Permeable Aggregates: What to Know for Courtyards

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Permeable aggregates let rainwater drain naturally through your courtyard surface, reducing puddles and helping maintain a safer, more attractive outdoor area. Here’s how they work and what to consider when selecting materials for your project.

Why Permeable Aggregates Are Useful

Traditional hard surfaces can lead to water pooling, creating slip hazards and contributing to local flooding. Permeable aggregates such as pre-washed pebbles are specially chosen so water passes through the gaps between them, flowing into the ground rather than running off. This approach is ideal for British weather and helps keep courtyards drier and usable year-round.

Selecting the Right Materials and Application Tips

When planning a permeable courtyard, opt for aggregates that are naturally rounded or angular, washed, and dried to prevent bonding issues. Washed Pebbles for Permeable Floors are a popular choice—especially when paired with a specialised polyurethane or epoxy binder to form stable, weather-resistant surfaces. Kits like “Flowstone” combine aggregates and resin and are designed for straightforward installation, with step-by-step instructions and guidance on selecting the right binder for your stone colour.

• Always ensure your aggregates are clean and dry.
• Use the correct resin dosage for even coverage and durability.
• Avoid application in extreme temperatures or on wet substrates for best results.

When Permeable Aggregates Matter

Consider permeable solutions if your courtyard suffers from poor drainage, is subject to frequent rainfall, or you want to reduce maintenance. These surfaces are also recommended for areas prone to frost, as better drainage can help reduce surface cracking and algae growth.

Related products

• Washed Pebbles for Permeable Floors 25kg – Outdoor Resin-Bound Surfaces
• "Flowstone" – Complete Permeable Floor Kit with Pebbles and Resin
• "Polirock" – Polyurethane Binder for White Stones, 2kg Two-Component Kit

Related guides

• What Aggregate Should I Buy For Courtyards

Choosing permeable aggregates helps create beautiful, practical courtyards that cope well in the UK climate. For more guidance on which aggregate best fits your project, see our main guide on what aggregate to buy for courtyards.