What is Pointing in Brickwork? Method and Types of Pointing
What is Pointing? & Types of Pointing
The joints on the face of stonework or brickwork are unevenly filled in, while the wall is being constructed. These unfinished joints need to be filled and finished properly. Pointing is a method of repairing these mortar joints to improve the appearance of the brick or stone masonry and to protect it from weathering actions. Types of pointing describe in below.
Generally, pointing is done with following two types mixes:
- Lime Mortar (1:2, 1 part of lime and 2 parts of Sand)
- Cement Mortar (1:4, 1 part of cement and 4 parts of sand)
When Pointing is Done?
It’s totally adopted in the situations.
- Where it is not required to produce a smooth and even surface.
- Where the surface appearance is exhibited by the pattern, thickness, colors and texture of joints.
- Where the natural beauty of materials stone, blocks & bricks, etc. is desired to be exhibited in the walls.
- Where good quality materials like stone blocks, are used in construction which can withstand the adverse effects of weather. Under such conditions, pointing being, an economical alternative, is recommended.
- Where the workmanship is of good quality and joints can be finished smooth with richer mortar mix.
Method of Pointing:
- Before starting the pointing work, joints are raked down up to a depth of 15mm using chisel or any other tools.
- Loose material is then removed, space is cleaned with water and left wet for some time.
- Joints are then filled with suitable material using a trowel by forcing it into the joints.
- Excess mortar is removed and surface is finished.
Types of Pointing:
The joints of pointed work are finished in various shapes. This finishing of pointing work into different types is described below.
Cut Weathered/ Struck Pointing:
Struck or Cut weathered pointing is done by keeping the face of the pointing sloping outwards, instead of vertical. This is obtained by filling in the raked joints and pressing the finished face inside by 3 to 6 mm with a suitable pointing tool.
Flush pointing is obtained by forcing mortar into the joints and removing the excess mortar. The joint is flushed or even out with the face. Flush pointing does not have good appearance but it is the most durable, simplest and commonly used method because it does not leave any space for dirt.
V- Grooved Pointing:
Vee pointing is achieved by filling in the joints, flushing them with the face and forming a V shaped groove or by projecting V shaped pointing in the joints.
Rubbed or Keyed Pointing:
This type of pointing is also known as Keyed Pointing. This pointing is modified form of flushed pointing, in which joints are first flushed with face and a groove is formed in the freshly applied mortar. This type is widely used and gives better appearance and better grip for plaster work.
In recessed pointing, the mortar is filled in the joints and pushed back to 5mm or more using appropriate tools. The face is kept vertical for this pointing. This type of pointing is mostly used for good facing work using high quality mortar
Tuck pointing is achieved by filling in the joints, flushing them with the face and forming a rectangular groove at the centre of the joint. The width and depth of a groove are kept 5 mm and 3 mm respectively. This groove is then filled up with white lime putty and silver sand in small amount, leaving a small projection of 3 mm. If this projection is not made in the mortar, it is called bastard pointing or half – tuck pointing.
Beaded pointing is formed at the centre of joints using a steel or iron rod with a concave shaped edge. This type of pointing is attractive in appearance but it is problematic to sustain as it can be easily damaged.