Correct way to Point Heritage Bricks

Chris BourneA Step-by-Step Guide: Correct Way to Point Heritage Bricks:

Pointing is a crucial process in brickwork, particularly when it comes to heritage bricks. The correct pointing technique not only enhances the aesthetic appeal of a building but also protects it from water ingress and structural damage. Poorly executed pointing can lead to long-term problems, including deterioration of bricks and mortar. In this guide, we will explore the correct way to point heritage bricks to ensure both durability and historical authenticity.

Understanding the Importance of Proper Pointing

Heritage bricks, often found in period properties and conservation areas, require special care during restoration. The pointing material and technique used must be appropriate for the age and composition of the original brickwork. Using modern cement-based mortar instead of traditional lime mortar, for example, can lead to issues such as moisture retention and cracking.

Tools and Materials You’ll Need:

• Lime mortar (NHL 3.5 or NHL 2 for softer bricks)

• Pointing trowel

• Hawk board

• Soft brush

• Bucket and sponge

• Jointing tool (e.g., Frenchman or chariot wheel)

• Chisel and hammer (for removing old mortar)

• Personal protective equipment (gloves, safety goggles, dust mask)

Step-by-Step Guide to Pointing Heritage Bricks

1. Assess and Prepare the Brickwork

Before starting, inspect the existing mortar joints. If the mortar is loose or crumbling, it needs to be replaced. Using a chisel and hammer, carefully rake out the old mortar to a depth of at least 20mm. Be cautious not to damage the edges of the bricks in the process.

2. Clean the Joints

Once the old mortar is removed, brush away any loose debris using a soft brush. Dampen the joints with water to prevent the bricks from absorbing moisture from the fresh mortar too quickly. This helps the new mortar adhere properly and cure at the right pace.

3. Prepare the Lime Mortar

Lime mortar is the preferred choice for heritage bricks because it is more breathable and flexible than cement-based alternatives. Mix the lime mortar according to the manufacturer’s instructions, ensuring a workable yet firm consistency. Let the mortar sit for a few minutes before application to allow the lime to absorb water properly.

4. Apply the Mortar

Using a pointing trowel, load the mortar onto a hawk board and then press it into the joints firmly. Work in small sections to ensure precision. The mortar should be packed tightly to avoid air pockets and ensure durability.

5. Finish the Joints

The joint profile should match the original style of the building. Traditional pointing styles include:

• Flush pointing – where the mortar is level with the brick face.

• Recessed pointing – where the mortar is slightly set back, often used to enhance brick detailing.

• Weather-struck pointing – where the top edge of the joint is slightly sloped to shed water.

Use a jointing tool to smooth and shape the mortar, ensuring a consistent finish. Avoid overworking the joints, as this can weaken the bond.

6. Curing and Finishing Touches

Lime mortar requires slow curing to achieve maximum strength. Protect the newly pointed brickwork from extreme weather conditions (rain, direct sun, or frost) by covering it with hessian or damp cloths for at least three days. Mist the joints with water periodically to aid in the curing process.

Once the mortar has partially set but is still workable, use a soft brush to remove any excess mortar from the brick faces, taking care not to disturb the joints.

Common Mistakes to Avoid

• Using cement-based mortar: This can trap moisture, leading to brick spalling.

• Not raking out enough old mortar: A shallow joint will not provide a strong bond.

• Allowing the mortar to dry too quickly: Rapid drying can cause cracking and weak joints.

• Overworking the mortar: Too much manipulation can weaken the structure and affect appearance.

Final Thoughts

Correctly pointing heritage bricks is a skill that requires patience and attention to detail. By using the appropriate materials and techniques, you can preserve the integrity and character of historic brickwork while ensuring its long-term durability. If you’re unsure about tackling the job yourself, consider consulting a specialist in heritage brick restoration to achieve the best results.

For more advice on heritage brickwork and traditional building techniques, explore our range of products and expert guides at Heritage Brick Company.

For more information on Correct way to Point Heritage Bricks talk to Heritage Brick Company