In construction, achieving a good finish on walls and other structures is essential. Two techniques that are often used for this purpose are plastering and pointing. While they may seem similar, each has a unique role and function in ensuring the structural integrity and aesthetic appeal of a building. In this blog, we’ll delve into the differences between plastering and pointing, examining their individual purposes, techniques, and how each contributes to construction projects. We’ll also discuss applicable IS codes to ensure high-quality and standardised work.
What is Plastering?
Plastering is the process of covering rough surfaces of walls, ceilings, or other structural components with a smooth layer of material. Typically, this layer is made of cement mortar, lime mortar, or gypsum, and it serves both a protective and decorative purpose. Plastering creates an even, clean surface that is not only pleasing to the eye but also protects the structure from environmental factors like moisture and dust.
Key Purposes of Plastering
- Protection: Plastering provides a protective layer against environmental factors, such as rain, wind, and dust. This is especially important for the external walls of buildings.
- Aesthetic Appeal: Plastering hides uneven surfaces, imperfections, and joint lines, providing a smooth and uniform look.
- Insulation: The plaster layer acts as an insulating layer, helping to regulate the temperature inside the building by reducing heat loss.
- Fire Resistance: Plaster can add to the fire resistance of walls, which is an important aspect for safety.
Types of Plastering
- Cement Plaster: This is the most common type of plaster, made by mixing cement with sand and water. It’s durable and often used for both interior and exterior walls.
- Lime Plaster: Made by mixing lime with sand and water, lime plaster is used where breathability is important. It’s less durable than cement plaster but allows moisture to evaporate.
- Gypsum Plaster: This plaster is easy to apply and sets quickly. It’s often used for interior walls, especially for finishing purposes, due to its smooth texture.
Plastering Process
The plastering process involves the following steps:
- Surface Preparation: The wall surface is cleaned, and any loose material is removed. A bonding agent is sometimes applied.
- Mixing: The plastering material is mixed in the correct proportions based on the type of plaster.
- Application: The plaster is applied in multiple coats, starting with a rough coat and finishing with a smooth top coat.
- Finishing: After the final coat, the surface is smoothed using a trowel or a wooden float.
Applicable IS Codes for Plastering
The relevant IS codes that ensure quality in plastering work include:
- IS 1661:1972 – Code of Practice for Application of Cement and Cement-Lime Plaster Finishes.
- IS 2402:1963 – Code of Practice for External Rendered Finishes.
These codes outline the standard procedures for plastering, including the thickness of layers, material quality, and application techniques.
What is Pointing?
Pointing, on the other hand, refers to the process of applying mortar to the visible joints of brick or stone masonry. Unlike plastering, pointing is not about covering the entire wall surface but rather enhancing the appearance of the joints. Pointing also serves to protect the masonry from water infiltration and other environmental factors.
Key Purposes of Pointing
- Aesthetic Improvement: Pointing can enhance the appearance of a wall by giving a clean, uniform look to the joints.
- Weatherproofing: By sealing the joints between bricks or stones, pointing helps prevent moisture from entering and damaging the wall.
- Strengthening: Properly applied pointing can contribute to the stability of the wall by strengthening the joints.
Types of Pointing
- Flush Pointing: Mortar is applied and then levelled flush with the masonry surface, creating a smooth look.
- Recessed Pointing: The mortar is applied below the surface level, creating a recessed effect.
- Beaded Pointing: A slightly raised, rounded bead is created along the joint, giving it a decorative appearance.
- Tuck Pointing: This is used for decorative purposes, where a fine line of white mortar is applied over the regular mortar, creating an illusion of very thin joints.
Pointing Process
The pointing process involves:
- Surface Preparation: The joints are cleaned by removing any loose material, dust, and old mortar if necessary.
- Mixing: Mortar is mixed according to the specified ratio for the type of pointing.
- Application: The mortar is applied into the joints using a pointing trowel, and the chosen finish is achieved.
- Curing: The newly applied mortar is cured to ensure it bonds well with the masonry.
Applicable IS Codes for Pointing
The relevant IS codes for pointing include:
- IS 2250:1981 – Code of Practice for Preparation and Use of Masonry Mortars.
- IS 1597 (Part 2):1992 – Code of Practice for Construction of Stone Masonry, which includes guidelines for pointing in stone masonry.
Differences Between Plastering and Pointing
| Aspect | Plastering | Pointing |
|---|---|---|
| Purpose | Covers the entire surface for protection and appearance | Applied to masonry joints to protect and enhance appearance |
| Materials Used | Cement mortar, lime, gypsum | Cement mortar, sometimes with lime |
| Application Area | Full wall or surface | Joints between bricks or stones |
| Techniques | Requires multiple coats | One-time application to joints |
| Protective Role | Provides an insulating layer for the entire wall | Protects masonry joints from water infiltration |
| Aesthetic Role | Smooth, uniform surface | Neat, visible joints with various finish styles |
Conclusion🎯
Understanding the difference between plastering and pointing is crucial for anyone involved in construction or home improvement projects. While plastering covers entire surfaces, providing protection, insulation, and a smooth finish, pointing focuses on enhancing and protecting masonry joints. Each technique serves a unique purpose and requires specific skills to ensure quality work. By adhering to the relevant IS codes, both plastering and pointing can meet high standards, ensuring durability and aesthetic appeal for years to come.