are used for plastering:
• Floating rule
• Plumb bob
Trowels used for mixing mortar. Trowels are 150 mm to 450 mm. A few of the above are blunt-ended, and a few are point ended.
A float is used for spreading the motor on the surface of the wall. It can be of metal or wood. Wooden float is prepared by fixing the handle on a 10 mm thick wooden board. It is used to finish the coat. It is called skimming float.
Floating Rule :
It is used for checking the level of the plastered surface between successive screens.
Plumb Bob :
It is used for vertically of the plaster. Over and above this, spirit level, brush, set square, etc. are used for plastering.
Preparation of Background for Plastering
• Before applying plaster on the surface of the wall, all the masonry joints are raked out to a depth of 10 mm. in brick masonry and increase of stone masonry up to 15 mm, joints are raked out.
The racking out of joints provide the key to the plaster all dirt like dust and mortar droppings, etc. should be cleaned with a wire brush.
• All uneven surfaces are leveled before rendering is applied. The surface should be washed with clean water and kept damp uniformly.
• In case the plater is to be applied on the old surface, the surface should be cleaned. Old loose plaster should be broken surface should be washed with water, and joints should be racked out.
Methods of Plastering
• Three coat plaster
• Application of rendering coat
• Application of floating coat
• Application of finishing coat
• Two coat plaster
• Single coat plaster
• Cement Plaster and Cement Lime Plaster
• Plaster on lath
• Wooden laths
• Metal laths