Blue Metal Drainage 20mm is crushed blue metal aggregate with a typical size of 20mm. It is clean, angular, and free-draining, making it ideal for managing water flow in various applications. The 20mm size provides excellent permeability, preventing blockages and allowing water to flow freely.
Contact us for bulk rates on 10+ cubic metres.
Also available in 1.5t Bulka Bags.
Uses of Blue Metal Drainage
In domestic settings, 20mm blue metal is commonly used for:
Drainage Systems
- Placed around agricultural pipes, soak wells, and stormwater drains to improve water flow and prevent blockages.
Retaining Walls
- Used behind retaining walls to help reduce water buildup and prevent structural damage.
Driveways & Pathways
- Provides a solid, well-draining base for gravel driveways, pathways, and under paving.
Under Concrete Slabs
- Used as a drainage layer beneath concrete slabs and footings to prevent water pooling.
Garden Beds & Landscaping
- Helps with moisture control and prevents waterlogging in garden beds.
How to use Blue Metal Drainage
Prepare the Area
Excavate the required area (e.g., a trench, footing, or base).
Install Filter Fabric (Optional)
A geo-textile fabric can be placed under and around the blue metal to prevent soil contamination.
Add Blue Metal 20mm
Pour and spread a layer of blue metal to the required depth (typically 50mm–150mm, depending on application).
Level & Compact (if needed)
Use a rake to level the material, and compact it if required (e.g., for driveways or slab bases).
Cover or Leave Exposed
For hidden drainage, cover with soil, concrete, or sand.
For decorative landscaping, it can be left exposed as a feature.
Benefits of Blue Metal Drainage
Superior Drainage - Allows water to flow freely, preventing pooling and erosion.
Long-Lasting & Durable - Does not break down over time like organic materials.
Prevents Structural Damage - Reduces water pressure behind walls and under slabs.
Low Maintenance - Once installed, it requires little upkeep.
This text is designed to provide basic information, ideas and tips to support your project, it is not professional advice.
