What is Pointing in Brickwork?

Pointing involves the application of a final layer of cement or lime mortar to seal and enhance the aesthetic appeal of mortar joints in brick or stone masonry. This cost-effective practice proves beneficial even in arid regions where it serves as a protective shield against the elements.

Importance Unveiled

Preventing Water Damage : Acts as a barrier to water, safeguarding against seepage and potential rot in mortar joints.

Strengthening Bonds : Provides a robust and reliable bond between bricks or stones in masonry.

Reducing Maintenance Needs : When done correctly, minimizes the frequency of routine maintenance.

Versatile Application : Can be effectively utilized in diverse settings, including dry regions.


Mortar Mix Choices

i) Cement Mortar:

  • Ingredients: Cement, sand, and water in a 1:3 ratio.
  • Usage: Suitable for both new and historic building points.

ii) Lime Mortar:

  • Ingredients: Fat lime, fine sand, and water in varying proportions (1:2 or 1:3).
  • Usage: Ideal for traditional construction methods in old and modern buildings.

Step-by-Step Pointing Process

Joint Preparation:

  • Specialized tool used to rake out mortar joints (15–20 mm).
  • Brushes remove loose mortar or dust.

Surface Cleansing:

  • Joints and wall surface cleaned with water, leaving the area damp for a few hours.

Mortar Application:

  • Appropriate mortar applied with a tiny trowel, forming a tight seal.
  • Joints can be flush, elevated, or sunk based on pointing technique.

Pinning and Maintenance:

  • Pinning can be done anytime for added durability.
  • Moisture maintenance: 3 days for lime mortar, 10 days for cement mortar.

Diverse Pointing Styles

Flush Pointing : Edges finished flush with mortar for durability.

Keyed Pointing : Similar to flush pointing, widely employed for longevity.

Recessed Pointing : Mortar pushed back, creating a visually appealing look.

Struck Pointing : Essential for rapid drainage in wet weather, forming a slope.

Beaded Pointing : Grooves created with a concave tool for aesthetic appeal.

Truck Pointing : Mortar applied and cut in the middle of the channel.

V-Grooved Pointing : Forms a V-shaped groove on the finished side.

Weathered Pointing : Mortar pressed into joints and neatly pressed back for a sloping effect.


Applications Explored

Joint Sealing : Used with cement mortar to seal joints between bricks.

Stone Masonry Enhancement: Strengthens pointing by incorporating stones.

Crack Maintenance: Repairs and maintains cracks in buildings through repointing.

Aesthetic Enhancement: Used to enhance the visual appeal of structures.


Advantages

  • Fixes broken joints, ensuring long-lasting strength.
  • Shields against environmental elements, reducing maintenance costs.
  • Enhances the aesthetic appearance of masonry structures.

Disadvantages

  • Limited application on internal walls.
  • Requires precision for a smooth and pleasing finish.
  • Possible flaws even after pointing, challenging in rainy regions.

Conclusion

In essence, pointing serves as a vital maintenance practice for buildings, ensuring the longevity and structural integrity of mortar joints in brick or stone masonry. By addressing aging joints, pointing contributes to the sustained health and aesthetic appeal of structures.