Pea Shingles 40mm (Gravels)

Pea Shingles 40mm is a natural gravel consisting of rounded to sub-rounded stones. It is screened to a coarse 40mm grading, typically within a 20-40mm size range depending on source.

The large rounded particles create significant void space between stones. This allows rapid water movement while forming a stable, non-binding layer when confined.

It is used across domestic, commercial, and civil environments. Typical applications include soakaways, drainage trenches, foundation drainage, and bulk drainage layers where maximum permeability is required.

Drainage Function and Material Context

Coarse rounded gravels are selected where drainage performance is prioritised over compaction. The larger particle size increases void ratio and reduces water retention within the layer.

Pea Shingles 40mm is used where fast water dispersal and storage capacity are required beneath or around structures. It is not intended to compact into a dense or load-bearing layer.

Material selection depends on drainage design, depth of installation, and whether structural restraint is provided.

Grading and Material Classification

This product is supplied as a natural rounded gravel aggregate. The grading focuses on permeability and void formation rather than surface finish or compaction. It is suitable for drainage-focused and non-structural applications.

• Nominal 40mm rounded grading.

• Washed material with low fines content.

• Natural stone composition with mixed colour tones.

Compaction and Structural Behaviour

Pea Shingles 40mm does not compact into a bound layer. It settles under placement to form a stable but open structure when laterally restrained. The rounded stones allow movement without structural interlock.

• Rounded particles provide minimal interlock.

• Suitable for deep or confined drainage layers.

• Not designed for surface trafficking or load-bearing use.

Drainage and Water Interaction

The aggregate provides very high permeability due to large inter-particle voids. This supports rapid water movement and temporary storage within the layer. Performance is maintained when protected from fines ingress.

• High void ratio supports rapid drainage.

• Reduces hydrostatic pressure build-up.

• Suitable for soakaways and attenuation layers.

How It Compares to Smaller Pea Shingle Sizes

Pea Shingles 40mm provides greater drainage capacity than 10mm or 20mm pea shingle. The larger stone size increases void space but reduces surface smoothness. Smaller sizes provide improved surface comfort and stability but lower permeability.

• 40mm prioritises drainage and void space.

• 20mm balances drainage and surface stability.

• 10mm provides smoother surface finish.

Material Compatibility

Pea Shingles 40mm is compatible with common drainage and containment components used in civil and groundworks applications. Its rounded, inert nature allows reliable performance within multi-material systems.

• Pipes: Compatible with plastic, clay, and concrete drainage pipes where free water movement is required.

• Geotextiles: Suitable alongside separation and filtration membranes to limit fines migration.

• Soakaway Crates: Performs as infill or surround material supporting water dispersal.

• Drainage Systems: Compatible with attenuation layers, French drains, and infiltration systems.

Compatibility is governed by overall system design and specification rather than the aggregate alone.

Suitability and Usage Limitations

Suitable For

• Soakaways and attenuation systems.

• Deep drainage and infiltration layers.

• Foundation and perimeter drainage.

• French drains and trench drainage.

• Civil drainage applications requiring high void ratio.

Not Suitable For

• Structural sub-bases.

• Surface finishes or trafficked areas.

• Concrete production.

• Pipe bedding requiring close particle contact.

• Decorative landscaping requiring fine finish.

Application Suitability Reference

Why 40mm Pea Shingle Is Used for Deep Drainage

Pea Shingles 40mm is selected for deep drainage applications because the larger rounded stones create a high void ratio within the aggregate layer. This allows water to move freely and be temporarily stored within the structure without restricting flow.

The coarse grading reduces water retention and limits hydrostatic pressure build-up. This makes the material suitable for soakaways, attenuation layers, and deep trench drainage where permeability is prioritised over compaction or surface finish.

Pea Shingle 40mm vs Clean Crushed Stone 40mm

Pea Shingle 40mm and clean crushed stone 40mm serve different functional roles despite similar particle size. The key difference lies in particle shape and resulting behaviour.

Pea Shingle 40mm consists of rounded stones that promote drainage and void formation. Clean crushed stone 40mm has angular particles that provide greater interlock and structural restraint but reduced void space.

• Pea shingle prioritises drainage and water storage.

• Crushed stone prioritises stability and load resistance.

• Rounded particles allow freer water movement.

• Angular particles limit movement under load.

Material selection depends on whether drainage performance or mechanical stability is the primary requirement.

Size-Based Differences in Pea Shingle Aggregates

Pea shingle performance varies by particle size, with each grading suited to different functional requirements. Differences in stone size affect drainage capacity, surface behaviour, and suitability for exposed or deep applications.

Size selection is determined by drainage demand, installation depth, and whether the aggregate will be exposed at surface level or confined within a drainage system.

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.