Pointing is the art of ending the matter joints within the exposed masonry with an acceptable cement or lime mortar, to protect the joints from weather effects, to enhance the appearance of building structure.
The joints on the face of any masonry are roughly filled, whereas the wall is being raised.
Pointing is done with the following mortar mixes:
Lime mortar 1: 2 mix (1 lime: 2 sand)
Cement mortar 1: 3 mix (1 cement: 3 sand)
Method of Pointing:
All the mortar joints in the masonry are raked out to a depth of 10-15mm with the help of pointings tool.
Dust and loose mortar are thoroughly cleaned.
The joints and the surface are washed with clean water and kept wet for sometimes.
The mortar is taken in a small pan and the old mortar is pressed into the joints and filled with small trowels to make close contact with the joints.
Joints are discarded- flushed, sunk, or raised depending on requirements, removing excess mortar.
The finished work is cured for 3-4 days in cases of lime mortar and for 10 days when cement mortar is used.
Types of Pointing:
Pointing is classified in the shape of finishing.
The type of pointings is decision-based on the type of masonry, the nature of the building structure and the desired effect of finish.
This type of pointings gives a very good appearance but is difficult to maintain.
The raked joints are filled with a mortar and finished flush with the face of the property after which beaded by a steel highway with a concave edge in between the joints.
In any pointings, joints are raked and they are completed flush with the face of the brick masonry.
The sides are correctly trimmed. It is the easiest type of pointings, which is extensively used in masonry work.
This pointing does not give good look however it is extremely sturdy and it doesn’t enable dust, dirt to lodge over it.
In this type of pointings, the mortar is kept vertical but inside the surface of the wall with the help of suitable equipment.
This type of pointings is suitable to withstand the work of bricks of better texture and better quality mortar.
Rubbed or grooved pointings:
In this type of pointings, the raked joints are filled up flush with face or the wail and semicircular notches are formed by a special tool.
This type of pointings is commonly used, it improves the appearance, of the wail.
In this type, the mortar is pressed into the joints and finished flush with the face of the wall.
When the mortar is still moist, a rectangular groove is formed on the middle of the joints.
The groove is filled with white lime putty and a small amount of silver sand, projecting slightly outside the finished surface of the plaster indicating it.
This type of pointings gives an attractive appearance but the fillet part is not very durable.
In this type of pointings either ‘V’ shaped grooves are engrowed in the finished surface of the pointing plaster when it is still green or by projecting the ‘V’ shape of the pointing face outside the wall, surface.
Weathered or struck pointings:
In this type, the face of pointings is not kept vertical but it is kept inclined.
The upper edge of pointing plaster is pressed inside the masonry by about 10 mm and the lower edge is finished level with the face of the masonry.
This type of pointings is mostly used for brickwork particularly for finishing horizontal joints.
Advantages of Pointing:
- Improves the overall look of the structure.
- Reduces the need for other repair or rehabilitation work.
- Protects the walls of the structure from adverse weather.
- Improves the structural strength of the building.
Disadvantages of Pointing:
- In winter, the moist brickwork freezes, rotting and spalling bricks or stones begin to appear.
- Pointing is responsible for the terrible damage to various walls throughout the nation.
Frequently Asked Questions:
What is the purpose of pointing?
It is the technique of repairing mortar joints between bricks or other masonry elements, also to the maintenance of the building.
What is pointing in civil?
Pointing is the finishing of mortar joints in brick or stone masonry construction.
How often should Pointing be done?
The pointing should last 50–100 years.
What is the best mix for pointing?
Build 5 parts sand, 1 part cement, add plasticizer to manufacturer’s instructions.
Pointing is usually done after block work, small wooden scale or thickness of 5 mm is placed on the mortar joint and a fine line is marked at the joints to define the uniformity of the block work.