Retaining Walls: Choosing the Right Materials and Avoiding Drainage Disasters

Retaining walls do more than just hold back soil. They prevent erosion, manage drainage, and create strong, long-lasting structures in gardens, landscapes, and construction sites. Choosing the right materials and ensuring proper drainage are critical to building a retaining wall that lasts.

Whether you are working with concrete, timber, or stone, each material has its strengths and limitations. Getting the drainage wrong can lead to costly failures, affecting the stability of the entire structure.

Here is what you need to know before starting your next project.

Choosing the Right Material for Retaining Walls

Different materials suit different applications, and selecting the best one depends on factors such as site conditions, aesthetics, durability, and budget.

Concrete Blocks: For Strength and Versatility

Concrete blocks are one of the most common choices for retaining walls due to their strength and ease of installation.

• Best for: Structural walls, tiered gardens, and heavy load-bearing applications.
• Pros: Long lifespan, high strength, and available in various finishes.
• Cons: Can be expensive and may require additional reinforcement, such as steel rebar.

Timber Sleepers: For Cost-Efficiency and a Natural Look

Timber sleepers are a popular choice for low-level walls and landscaping projects, offering a softer, more natural aesthetic.

• Best for: Low to medium-height walls, garden features, and temporary structures.
• Pros: Cost-effective, easy to install, and blends well with natural surroundings.
• Cons: Requires treatment to prevent rot, has a shorter lifespan compared to stone or concrete, and is not suitable for high-retaining walls.

Stone and Brickwork: For a Premium, Long-Lasting Option

Natural stone and brickwork provide a traditional and visually appealing solution, ideal for heritage projects and high-end landscaping.

• Best for: Decorative walls, heritage restoration, and high-end landscaping.
• Pros: Strong, durable, and visually striking.
• Cons: Labour-intensive, costly, and requires skilled installation.

The Importance of Proper Drainage

A well-built retaining wall does more than hold back soil. Without proper drainage, water buildup behind the wall can create hydrostatic pressure, leading to cracks, movement, or complete failure.

Here is how to get drainage right:

• Backfill with gravel: Use free-draining gravel behind the wall instead of compacted soil to prevent water buildup.
• Install weep holes: These allow water to escape from behind the wall, reducing pressure on the structure.
• Use drainage pipes: A perforated land drain behind the wall directs excess water away, preventing pooling and softening of the soil.
• Waterproof where necessary: For concrete and brick retaining walls, applying a waterproof membrane can help prevent water ingress and structural deterioration.

Find the Right Materials at Lords

Building a retaining wall that lasts requires the right materials, correct drainage, and a solid installation approach. At Lords, we supply a full range of concrete blocks, timber sleepers, aggregates, and drainage solutions to help you build strong, reliable retaining walls.

Visit your local branch or browse our selection online today. Our team is on hand to offer expert advice and help you choose the right products for your project.