Pea Shingles 20mm (Gravels)

Pea Shingles 20mm is a natural gravel made up of rounded to sub-rounded stones. It is screened to a nominal 20mm grading, typically within a 10–20mm size range depending on source.

The rounded particle shape allows the material to settle into a stable but flexible layer. Natural voids between stones support free water movement and reduce surface water retention.

It is used across domestic, commercial, and light civil works. Typical uses include drainage layers, landscaping, soakaways, and surface finishes where smooth texture and permeability are required.

Drainage Function and Material Context

Rounded gravel aggregates are used where water movement and surface comfort are prioritised. They do not interlock tightly like crushed stone but allow consistent drainage through the layer.

Pea Shingles 20mm is selected where rapid water dispersal is required beneath or around structures. The larger particle size increases void space compared to finer shingle.

Material selection depends on drainage design, surface exposure, and whether structural restraint is required.

Grading and Material Classification

This product is supplied as a natural rounded gravel aggregate. The grading focuses on permeability rather than dense compaction. It is suitable for drainage and surface cover applications.

• Nominal 20mm rounded grading.

• Washed material with low fines content.

• Natural stone composition with mixed colour tones.

Compaction and Structural Behaviour

Pea Shingles 20mm does not compact into a bound layer. It settles under placement to form a stable surface when confined. The rounded particles allow limited movement without structural failure.

• Rounded stones limit mechanical interlock.

• Suitable for confined or restrained areas.

• Not designed for load-bearing layers.

Drainage and Water Interaction

The aggregate allows rapid water movement through large inter-particle voids. This supports drainage performance in exposed and subsurface applications. Permeability remains consistent when protected from fines ingress.

• High void ratio supports free drainage.

• Reduces surface water pooling.

• Suitable for soakaways and drainage surrounds.

How It Compares to Other Small Aggregates

Pea Shingles 20mm differs from crushed aggregates due to its rounded shape. This provides smoother surface texture and higher permeability. Crushed stone offers greater interlock and compaction but reduced surface comfort. Pea shingle is selected where drainage and appearance are prioritised over structural restraint.

• Rounded particles improve surface comfort.

• Larger size increases drainage capacity.

• Crushed aggregates prioritise stability over permeability.

Suitability and Usage Limitations

Suitable For

• Drainage layers and soakaways.

• Landscaping and decorative ground cover.

• Perimeter and foundation drainage.

• Garden paths and low-traffic surfaces.

• Infill within permeable systems.

Not Suitable For

• Structural sub-bases.

• Heavy vehicular traffic areas without restraint.

• Concrete production.

• Applications requiring tight compaction.

• Areas needing uniform decorative colour.

Application Suitability Reference

Material Compatibility

Pea Shingles 20mm is compatible with a range of common construction and landscaping materials. Its rounded shape and free-draining behaviour allow it to perform reliably when used alongside drainage and containment components.

The material does not chemically react with adjacent elements and maintains performance when correctly specified within a compatible system.

• Pipes: Suitable around plastic, clay, and concrete drainage pipes where water movement is required.

• Geotextiles: Compatible with separation and filtration membranes to limit fines migration.

• Permeable Systems: Performs as a drainage or infill layer within permeable build-ups.

• Edging and Restraints: Works effectively when laterally restrained to limit surface movement.

Compatibility is dependent on project specification and overall system design rather than the aggregate alone.

Trade Supermarket - UK Supply and Hire Platform

Trade Supermarket is a UK-based platform supplying plant hire, aggregates, and building materials for a wide range of project types nationwide. Products and services are structured in line with recognised UK classifications and standard supply and hire practices.

What Sets Trade Supermarket Apart

• Unified Platform Structure: Hire services, aggregates, and building materials are supplied through a single operational framework rather than separate merchant systems.

• Classification-Led Organisation: Products are presented using recognised UK grading, classification, and typical use categories to support correct selection.

• Defined Supply Scope: The platform focuses on material supply and equipment hire only, with design, specification, and installation remaining outside the scope of service.

• Use-Case Neutral Positioning: Products support domestic, commercial, and infrastructure projects without retail-led assumptions.

• Consistent Operational Standards: The same structural and procedural standards are applied across all product categories.

Supply and Delivery Responsibility

• Material Variation: Aggregates are natural or recycled materials and variation in colour, shape, and composition can occur between sources and deliveries.

• Quantity and Coverage: Materials are supplied by weight or volume as ordered. Coverage, yield, and performance are influenced by application method and ground conditions.

• Delivery and Site Access: Delivery requires suitable access for the selected vehicle type. Clear access, adequate space, and stable ground conditions must be available at the delivery location.

• Offloading Conditions: Materials are offloaded at ground level only. Placement, spreading, or installation services are not included as part of supply.

• Returns and Surplus Material: Bulk aggregates are non-returnable once delivered. Customers should ensure quantities are calculated accurately before placing an order.

• Supply Scope: Supply is limited to the provision of materials only. Product selection, suitability assessment, and installation remain the responsibility of the buyer or appointed contractor.