Why is mortar between my bricks loose and how do i fix it?

For many Sydney homeowners, the charm of a brick house goes beyond aesthetics. Brick offers durability, resilience, and a timeless look. But over time, even the sturdiest brickwork can show signs of wear and tear. One common issue is loose mortar, the material that binds the bricks together. While it might not seem like a major problem initially, loose mortar can lead to water infiltration, structural issues, and even attract pests.

We understand the importance of a healthy brick facade. That\’s why we\’ve put together this comprehensive guide to help you understand why mortar loosens and how to fix it.

Why Does Mortar Loosen Between Bricks?

Several factors can contribute to loose mortar:

• Age: Like any building material, mortar deteriorates naturally over time. Exposure to harsh weather conditions like rain, wind, and extreme temperatures can accelerate this process.
• Movement in the foundation: Shifting soil or foundation problems can cause the bricks to move slightly, putting stress on the mortar joints.
• Water damage: Water is the enemy of mortar. Persistent leaks, clogged gutters, or a lack of proper flashing around windows and doors can allow water to seep into the mortar, causing it to crack and crumble.
• Poor quality mortar mix: If the original mortar mix wasn\’t proportioned correctly, it may not have been strong enough to withstand the elements. We come across this ofetn inspecting older properties (1900-1940s) when scarce ingredients led to poor quality mortar.
• Improper construction techniques: Inadequate compaction of the mortar during construction can lead to weak joints that are more prone to failure.

Signs of Loose Mortar Between Bricks

Early detection is key to preventing further damage. Here are some telltale signs of loose mortar:

• Cracked or crumbling mortar joints: This is the most obvious sign.
• Hollow sounds when tapping the bricks: If a brick sounds hollow when tapped gently with a hammer, it\’s a good indication that the mortar behind it is loose.
• Visible gaps between the bricks: Even small gaps can allow water to penetrate the wall.
• Spalling bricks: In severe cases, the mortar deterioration can cause the edges of the bricks to crumble or chip away.

Should You Fix Loose Mortar Yourself?

While small areas of loose mortar might seem like a DIY project, extensive repointing (replacing mortar) requires skill and specialised tools. Here\’s a breakdown to help you decide:

• Small patches (a few bricks): If you\’re handy and comfortable working with mortar, you can likely tackle small patches yourself.
• Larger areas or deep cracks: For larger areas of loose mortar, deep cracks, or uneven brickwork, it\’s best to call in a professional. A qualified bricklayer or restoration specialist will have the expertise and experience to ensure the job is done correctly, preventing future problems.

We Recommend Hiring a Professional for Repointing

Here\’s why we recommend professional help for most repointing jobs:

• Safety: Working on ladders at heights can be dangerous. Professionals have the proper safety equipment and training to minimise risks.
• Matching mortar: Mortar comes in different strengths and colours. A professional can ensure the new mortar matches the existing material for a seamless finish.
• Proper technique: Applying mortar correctly requires knowledge and experience. A professional bricklayer will ensure the joints are filled properly to create a strong and watertight seal.
• Tools and expertise: Professionals have access to specialised tools like tuck-pointing trowels and hawk boards, which make the job more efficient and accurate.

How to Fix Loose Mortar Between Bricks (DIY approach for small areas)

If you decide to tackle an area of loose mortar yourself, here\’s a basic guide:

Tools and Materials:

• Cold chisel and hammer
• Stiff wire brush
• Garden hose with spray nozzle (optional)
• Tuck-pointing trowel
• Mixing bucket
• Sponge
• Masonry mortar mix (appropriate for your brick type)
• Painter\’s tape (optional)

Steps:

1. Preparation: Wear safety glasses, gloves, and a dust mask. If necessary, use painter\’s tape to mask off the surrounding brickwork to prevent mortar stains.
2. Remove loose mortar: Using the cold chisel and hammer, carefully remove the loose and damaged mortar from the joints. Aim for a depth of about 1-2 cm.
3. Clean the joints: Brush away any remaining debris from the joints using the wire brush. You can also dampen the joints with a light spray from the hose to aid cleaning.
4. Mix the mortar: Following the manufacturer\’s instructions, mix a small batch of mortar in the mixing bucket. The consistency should be similar to damp putty.
5. Moisten the joints: Lightly dampen the cleaned joints with a sponge. This helps the new mortar bond better with the old.
6. Apply the mortar: Using the tuck-pointing trowel, scoop a small amount of mortar and press it firmly into the joint. Work diagonally across the joint, ensuring it\’s completely filled and compacted.
7. Tool the joint: Once the joint is filled, use the pointed edge of the trowel to create a smooth, concave finish that matches the existing mortar profile.
8. Clean Up: While the mortar is still damp, use a damp sponge to remove any excess mortar from the brick surface.
9. Curing: Allow the mortar to cure completely according to the manufacturer\’s recommendations. This typically takes several days, during which time you should avoid exposing the repaired area to rain or excessive moisture.
10. Important Considerations:
11. Weather conditions: Avoid repointing in direct sunlight, extreme heat, or rain.
12. Work in small sections: Focus on completing a small section at a time to ensure proper compaction and finishing.
13. Tool care: Clean your tools thoroughly after use to prevent mortar build-up.

While this DIY guide can help with small repairs, for extensive loose mortar or large cracks, we highly recommend contacting us. We can connect you with qualified and experienced bricklayers who can assess the damage and provide a tailored repair solution. Our network of professionals prioritises safety, use of high-quality materials, and ensures a long-lasting and aesthetically pleasing result.

Benefits of Professional Repointing:

1. Long-lasting repairs: Professionals use the correct techniques and materials to create a durable and weatherproof repair.
2. Improved curb appeal: Proper repointing restores the structural integrity and aesthetics of your brick facade.
3. Increased property value: A well-maintained brick exterior can add value to your property.
4. Peace of mind: Knowing the job is done right by qualified professionals gives you peace of mind and protects your investment.
5. Contact Us Today
6. Don\’t let loose mortar compromise the beauty and integrity of your Sydney home. If you notice signs of mortar damage, contact Local Property Inspections Sydney today. We can provide a comprehensive inspection and connect you with trusted bricklaying professionals to get the job done right.