When it comes to paving, most of us focus on the surface: the colour, shape, and style of pavers that will define our driveways, walkways, or patios. Yet, what’s happening beneath the surface is just as critical to your project’s success. A solid foundation, known as the sub-base, is the hidden hero that ensures your paved area stands the test of time, no matter the traffic or climate conditions.

At N1 Paving, we’re committed not just to selling high-quality pavers, but also to helping you understand how best to install them for maximum durability. Below, we explain why sub-base preparation matters and how to get it right.

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Why the sub-base matters

The sub-base layer is the load-bearing foundation underneath your paving bricks. A well-constructed sub-base provides:

• Stability and strength: It prevents shifting, sinking, and cracking by distributing weight evenly.
• Enhanced drainage: Properly prepared and compacted layers help water drain away, reducing the risk of standing water that can damage both pavers and surrounding structures.
• Longevity: With a stable sub-base, your paved surface stays level and crack-free for longer, saving you from premature repairs or replacement.
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Key components of a good sub-base
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Excavation

• Determine the required depth by factoring in your paver thickness (e.g., 50mm or 80mm) plus the depth of the sub-base layer (often 100mm to 150mm for residential projects, or more for commercial/industrial).
• Ensure the excavation is consistent concerning depth and free from soft spots or large rocks that could compromise stability.

Compaction

• Even the best materials need proper compaction to eliminate air pockets.
• Use a vibrating plate compactor or roller in several passes, checking each layer for uniform density.
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Bedding sand

• A thin layer of bedding sand (about 20-30mm) sits atop the compacted base.
• This creates a smooth, level plane for the pavers, allowing them to ‘lock in’ correctly once installed.

Steps to ensure a durable base

1. Assess the soil: If your soil is clay-heavy or has drainage issues, you may need additional reinforcement or geotextiles to prevent shifting.
2. Set proper levels and slopes: Slightly angle your surface to direct water away from foundations or walkways, preventing pooling.
3. Test for evenness: After each compaction pass, check with a level or laser line to ensure no dips or humps.
4. Plan for traffic: Heavy-load areas (like driveways or truck entrances) need thicker sub-bases, higher-strength pavers (e.g., 80mm), or even 40 MPa pavers if required.
   

Common mistakes to avoid

• Skipping or skimping on compaction: A poorly compacted sub-base leads to uneven settling and eventual cracks.
• Using unsuitable aggregate: Mud, clay, or ungraded fill can’t provide the same structural integrity as proper crushed stone or gravel.
• Ignoring drainage: Standing water weakens the sub-base and can lead to cracks in the surface.
  

How N1 Paving supports your success

• Expert guidance: From DIY enthusiasts to professional installers, we’re here to answer questions and ensure you select the right paver and sub-base specification for your project.
• High-quality products: Our range includes pavers designed for residential, commercial, and industrial applications — all tested in our in-house lab and compliant with SANS 1058:2012 standards.
• Long-term value: By emphasising correct sub-base preparation alongside premium pavers, we help you save on costly repairs down the line.

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Ready to lay a strong foundation?

Whether you’re upgrading a driveway, creating a new patio, or working on a commercial project, investing in proper sub-base preparation is key to ensuring your paved surface remains durable, level, and visually appealing.

Contact our team at N1 Paving for advice or to explore our wide range of paving solutions,

We’re always here to help you create strong, enduring spaces — from the ground up.

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